DTC 22: Safing Sensor Shorted or Stuck Closed

Electrical Schematic:

Pin 11 And 12 Voltage Chart:

Normal Operation
The 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 diagnostic monitor (along with the resistors inside the crash sensors-refer to DTC 24 for more information). This voltage varies with charging system voltage (the expected voltage at Pins 11 and 12 are shown in the chart provided). If the voltage at both of these pins exceeds 5 volts, the diagnostic monitor will flash out Diagnostic Trouble 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 safing sensor and clockspring carries higher voltage circuits that may short to Circuits 614 and 623.

2. A short in the clockspring between Circuit 614 and some of the horn or speed control wiring.
3. A short across the normally open contacts of the safing sensor.

NOTE: The voltage at Circuits 611 and 612 inside the 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 and 623 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 Diagnostic Trouble Code 22 to occur.

Pinpoint Test Steps:

22-1 - 22-4: