C1288

DTC C1288: Steering Sensor Circuit Malfunction (Part 1 Of 3):

DTC C1288: Steering Sensor Circuit Malfunction (Part 2 Of 3):

DTC C1288: Steering Sensor Circuit Malfunction (Part 3 Of 3):

DTC C1288 Schematic:

CIRCUIT DESCRIPTION
The Steering Wheel Position Sensor produces a digital output with a resolution of one degree of rotation. The signal is output on two lines, and is a combination of low and high pulses. By interpreting the relationship of the low and high pulses, the EBTCM can determine the direction of the steering wheel rotation.

CONDITION FOR SETTING THE DTC
DTC C1288 can be set any time the vehicle speed is greater than 8 km/h (5 mph). A fault exists if the vehicle yaw rate, as measured by the Yaw Rate Sensor, is large enough to cause Stabilitrak(D to be activated and there have been no pulses from the digital steering sensor indicating movement for a period of 20 seconds prior to a Stabilitrak event and 0.5 second after a Stabilitrak event. An open in circuit 1763 or 1764 will set DTC C1288.

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 DIC.

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
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, ensure that the vehicle is parked on a level surface. It is important to find out from the driver when the code was set, (when the STABILITY REDUCED message was activated) and what was he doing at the time. This information will 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. An intermittent malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
3. Check for a short to B+ in CKT 1763.
5. Check for a short to B+ in CKT 1764.
7. Check for a short to ground in CKT 1763.
9. Check for a short to ground in CKT 1764.
11. Check for a short between CKT 1763 and CKT 1764.
13. Check for an open in CKT 1763.
15. Check for an open in CKT 1764.
17. Check the Steering Wheel Position Sensor.