22: Center Cowl Safing Sensor Output Circuit Shorted to B+

DIAGNOSTIC TROUBLE CODE 22

Center Cowl Safing Sensor Output Circuit Shorted to Battery Voltage

Normal Operation

Charging System Voltage Chart:

The air bag diagnostic monitor measures voltage at Pins 11 (Circuit 614, GY/O) and 12 (Circuit 623, P/W). The voltage at these pins is controlled by two resistors inside the air bag diagnostic monitor and the voltage varies with charging system voltage (the expected voltages at Pins 11 and 12 are shown in the Charging System Voltage Chart). If the voltage at both of these pins exceeds 5 volts, the air bag diagnostic monitor will flash out code 22.

Possible Causes
High voltage at Pins 11 and 12 can be caused by:
1. A short in the wiring harness between Circuits 614 (GY/O) or 623 (P/W) and another wire can cause high voltage on these circuits.

NOTE: The wiring harness leading to the center cowl safing sensor carries higher voltage circuits that may short to Circuits 614 (GY/O) and 623 (P/W).

2. A short in the air bag sliding contact between Circuit 614 (GY/O) and some of the horn or speed control wiring.
3. A short across the normally open contacts of the center cowl safing sensor.

NOTE: The voltage on Circuits 611 (W/O) and 612 (P/O) inside the center cowl safing sensor is usually battery voltage or higher. There should be an open circuit across the contacts of the safing sensor if the sensor is operating normally. If the sensor contacts are closed, the voltage on Circuits 614 (GY/O) and 623 (P/W) would be high (at least battery voltage).

4. Vehicle charging system voltage too high. If the generator output voltage is too high (greater than 17 volts) it may cause a code 22 to occur.

Electrical Schematic - Diagnostic Trouble Code 22:

Pinpoint Tests - 22-1 - 22-4: