Mustang 1992 Air Bag Diagnostic Codes and Debug Information.
Use the information at your own risk.
There is no claim to accuracy.
Prolog:
Error code 32 is the most common air bag problem.
Chances are it's a bad clock spring. Very easy to replace.
Get a NEW one from Ford. They are not that expensive (less than $50?).
Do NOT waste your time or money getting a used one from the
junk yard that may break soon.
The clock spring connects the turning steering wheel to your
stationary steering column. So, over time, they have a tendency to break.
To replace: just disconnect the battery, yank the air bag, replace
the clock spring, put it back together. Get a NEW clock spring from
Ford. I think they are still under $50. To remove the air bag,
See (opens in a new windows):
http://www.veryuseful.com/mustang/tech/airBag/airBag95.html#DriversBagRR
and
http://www.veryuseful.com/mustang/tech/airBag/images/airBagStWheel95.jpg
The 1992 Mustang air bag system is very similar to the 95+ systems.
Also see the 1995 diagnostic page.
1992 Mustang Air Bag Schematic
1992 Mustang Air Bag Schematic for Code 52
Detailed steps for the debug of codes:
Code 32
Code 51
Code 52
Mustang 1992 Air Bag Diagnostic Code Table
Location of Air Bag System Components
-
LH Front Crash Sensor--Behind LH headlamp
-
RH Front Crash Sensor--Behind RH headlamp
-
LH B-pillar Safing Sensor--LH B-pillar behind trim panel
-
Center Front Sensor--Center radiator support
-
Driver Air Bag--Steering wheel
-
Clockspring--Behind steering wheel
-
Diagnostic Monitor--In center console behind climate controls
AIR BAG DIAGNOSTIC MONITOR DIAGNOSTIC TROUBLE CODE
+-----------------------+-----------------------------------------------------------------+-----------------------+
| Code | Description | Pinpoint Test |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| No Indicator | Inoperative air bag indicator circuit | A |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| Continuous Indicator | Diagnostic monitor disconnected or inoperative | B |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 12 | Loss of battery power to air bag firing circuit | C |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 13 | Front crash sensor or air bag circuit shorted to ground | D |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 21 | LH B-Pillar safing sensor not mounted to vehicle properly | E |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 22 | Safing sensor shorted or stuck closed | F |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 23 | Open connection in safing sensor feed circuit | G |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 24 | Safing sensor diagnostic circuit open | H |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 31 | All system air bag(s) open | I |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 32 | High resistance or open circuit in driver air bag circuit | J |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 33 | High resistance or open circuit in passenger air bag circuit | K |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 34 | Low resistance in driver air bag circuit | L |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 41 | Open connection in forward crash sensor circuit | M |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 44 | RH front crash sensor not mounted to vehicle properly | N |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 45 | Center front sensor not mounted to vehicle properly | O |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 46 | LH front crash sensor not mounted to vehicle properly | P |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 51 | Diagnostic monitor internal thermal fuse open | Q |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 52 | Backup power supply fault | R |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 53 | Diagnostic monitor internal fault | S |
|-----------------------+-----------------------------------------------------------------+-----------------------|
| 99(1) | All crash sensors disconnected | T |
|-----------------------+-----------------------------------------------------------------+-----------------------+
(1) - Air bag indicator flashing very fast continuously.
The 1992 Mustang air bag system is very similar to the 95+ systems. Some codes may have
*slightly* different meanings. First see the 1995 diagnostic page.
DIAGNOSIS AND TESTING
The diagnostic monitor is responsible for monitoring the air bag system components and connections. A fault code will be displayed when the ignition switch is in the RUN position and the diagnostic monitor detects a system fault. Certain faults may not be displayed until approximately 30 seconds after the ignition has been switched to the RUN position. This is the amount of time required for the diagnostic monitor to test and verify any and all system faults. The codes are produced by a series of air bag indicator flashes. The fault codes are represented by a two digit decimal number. The two digit fault code will be displayed in the following manner: Flash tens digit, one second pause, flash ones digit, three second pause, repeat cycle. For example, a fault code 32 will be displayed according to:
flash flash flash, one second pause, flash flash, three second pause,
flash flash flash, one second pause, flash flash, three second pause . . .
