Diagnostic Trouble Code 23

Safing Sensor Battery Feed Circuit Open

Normal Operation

Battery voltage is provided at diagnostic monitor Pin 15 (Circuit 611, W/O) at all times. However, voltage at Pin 15 can be as high as 19 volts (as provided by the back-up power supply) when the ignition switch is in the ON position and the back-up power supply in the diagnostic monitor is charged up. Circuit 612 (P/O) is connected to Circuit 611 (W/O) inside the safing sensor. Therefore, the voltage at Pin 23 (Circuit 612, P/O) should be the same as the voltage at Pin 15 at all times. The diagnostic monitor compares the voltage available at Pins 15 and 23. If the voltage at Pin 23 is low, the diagnostic monitor will flash out Diagnostic Trouble Code 23 to indicate an open between these two circuits.

Possible Causes

Low voltage at Pin 23 can be caused by:

1. An open circuit in the wiring harness in either Circuit 611 (W/O) or 612 (P/O).

2. An open circuit inside the safing sensor across the W/O and P/O wires.

DIAGNOSTIC TROUBLE CODE 23

23-1 VERIFY CONDITION

• Turn key to ON.

• Count diagnostic trouble code.

• Is code 23 flashing?

GO to 23-2.

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.

 

23-2 CHECK SAFING SENSOR FEED/RETURN

• Deactivate system.

• Turn ignition switch from OFF to RUN.

• Wait 30 seconds.

• Measure voltage on the following pins using Pin 3 as a ground:
  • Pin 15 (Circuit 611 (W/O)),
  • Pin 23 (Circuit 612 (P/O))

• Is voltage on both these pins normal (within ± 1.5 volts)?

  NOTE: Use voltage table for the normal specification.

Yes
REPLACE diagnostic monitor. RECONNECT system. VERIFY system. REACTIVATE system.

No
GO to 23-3.

 

23-3 CHECK SENSOR CONTINUITY

• Disconnect LH B-pillar safing sensor.

• Set ohmmeter on 200 ohms scale or AUTO.

• Measure resistance across Circuit 611 (W/O) and Circuit 612 (P/O) wires on the sensor connector.

• Is the resistance less than 2 ohms?

Yes
An open exists in the harness. LOCATE and SERVICE open wire in either Circuit 611 or 612. RECONNECT system. VERIFY system. REACTIVATE system.

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

---