Features and Functions

• The air bag diagnostic monitor 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.
• 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.
• 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)...
• Diagnostic trouble codes are prioritized numerically so that if two or more faults occur at the same time, the diagnostic trouble code with the highest priority will be displayed.
• After the DTC is displayed five times, the air bag indicator will illuminate continuously until the ignition switch is cycled.
• The air bag diagnostic monitor incorporates Non-Volatile Memory (NVM) to store diagnostic trouble codes and retain them indefinitely. The air bag diagnostic monitor will always flash the highest priority diagnostic trouble code stored in NVM. Diagnostic trouble codes may be cleared from the air bag diagnostic monitor after the fault conditions are serviced (see Diagnostic Trouble Code Clearing procedure for details).
• The air bag diagnostic monitor distinguishes between hard and intermittent (or repaired) fault conditions.
  • Each diagnostic trouble code number 12 - 45 represents a hard fault (a fault that is still present). Hard diagnostic trouble codes are higher priority than intermittent diagnostic trouble codes, and may not be cleared from NVM.
  • Each of these hard diagnostic trouble codes has an equivalent diagnostic trouble code which is the sum of the diagnostic trouble code number plus 40. This equivalent diagnostic trouble code will indicate that an intermittent condition exists, or that a hard condition has been repaired.
  • Only the intermittent (repaired) diagnostic trouble codes, numbers 52 - 85, may be cleared from the air bag diagnostic monitor. (See Diagnostic Trouble Code Clearing procedure.)
    Example: A Diagnostic Trouble Code 32 indicates that high resistance in the driver side air bag circuit has been, and still is, present. A DTC 72 (32 + 40) indicates that high resistance in the driver side air bag circuit existed at one time, but no longer exists due to an intermittent condition, or a repair made to the circuit.
• If a system fault exists and the Air Bag Warning Indicator is not functioning, an audible tone will be heard indicating a need for service. The tone is a series of five sets of five beeps. This DOES NOT indicate a diagnostic trouble code 55 or any other diagnostic trouble code. The Air Bag Warning Indicator must be serviced before diagnostic trouble codes can be determined.
• If a fault exists that makes unwanted air bag deployment possible, the air bag diagnostic monitor will attempt to remove deployment power by turning on a solid state switch to blow the 10A battery fuse.

   WARNING: UNDER NO CIRCUMSTANCES SUBSTITUTE ANOTHER FUSE VALUE FOR THE 10A BATTERY FUSE. ANY FUSE OTHER THAN 10A MAY CAUSE DISARMING FAILURE AND MAY RESULT IN DANGER TO THE OCCUPANTS OF THE VEHICLE. DO NOT ATTEMPT TO REPLACE THE 10A BATTERY FUSE UNTIL THE AIR BAG SYSTEM FIRST HAS BEEN DEACTIVATED (SEE DEACTIVATION PROCEDURE FOR DETAILS).

• If the 10A battery fuse has successfully been blown by the air bag diagnostic monitor, the air bag diagnostic monitor will not attempt to blow it again until the proper fault has been serviced and cleared (see Diagnostic Trouble Code Clearing procedures for details). The air bag diagnostic monitor will store both the unwanted deployment diagnostic trouble code and the loss of deployment power diagnostic trouble code. The loss of deployment power diagnostic trouble code is the highest priority.
• The air bag diagnostic monitor includes an internal backup power supply. This feature provides sufficient backup 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 backup power supply will deplete its stored energy approximately one minute after the positive battery cable 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.

• 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.