The coded fault feature is prioritized so that if two or more different faults occur at the same time, the highest priority fault indication will be shown until corrected. The fault codes and their associated priorities are listed in the «Fault Code Priority Table» The codes are ranked from top to bottom with the fault at the top of the list having the highest priority and the fault at the bottom of the list having the lowest priority. This listing is for information only and should not be used for system diagnosis or troubleshooting. The following deactivation procedure and diagnostic charts should be used to safely diagnose and service the system.
NOTE:
If a system fault exists and the indicator is malfunctioning, an audible tone will be heard indicating the need for service. The tone produced is a series of five sets of five beeps. The number of beeps does not indicate the fault code, it means the indicator is out and a fault is present.
Diagnostic Procedures
Rotunda Air Bag Simulator 105-00008 or equivalent is required to perform diagnosis and testing of the air bag system. The air bag simulator is a 1 ohm resistor used to simulate an air bag connection to the system. It is not acceptable to jump out the air bag connection with a zero ohm jumper wire. If a zero ohm jumper wire is used to jumper out the air bag connection, a system fault will be displayed (Fault Code 34 or 35) according to the priority scheme.
Deactivation Procedure
1. Disconnect positive battery cable.
2. Wait one minute. This is the time required for backup power supply in diagnostic monitor to deplete its stored energy.
3. Remove four nut and washer assemblies retaining driver air bag module to steering wheel. Disconnect driver air bag connector. Connect Rotunda Air Bag Simulator 105-00008 or equivalent to vehicle harness at top of steering wheel.
4. Connect positive battery cable.
Reactivation Procedure
1. Disconnect positive battery cable.
2. Wait one minute for backup power supply to deplete stored energy.
3. Remove air bag simulator from vehicle harness connector at top of steering column. Reconnect driver air bag connector. Position driver air bag on steering wheel and secure with four nut and washer assemblies (10 mm). Tighten nut and washer assemblies to 2.7-3.7 N-m (24-33 lb-in).
4. Connect positive battery cable.
5. Prove-out system.
WARNING:
THE AIR BAG SIMULATOR MUST BE REMOVED AND THE AIR BAG RECONNECTED WHEN THE SYSTEM IS REACTIVATED.
Deactivation Procedure
-
Disconnect battery ground cable (14301).
-
WARNING: THE BACK-UP POWER SUPPLY ENERGY MUST BE DEPLETED BEFORE
ANY AIR BAG COMPONENT SERVICE IS PERFORMED. TO DEPLETE BACK-UP POWER
SUPPLY ENERGY, DISCONNECT THE NEGATIVE BATTERY CABLE AND WAIT ONE
MINUTE TO AVOID ACCIDENTAL DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
Wait one minute. This is the time required for back-up power supply
in air bag diagnostic monitor to deplete its stored energy.
Air Bag System Functions
o The air bag diagnostic monitor (14B056) illuminates the air bag indicator for approximately six seconds when the ignition switch (11572) is turned to RUN and then turns the air bag indicator off. This indicates that the air bag indicator is operational. If the air bag indicator does not illuminate at all, stays on continuously, or flashes at any time, then a fault has been detected by the air bag diagnostic monitor.
o Diagnostic trouble codes, if present, will begin flashing within 30 seconds after the ignition switch has been turned to RUN. This is the amount of time it takes the air bag diagnostic monitor to perform all tests and verify system faults, if present.
o Diagnostic trouble codes are displayed as a series of flashes and pauses of the air bag indicator. Diagnostic trouble codes are two-digit numbers.
Example: A DTC 32 is displayed as follows:
flash flash flash - (two second pause) -
flash flash - (five second pause)...
flash flash flash - (two second pause) -
flash flash - (five second pause)...
