C1282

CIRCUIT DESCRIPTION
The yaw rate bias is calculated by the Electronic Brake and Traction Control Module (EBTCM) any time ignition is present. This value is used to compensate for offsets in the yaw rate sensor output due to temperature changes and manufacturing differences.

CONDITIONS FOR SETTING THE DTC
^ Diagnostic Trouble Code (DTC) C1282 can be set any time ignition is present and the yaw rate bias exceeds 7 degrees/seconds.
^ DTC C1282 can be set if the measured yaw rate changes by more than 390 degrees/second within one second.
^ DTC C1282 can be set if the signal voltage is less than 0. 15 volts or greater than 4.85 volts.
^ DTC C1282 can be set during an Active Handling event. The Electronic Brake and Traction Control Module (EBTCM) does a comparison between the actual yaw rate and a yaw rate derived from the difference in output from the front wheel speed sensors during an understeer condition or the rear wheel speed sensors during an oversteer condition. If this yaw rate difference is greater than 10 degrees/seconds for more than 60 seconds DTC C1282 will be set.

ACTION TAKEN WHEN THE DTC SETS
Antilock Brake System (ABS) and Traction Control System (TCS) remain enabled, Active Handling is disabled.
^ Indicators that turn on:
- Car Icon (TCS indicator)
^ Messages displayed on the Driver Information Center (DIC):
- Service Active HNDLG

CONDITIONS FOR CLEARING THE DTC
^ Condition for Diagnostic Trouble Code (DTC) is no longer present and Scan tool clear DTC function is used.
^ Fifty ignition cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
^ It is very important to check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a flat surface.
^ When performing the following diagnostic procedure, insure that the vehicle is parked on a level surface.
^ It is very important to find out from the driver when the code was set, (when the SERVICE ACTIVE HNDLG message was activated). This information may help to duplicate the failure.
^ It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
^ It is very important to properly check the 5 volt power supply to the Yaw Rate Sensor. The Yaw Rate Sensor must have at least 4.75 volts, if the Yaw Rate Sensor does not have a stable (not drifting) supply voltage of at least 4.75 volts then Diagnostic Trouble Code (DTC) C1282 will set.
^ An intermittent malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation. Refer to Testing for Electrical Intermittents in Diagnostic Aids.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
24. This step checks for the Electronic Brake and Traction Control Module (EBTCM) pull up voltage.
25. This step checks for the proper Yaw Rate Sensor signal being sent to the EBTCM.
26. This step checks if the EBTCM can properly interpret the Yaw Rate Sensor signal.

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DTC C1282 YAW RATE SENSOR BIAS CIRCUIT MALFUNCTION