Test Notes

NORMAL OPERATION
The air bag diagnostic monitor measures the voltage at Pin C2-11, Circuit 8 (W/BL) and Pin C2-12, Circuit 9 (BR/W) of the air bag diagnostic monitor connector. The voltage at these pins varies with charging system voltage. (The expected voltages at Pins C1-11 and C2-12 are shown in the table provided.) If the air bag diagnostic monitor measures a voltage of 2.0 volts or less at Pin C1-11, Circuit 8 (W/BL) and Pin C2-12, Circuit 9 (BR/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.) Before 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 C2-11 and C2-12 returns to normal, a Diagnostic Trouble Code 51 will be present due to the open thermal fuse (refer to DTC 51 : Air Bag Diagnostic Monitor Internal Thermal Fuse Blown).

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

Charging System Voltage:

POSSIBLE CAUSES
Low voltage at air bag diagnostic monitor Pins C1-11 and C2-12 can be caused by:

1. A short to ground within the wiring harness on Circuits 8 (W/P), 8 (W/BL), 29 (O), 29 (O/BL), 29 (O/W), 31S (BK/O), 31S (BK/W) or 9 (BR/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 RH kick panel [1][2]safing sensor and bracket, causing either Circuit 29 (O/BL) or Circuit 9 (BR/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.