Test Notes
Air Bag Or Primary Crash Sensor Circuit Shorted To GroundNORMAL OPERATION
The air bag diagnostic monitor measures the voltage at Pin 11 (Circuit 614, GY/O) of the air bag diagnostic monitor connector. The voltage at Pin 11 varies with charging system voltage (the expected voltage at Pin 11 is shown in the following table). Note that Circuit 614 (GY/O) is connected to Circuit 615 (GY/W) through the driver side air bag module and to Circuit 616 (PK/BK) through the passenger side air bag module. Also, note that Circuit 615 (GY/W) and Circuit 616 (PK/BK) are connected to the primary crash sensor feed circuits 617 (PK/O), 619 (PK/W) and 621, (W/Y) through a diode inside the air bag diagnostic monitor. If the air bag diagnostic monitor measures a voltage of 2.0 volts or less at Pin 11, the air bag diagnostic monitor will flash out diagnostic trouble code 13 to indicate a possible short to ground on this circuit ( refer to Possible Causes for additional circuits that may be shorted to ground). When flashing diagnostic trouble code 13, the air bag diagnostic monitor blows its internal thermal fuse. This disables the air bag deployment circuits. If the voltage at Pin 11 returns to normal, a diagnostic trouble code 51 will be present due to the open thermal fuse (refer to Diagnostic Trouble Code 51 as outlined).
NOTE: Diagnostic trouble code 13 will flash only while the short to ground is present.
POSSIBLE CAUSES
Low voltage at air bag diagnostic monitor Pin 11 can be caused by:
1. A short to ground within the wiring harness on Circuits 614 (GY/O), 615 (GY/W), 616 (PK/BK), 623 (P/W), 617 (PK/O) or 621 (W/Y) 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 sensor causing Circuit 614 (GY/O) or 623 (P/W) to be shorted to ground.
4. An internal short to ground within one or more of the crash sensors causing Circuits 617 (PK/O) and 621 (W/Y) to be shorted to ground.
5. An internal short to case ground within the passenger side air bag module or driver side air bag module.
NOTE: Circuits 617 (PK/O) and 621 (W/Y) are all connected together inside the air bag diagnostic monitor. Therefore, a short to ground on any of these circuits will short all of the circuits to ground.
