Test Notes

NORMAL OPERATION
The air bag diagnostic monitor measures the voltage at Pins 11 Circuit 614 (GY/O) and 12 Circuit 623 (P/W) of the air bag diagnostic monitor connector. The voltage at these pins varies with charging system voltage (the expected voltages at Pins 11 and 12 are shown in the following table). If the air bag diagnostic monitor measures a voltage of 2.0 volts or less at Pins 11 Circuit 614 (GY/O) and 12 Circuit 623 (P/W), the air bag diagnostic monitor will flash out code 13 to indicate a possible short to ground on these circuits (refer to Possible Causes for additional circuits that may be shorted to ground). When flashing code 13, the air bag diagnostic monitor blows its internal thermal fuse. This disables the air bag deployment circuit. If the voltage at Pins 11 and 12 returns to normal, a diagnostic trouble code 51 will be present due to the open thermal fuse.

NOTE: Diagnostic Trouble Code 13 will flash only while the short to ground is present.


POSSIBLE CAUSES

Low Voltage At Air Bag Diagnostic Monitor Pins 11 And 12 Can Be Caused By:

1. A short to ground within the wiring harness on Circuits 614 (GY/O), 615 (GY/W), 616 (PK/BK) or 623 (P/W), causing the diagnostic voltage to drop.

2. An internal short to ground within the air bag sliding contact, causing the driver side air bag circuit(s) to be shorted to ground.

3. An internal short to ground within the LH kick panel safing rear air bag sensor and bracket, causing Circuit 614 (GY/O) or 623 (P/W) to be shorted to ground.

4. An internal short to case ground within the driver side air bag module or passenger side air bag module.