WARNING: THE BACK-UP POWER SUPPLY ENERGY MUST BE DEPLETED BEFORE ANY AIR BAG COMPONENT SERVICE IS PERFORMED. TO DEPLETE THE BACK-UP POWER SUPPLY ENERGY, DISCONNECT THE NEGATIVE BATTERY CABLE AND WAIT ONE MINUTE TO AVOID ACCIDENTAL DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
The air bag diagnostic monitor includes an internal back-up power supply. This feature provides sufficient back-up power to deploy the air bags in the event that the battery (10653) or battery cables are damaged in a collision before the crash sensors are activated. The back-up power supply will deplete its stored energy approximately one minute after the negative battery cable is disconnected.
The air bag diagnostic monitor incorporates an internal safing sensor. Proper mounting of the air bag diagnostic monitor and bracket assembly is critical to the function and performance of the air bag system.
The air bag diagnostic monitor and bracket assembly is non-serviceable and must be replaced as a unit in the event of failure.
Diagnostic Monitor
The diagnostic monitor contains a microprocessor that monitors the electrical system components and connections. The monitor performs a self-check of the microprocessor internal circuits and energizes the system readiness indicator during prove out and whenever a fault occurs in the system. System electrical faults can be detected and translated into coded indicator displays. If certain faults occur, the microprocessor will disable the system by opening a thermal fuse built into the monitor. If a system fault exists and the indicator is malfunctioning, an audible tone will be heard signaling the need for service.
An air bag system backup power supply is included in the diagnostic monitor to provide air bag deployment power if the battery or battery cables are damaged in an accident before the crash sensors close. The power supply will deplete its stored energy approximately one minute after the positive cable of the battery is disconnected.
WARNING:
THE BACKUP POWER SUPPLY ENERGY MUST BE DEPLETED BEFORE ANY AIR BAG COMPONENT SERVICE IS PERFORMED. TO DEPLETE THE BACKUP POWER SUPPLY ENERGY, DISCONNECT THE POSITIVE BATTERY CABLE AND WAIT ONE MINUTE.
System Readiness Indicator
The system readiness indicator will light continuously for approximately six seconds whenever the ignition switch is turned from OFF to RUN if the air bag is working properly. If an air bag system fault is present, the indicator will either fail to light, remain lit continuously or light in a flashing manner. The flashing manner may not occur until approximately 30 seconds after the ignition switch has been turned from OFF to RUN. This is the time required for the diagnostic monitor to test and verify any and all system faults. If the air bag indicator is inoperative and an air bag system fault exists, a tone will sound signaling that the air bag readiness indicator is inoperative and an air bag system fault exists.
Electrical System
The air bag system is powered directly from the battery (10653). The system can function with the ignition switch (11572) in any position, including OFF and LOCK. The system can also function when the driver seat is unoccupied. The electrical system performs three main functions:
o Detects an impact.
o Switches electric current to the igniter.
o Monitors the system to determine readiness.
The electrical system components include:
o Electronic air bag diagnostic monitor (14B056) with integrated back-up power supply and safing sensor.
o Air bag system readiness indicator.
o Wiring harness and air bag sliding contact (14A664).
o RH radiator primary crash front air bag sensor and bracket (14B004) and LH radiator primary crash front air bag sensor and bracket (14B005).
o Igniter within driver side air bag module (043B13) and passenger side air bag module (044A74).
Sensors
The sensor is an electrical switch which operates as follows:
o It reacts to impacts according to direction and force.
o It discriminates between impacts that require air bag inflation and impacts that do not require air bag inflation.
o When an impact occurs that requires air bag inflation, the sensor contacts close, completing the electrical circuit necessary for system operation.
Three sensors are mounted in the vehicle. Their locations are as follows:
o A primary crash front air bag sensor and bracket at the RH front radiator support (16138).
o A primary crash front air bag sensor and bracket at the LH front radiator support.
o A safing sensor inside the air bag diagnostic monitor.
o The safing and one of the primary crash sensors must be activated simultaneously to inflate the air bag.
