Test Notes

Normal Operation
The air bag diagnostic monitor measures the voltage at Pins 23 and 24 of the air bag diagnostic monitor connector. The voltage at these pins varies with charging system voltage (the expected voltages are shown in the chart below). If the air bag diagnostic monitor measures a voltage of less than 5 volts on either of these pins, the air bag diagnostic monitor will store in memory and flash out on the air bag indicator a DTC 14 to indicate a possible short to ground on these circuits.

At the same time the air bag diagnostic monitor begins flashing out DTC 14, it attempts to disarm the air bag system to prevent inadvertent deployment of the air bag(s) by blowing the 10A battery fuse feeding air bag diagnostic monitor's Pins 13 and 14.

The air bag diagnostic monitor attempts to blow the fuse by activating a solid state switch which shorts the battery feed at Pin 13 to sheet metal ground at the air bag diagnostic monitor's bracket.

The air bag diagnostic monitor will make up to three attempts to blow this fuse, spaced at one minute apart.
- If the air bag diagnostic monitor has blown the fuse and thus removed battery voltage at Pin 14, a DTC 12 will be stored (see DTC 12 and DTC 52 description for further details).
- If the air bag diagnostic monitor attempts to blow the 10A battery fuse three times and fails each time, a DTC 24 will be stored (see DTC 24 and DTC 64 description for further details).
- After the 10A fuse is blown or three attempts to blow it fail, the air bag diagnostic monitor will not attempt to disarm again until the DTC 13 condition has been serviced and cleared (see Diagnostic Trouble Code Clearing description for further details).
- Should the short on Pins 23 or 24 be intermittent or repaired, the air bag diagnostic monitor will flash out a DTC 54 (or a higher priority DTC such as DTC 12 if one exists) on the next ignition switch cycle.

Possible Causes

WARNING: Servicing a DTC 14 will usually occur after servicing of a DTC 12 has been completed. 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 unless the air bag system first has been deactivated (see deactivation procedure for details).

Low voltage at diagnostic monitor Pins 23 or 24 can be caused by:
- A short to ground on Circuits 617 (PK/O), 619 (PK/W), 624 (Y/W), or 625 (Y/LG) causing the diagnostic voltage to drop.
- An internal short to case ground within either of the radiator primary crash sensors.