C1285

Circuit Description
The Vehicle Stability Enhancement System (VSES) uses the lateral accelerometer input when calculating the desired yaw rate. The usable output voltage range for the lateral accelerometer is 0.25 - 4.75 volts. The scan tool will report zero lateral acceleration as 2.5 volts with no sensor bias present.
The lateral accelerometer sensor bias compensates for sensor mounting alignment errors and electronic signal errors.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
The lateral accelerometer input voltage is less than 0.15 volts or greater than 4.85 volts for 1 second.

Action Taken When the DTC Sets
^ The EBCM disables the VSES for the duration of the ignition cycle.
^ The DIC displays the SERVICE STABILITY SYSTEM message.
^ The ABS/TCS remains functional.

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function.
^ The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
During diagnosis, park the vehicle on a level surface. Check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a level surface. Find out from the driver under what conditions the DTC was set (when the DIC displayed the SERVICE STABILITY SYSTEM message). This information will help to duplicate the failure. The Snapshot function on the scan tool can help find an intermittent DTC.

Test Description
The number below refers to the step number on the diagnostic table.
3. Tests for the proper operation of the circuit in the low voltage range.
4. Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
5. Tests for a short to voltage in the 5 volt reference circuit.
6. Tests for a high resistance or an open in the ground circuit.