The air bag system is designed to :
o Operate in frontal or front-angled collisions.
o Activate the air bags in a crash with severe frontal deceleration, more severe than hitting a parked car of similar size and weight head-on at about 45 km/h (28 mph).
o Sense the severity of the crash rather than vehicle speed, thus some frontal collisions at speeds above 45 km/h (28 mph) may not be severe enough to require air bag inflation.
The sensors in the vehicle determine if air bag inflation is required in the following manner:
1. During severe frontal deceleration caused by an impact that decelerates the vehicle in the forward direction, both a radiator primary crash sensor and a safing sensor will activate.
2. When a primary and safing sensor are closed at the same time, electrical current will flow, igniting the driver side air bag module and passenger side air bag module.
The primary sensors measure the crash severity while the safing sensor confirms the crash and is used to prevent inadvertent deployments possibly caused by a malfunction in the primary crash sensor circuits or crash sensors.
Inflator
The inflator assembly is not a serviceable item.
When the sensors close, signaling a crash, electrical current flows to the air bag inflator.
Inside the inflator, an igniter converts the electrical signal to thermal energy (heat), causing the ignition of the inflator gas generant.
This ignition reaction combusts the sodium azide/potassium nitrate gas generant in the inflator, producing nitrogen gas, which inflates the air bag.
Air Bag
The driver side air bag:
Is constructed of uncoated nylon.
Is 673 mm (26.5 inch) in diameter.
Fills completely in approximately 40 milliseconds.
A module housing and wheel attaching bracket attach and seal the air bag to the inflator.
A mounting bracket and housing are also used to attach the trim cover and to mount the entire driver side air bag module to the steering wheel.
These items are components of the driver side air bag module and cannot be serviced.
Steering Wheel Trim Cover
The steering wheel trim cover:
Encases the driver side air bag module.
Has moulded in tear seams that separate to allow inflation of the bag.
Is a component of the driver side air bag module and is not serviceable.
Must not be repainted for any reason.
Air Bag Diagnostic Monitor
The air bag diagnostic monitor (14B056) continually monitors all air bag
system components and wiring connections for possible faults when the
ignition switch (11572) is in RUN.
If the air bag diagnostic monitor detects a fault in the air bag
system, a Diagnostic Trouble Code (DTC) will be written to the air bag
diagnostic monitor's Non-Volatile Random Access Memory (NVRAM).
This diagnostic trouble code will then be displayed on the air bag
indicator lamp.
After servicing, the diagnostic trouble code may then be cleared
from NVRAM.
Performing system diagnostics is the main purpose of the air bag
diagnostic monitor.
THE air bag diagnostic monitor DOES NOT DEPLOY THE AIR BAGS IN THE
EVENT OF A COLLISION.
The crash sensors are "hard-wired" to the air bags. Thus the crash
sensors determine when the air bag will be deployed.
Several important features of the air bag diagnostic monitor and
its functions within the system are described below. It is necessary that
these key features and functions are well understood.
DTC 32: DRIVER SIDE AIR BAG CIRCUIT HIGH RESISTANCE OR OPEN
Normal Operation
While the ignition switch is in the RUN position, the air bag diagnostic
monitor runs periodic checks on the resistance of the driver and
passenger air bag circuits.
o Normal resistance from Pin 2 (Driver Air Bag Feed) to Pin 3
(Driver Air Bag Return) is between 1.4 ohms and 2.0 ohms. This resistance
total results from the sum of the components in the circuit: the air bag
module (approximately 1 ohm) and the air bag sliding contact
(0.20 ohm to 0.35 ohm per winding, 2 windings total) plus a small amount
of resistance due to the wire itself, crimps, etc.
o If the resistance across these two pins exceeds 3.5 ohms, the air
bag diagnostic monitor will interpret this as high resistance and the air
bag diagnostic monitor will store in memory and flash out on the air bag
indicator a DTC 32.
o If the high resistance is later serviced or otherwise falls into the
normal range, the next ignition switch cycle will produce a DTC 72
(or a higher priority DTC if one exists).
NOTE:
The air bag connector, air bag diagnostic monitor harness connector,
and the air bag sliding contact connector have metal spring clips that
act as shorting bars. These shorting bars are built into the plastic
hardshell connectors. The shorting bars are designed to short Circuits
614 (GY/O) and 615 (GY/W) together when the connectors are not mated.
