C1282

DTC C1282: Yaw Rate Sensor Bias Circuit Malfunction (Part 1 Of 4):

DTC C1282: Yaw Rate Sensor Bias Circuit Malfunction (Part 2 Of 4):

DTC C1282: Yaw Rate Sensor Bias Circuit Malfunction (Part 3 Of 4):

DTC C1282: Yaw Rate Sensor Bias Circuit Malfunction (Part 4 Of 4):

DTC C1282 Schematic:

CIRCUIT DESCRIPTION
The yaw rate bias is calculated by the EBTCM any time ignition is present and the car is standing still. This value is used to compensate for offsets in the yaw rate sensor output due to temperature changes and manufacturing differences. If this bias exceeds ± 5 degrees/second or 0.196 volts then the sensor is assumed to be bad and DTC C1282 will set. The scan tool will report a zero yaw value of 2.5 volts (0 degrees/second) if no offset bias exists. 1 volt is equal to 28.44 degrees.

CONDITION FOR SETTING THE DTC
DTC C1282 can be set any time after the steering angle has been centered and the yaw sensor voltage is less than 0.15 volts (-67 degrees/second) or greater than 4.85 volts (67 degrees/second). If the measured yaw rate changes by more than 390 degrees/second within one second then DTC C1282 will set. If DTC C1281 is set then there is a mismatch between the estimated and the actual yaw rates.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS and TCS remain enabled, Stabilitrak is disabled and the STABILITY REDUCED message will be displayed on the DTC.

CONDITIONS FOR CLEARING THE DTC
Condition for DTC is no longer present and scan tool clear DTC function is used. Fifty start cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
Check the Yaw Rate Sensor is securely fastened to the package shelf. If DTC C1281 is also current, it is very important to check the vehicle for proper alignment. When performing the following diagnostic procedure, ensure that the vehicle is parked on a level surface. It is important to find out from the driver when the code was set, (i.e., when the STABILITY REDUCED 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 a misdiagnosis or cause unnecessary part replacement.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
2. Check for a short to ground in CKT 716.
4. Check for a short to ground in CKT 1337.
6. Check for a short to ground in CKT 1338.
8. Check for a short between CKT 1337 and
10. Check for a short between CKT 1337 and CKT 716.
12. Check for a short between CKT 1338 and CKT 716.
14. Check for a short to voltage in CKT 716.
16. Check for a short to voltage in CKT 1337.
18. Check for a short to voltage in CKT 1338.
20. Check for an open in CKT 716.
22. Check for an open in CKT 1338.
24. Check for an open in CKT 1337.
26. Check EBTCM Yaw Rate Sensor voltage
27. Check Yaw Rate Sensor.
30. Check Yaw Rate Sensor.