Diagnostic Trouble Code 22

Safing Sensor Output Circuit Shorted To Battery Voltage

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 Normal Operation, Diagnostic Trouble Code 24 for more information). This voltage varies with charging system voltage (the expected voltage at Pins 11 and 12 are shown in the chart below). 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.
   
   

   CHARGING SYSTEM VOLTAGE

   Charging System Voltage	Voltage at PIN NO. 11	Voltage at PIN NO. 12
   9.0	1.9	1.9
   9.5	2.0	2.0
   10.0	2.1	2.1
   10.5	2.2	2.2
   11.0	2.3	2.3
   11.5	2.4	2.4
   12.0	2.5	2.5
   12.5	2.6	2.6
   13.0	2.7	2.7
   13.5	2.7	2.7
   14.0	2.9	2.9
   14.5	3.0	3.0
   15.0	3.1	3.1
   15.5	3.2	3.2
   16.0	3.3	3.3

   
   

DIAGNOSTIC TROUBLE CODE 22

22-1 VERIFY CONDITION

• Turn key to ON.

• Count diagnostic trouble code.

• Is Code 22 flashing?

GO to 22-2.

No
Read the normal operation description for this diagnostic trouble code. EXAMINE the diagnostic trouble code schematic and look for areas where intermittent conditions would occur (connectors, splices, crimps, etc.)
DO NOT proceed with pinpoint test until the code is flashing!
Failure to do so will result in needless replacement of the air bag system components and repeat service.

 

22-2 MEASURE VOLTAGE

• Deactivate system.

• Turn key ON.

• Measure voltage on Circuit 614 (GY/O) Pin 11 to Pin 3 (ground).

• Is voltage measured high?

  NOTE: Use voltage table for normal voltage specifications. Voltage should be within ± 0.5 volt.

Yes
GO to 22-3.

No
REPLACE diagnostic monitor. RECONNECT system. VERIFY system. REACTIVATE system.

 

22-3 CHECK FOR WIRING SHORTS

• Turn key OFF.

• Disconnect diagnostic monitor.

• Disconnect LH B-pillar safing sensor.

• Measure resistance between diagnostic monitor harness connector Pin 15 (Circuit 611, W/O) and Pin 11 (Circuit 614, GY/O) and between Pins 23 (Circuit 612 P/O) and Pin 11 (Circuit 614, GY/O).

• Are resistance readings infinite (open)?
  
  
  
  
  

Yes
GO to 22-4.

No
LOCATE and SERVICE short circuit between Circuit 611 (W/O) or Circuit 612 (P/O) and Circuit 614 (GY/O). RECONNECT system. VERIFY system. REACTIVATE system.

 

22-4 CHECK FOR SHORT CIRCUIT IN LH B-PILLAR SAFING SENSOR

• Measure resistance between LH B-pillar safing sensor connector Circuit 611 (W/O) and 614 (GY/O).

• Is resistance infinite (open)?

Yes
LOCATE and SERVICE short to B+ on Circuits 614, 615, 616, or 623.

No
REPLACE LH B-pillar safing sensor. RECONNECT system. VERIFY system. REACTIVATE system.

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