DO NOT attempt to remove the air bag shorting bar and measure the
resistance of the air bag.
The air bag sliding contact shorting bar may be removed to measure
the air bag sliding contact resistance. Likewise, the shorting bar(s)
in the air bag diagnostic monitor harness connector may be removed by
removing the black spacer (locking wedge) from the connector. Use
extreme caution when reinstalling the shorting bars to ensure they
are installed correctly.
Possible Causes
Excessive resistance across Pins 2 and 3 can be caused by:
o A poor connection or corrosion where the air bag sliding contact
connects into the main wiring harness. The air bag sliding contact
connector at the base of the steering column may have excessive
resistance between the male and female terminals in the connector.
Also, corrosion may occur on the terminal crimps on both the air bag
sliding contact terminals and the main wiring harness terminals.
o An open circuit or high resistance in the air bag sliding contact
windings inside the air bag sliding contact.
o An open circuit or high resistance in the wiring harness in either
Circuit 614 (GY/O) or Circuit 615 (GY/W).
o An open circuit or high resistance in the driver side air bag module.
DO NOT attempt a direct resistance measurement of the air bag. Follow
the diagnostic procedure to determine if the air bag module resistance
is higher than normal.
Additional Code 51 Diagnostic Information:
(Note from Joe: I STRONGLY SUGGEST that you first Disconnect the battery for 20 mins, then
DISCONNECT THE AIR BAG before you start to diagnose the following problem.)
Remember: SAFETY FIRST!
For a wiring diagram to aid in the diagnostic, see:
Air Bag 92 Code 51 Circuit Diagram
(opens in a new window)
Fault Code 51 - Diagnostic Monitor Internal Thermal Fuse -
Open Due to Intermittent Short To Ground
Description:
NOTE: The microprocessor inside the diagnostic monitor controls the internal
thermal fuse. This fuse is not serviceable. The microprocessor will open the
thermal fuse whenever a short is detected in the deployment circuits. The
thermal fuse does NOT open because of excessive current flowing through it.
DO NOT attempt to jumper out the thermal fuse with a circuit breaker or any
other type of fuse.
NOTE: DO NOT install a new diagnostic monitor until the short has been
located and corrected. If a short to ground has not been located and corrected,
then the short to ground is intermittent and IS NOT PRESENT AT THIS TIME.
If you install a new diagnostic monitor while there is an intermittent short in the system,
the new diagnostic monitor will also open its thermal fuse and require repeat repairs.
The diagnostic monitor measures the diagnostic voltages on the monitor
connector pins. When certain air bag deployment wires are shorted to ground (heavy
lines illustrated in
Figure 114 ), the system may become unstable to unwarranted air bag deployment.
The diagnostic monitor prevents this by detecting shorts to ground on any of these
circuits and opening the thermal fuse. Opening this fuse removes all power
(battery and and backup power) from the air bag deployment circuits.
While the short to ground exits, the monitor will flash a Fault Code 13.
If the short to ground is intermittent and temporarily corrects itself,
the diagnostic monitor will flash a Fault Code 51.
Note that if the short to ground returns, the diagnostic monitor will
revert to the higher priority Fault Code 13.
If the AIR BAG readiness lamp is flashing a Fault Code 51 and
a short to ground has not been serviced, this means that an intermittent short
to ground exists in the air bag system.
The diagnostic monitor will eventually have to be replaced but only after a
visual inspection leads
to the repair of a short to ground in the
wiring harness.
The following service tips may help you to find intermittent shorts to ground:
-
Inspect wiring and harness in the areas where they pass through
or are located next to metal components (i.e. engine compartment
bulkhead, body sheet metal, component mounting brackets, etc.).
PINPOINT TEST C1: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE
51--PROBABLE FAULT--LOSS OF BATTERY POWER TO AIR BAG FIRING CIRCUIT
C1 DEACTIVATE SYSTEM
o Deactivate system.
o Disconnect diagnostic monitor.
o Measure voltage from diagnostic monitor connector Pin 13 (+)
(Circuit 937, R/W) to PIn 2 (-) (57, BK).
o Is voltage greater than 10 volts?
Yes
REPLACE diagnostic monitor. VERIFY system. REACTIVATE system.
No
GO to .
PINPOINT TEST C2: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE
51--PROBABLE FAULT--LOSS OF BATTERY POWER TO AIR BAG FIRING CIRCUIT
C2 CHECK INSTRUMENT PANEL FUSE
o Check instrument panel fuse No. 7, 15 amp.
o Is fuse open?
Yes
GO to .
No
GO to .
PINPOINT TEST C3: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE
51--PROBABLE FAULT--LOSS OF BATTERY POWER TO AIR BAG FIRING CIRCUIT
C3 CHECK FOR SHORT TO GROUND IN CIRCUIT 937 (R/W)
o Measure resistance from diagnostic monitor connector Pin 13 (Circuit
937, R/W) to ground.
o Is resistance less than 10 ohms?
Yes
LOCATE and SERVICE short to ground in Circuit 937 (R/W). REPLACE
open fuse. RECONNECT system. VERIFY system. REACTIVATE system.
No
GO to .
PINPOINT TEST C4: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE
51--PROBABLE FAULT--LOSS OF BATTERY POWER TO AIR BAG FIRING CIRCUIT
C4 CHECK FOR SHORT TO GROUND IN CIRCUIT 611 (W/O)
o Measure resistance from diagnostic monitor connector Pin 15 (Circuit
611, W/O) to ground.
o Is resistance less than 10 ohms?
Yes
GO to .
No
GO to .
PINPOINT TEST C5: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE
51--PROBABLE FAULT--LOSS OF BATTERY POWER TO AIR BAG FIRING CIRCUIT
C5 CHECK FOR SHORT TO GROUND IN LH B-PILLAR PANEL SAFING SENSOR
o Disconnect LH B-pillar safing sensor.
o Measure resistance from diagnostic monitor connector Pin 15 (Circuit
612, P/O) to ground.
o Is resistance less than 10 ohms?
Yes
LOCATE and SERVICE short to ground in Circuit 611 (W/O). REPLACE
open fuse. RECONNECT system. VERIFY system. REACTIVATE system.
No
GO to .
PINPOINT TEST C6: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE
51--PROBABLE FAULT--LOSS OF BATTERY POWER TO AIR BAG FIRING CIRCUIT
C6 CHECK FOR SHORT TO GROUND IN CIRCUIT 612 (P/O)
o Measure resistance from diagnostic monitor connector Pin 23 (Circuit
612, P/O) to ground.
o Is resistance less than 10 ohms?
Yes
LOCATE and SERVICE short to ground in Circuit 612 (P/O). REPLACE
open fuse. RECONNECT system. VERIFY system. REACTIVATE system.
No
GO to .
PINPOINT TEST C7: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE
51--PROBABLE FAULT--LOSS OF BATTERY POWER TO AIR BAG FIRING CIRCUIT
C7 VERIFY SHORT TO GROUND IN LH B-PILLAR SAFING SENSOR
o Measure resistance from LH B-pillar safing sensor connector Circuit
611 (W/O) and Circuit 612 (P/O) to ground.
o Is resistance less than 10 ohms for either circuit?
Yes
REPLACE LH B-pillar safing sensor. REPLACE open fuse. RECONNECT
system. VERIFY system. REACTIVATE system.
No
INSPECT for crossed wires at LH B-pillar safing sensor connector
and diagnostic monitor connector. SERVICE Circuit 611 (W/O)
and/or Circuit 612 (P/O). REPLACE open fuse/fusible link.
REACTIVATE system.
PINPOINT TEST C8: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE
51--PROBABLE FAULT--LOSS OF BATTERY POWER TO AIR BAG FIRING CIRCUIT
C8 CHECK FOR INTERMITTENT SHORT TO GROUND
o Replace open fuse.
o Reconnect diagnostic monitor.
o Did fuse open again?
