C0186

DTC C0186

CIRCUIT DESCRIPTION
With the vehicle at rest the lateral accelerometer voltage should be 2.5 volts. The scan tool will report lateral accelerometer as 2.5 volts. The sensor bias compensates for electronic signal errors, temperature changes, manufacturing differences and monitoring differences.

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- The vehicle speed is greater than 5 km/h (3 mph).

CONDITIONS FOR SETTING THE DTC
The lateral accelerometer input voltage is less than 1.17 volts or greater than 3.83 volts for more than 2 minutes.

ACTION TAKEN WHEN THE DTC SETS
- The code is displayed on the scan tool as DTC C0186.
- The rear wheel steering system remains functional.

CONDITIONS FOR CLEARING THE DTC
- The conditions for the DTC are not currently present.
- The rear wheel steering control module receives a clear code command from the scan tool.
- The DTC clears after 100 malfunction free ignition cycles.

DIAGNOSTIC AIDS
- Inspect for poor connections at the harness connector of the rear wheel steering control module and Lat/Yaw sensor connector. Refer to Diagnostic Aids For Circuit Testing And Wiring Repair procedures.
- Observe the rear wheel steering mode select switch. If all of the mode indicator LEDs are illuminated the rear wheel steering control module has lost its memory settings and the scan tool must be used to re-calibrate the rear wheel steering alignment data in the rear wheel steering control module. Refer to Measuring Wheel Alignment (With Rear Wheel Steering) Measuring Wheel Alignment (Without Rear Wheel Steering).
- The system can have a DTC C0186 and 4-Wheel Steering will still function normally.




LATERAL ACCLEROMETER

TEST DESCRIPTION

Steps 1-2:

Steps 5-8:

Steps 9-13:

Steps 14-15:

The numbers below refer to the step numbers on the diagnostic table.
3. Tests for the proper operation of the circuit in the high voltage range.
4. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
5. Tests for a short to ground in the 5-volt reference circuit.