Yes
REPLACE Diagnostic monitor. REPLACE open fuse. VERIFY system.
REACTIVATE system.
No
INSPECT intermittent short to ground in Circuits 937 (R/W), 611
(W/O) and 612 (P/O). SERVICE circuits as required. RECONNECT
system. VERIFY system. REACTIVATE system.
PINPOINT TEST C9: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE
51--PROBABLE FAULT--LOSS OF BATTERY POWER TO AIR BAG FIRING CIRCUIT
C9 CHECK FOR PROPER BATTERY VOLTAGE
o Measure voltage of vehicle battery.
o Is voltage less than 10 volts?
Yes
RECHARGE vehicle battery. RECONNECT system. VERIFY system.
REACTIVATE system.
No
LOCATE and SERVICE open in Circuit(s) 937 (R/W) and/or 38 (BK/O).
RECONNECT system. VERIFY system. REACTIVATE system.
Code 52 DIAGNOSIS AND TESTING
1992 Mustang Air Bag Schematic for Code 52
PINPOINT TEST R1: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE 52--PROBABLE FAULT--BACKUP POWER SUPPLY FAULT
R1 DEACTIVATE SYSTEM
o Deactivate system.
Deactivation Procedure
1. Disconnect positive battery cable.
2. Wait one minute. This is the time required for backup power supply in diagnostic monitor to deplete its stored energy.
3. Remove four nut and washer assemblies retaining driver air bag module to steering wheel. Disconnect driver air bag connector. Connect Rotunda Air Bag Simulator 105-00008 or equivalent to vehicle harness at top of steering wheel.
4. Connect positive battery cable.
o Disconnect diagnostic monitor.
o Measure resistance from diagnostic monitor connector Pin 15 (Circuit 611, W/O) to ground.
o Is resistance less than 1000 ohms?
Yes
GO to «R2».
No
REPLACE diagnostic monitor. VERIFY system. REACTIVATE system.
=================
PINPOINT TEST R2: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE 52--PROBABLE FAULT--BACKUP POWER SUPPLY FAULT
R2 CHECK FOR SHORT TO GROUND IN CIRCUIT 611 (W/O)
o Disconnect LH B-pillar safing sensor.
o Measure resistance from diagnostic monitor connector Pin 15 (Circuit 611, W/O) to ground.
o Is resistance less than 1000 ohms?
Yes
LOCATE and SERVICE short to ground in Circuit 611 (W/O). RECONNECT system. VERIFY system. REACTIVATE system.
No
GO to «R3».
=================
PINPOINT TEST R: FAULT INDICATION--AIR BAG INDICATOR FLASHES FAULT CODE 52--PROBABLE FAULT--BACKUP POWER SUPPLY FAULT
R3 CHECK FOR SHORT TO GROUND IN CIRCUIT 612 (P/O)
o Measure resistance from diagnostic monitor connector Pin 23 (Circuit 612, P/O) to ground.
o Is resistance less than 1000 ohms?
Yes
LOCATE and SERVICE short to ground in Circuit 612 (P/O). RECONNECT system. VERIFY system. REACTIVATE system.
No
REPLACE LH B-pillar safing sensor. RECONNECT system. VERIFY system. REACTIVATE system.
TORQUE SPECIFICATIONS
| Description |
N-m |
Lb-Ft |
| Driver Side Air Bag Module-to-Steering Wheel Screw |
10.2-13.8 |
8-10 |
| RH and LH Radiator Primary Crash Sensor Retaining Screws |
10.2-13.8 |
8-10 |
| Air Bag Sensor Mounting BracketRetaining Screws |
3.4-4.6 |
30-41 (Lb-In) |
| Air Bag Diagnostic Monitor Bracket Retaining Screws |
10.2-13.8 |
8-10 |
| Passenger Side Air Bag Module Retaining Bolts |
7-11 |
62-97 (Lb-In) |
-->
Mustang Air Bag Codes Home Page:
http://www.veryuseful.com/mustang/tech/airBag/