C1288

CIRCUIT DESCRIPTION
The Steering Wheel Position Sensor (SWPS) provides the Electronic Brake and Traction Control Module (EBTCM) with an analog voltage reading from 0.2 - 4.8V depending on the steering wheel angle. The EBTCM uses the analog voltage for the centering routine. The EBTCM runs a centering routine when the vehicle speed goes above 30 Km/h (18 mph). When the vehicle reaches 30 Km/h (18 mph), the EBTCM monitors the SWPS inputs (Phase A, Phase B and Analog voltage) to see if the steering wheel is moving. If the steering wheel is not moving for a set period of time then the EBTCM assumes the vehicle is going in a straight line. At this point, the EBTCM looks at the analog voltage signal and reads the voltage. This voltage, normally around 2.5V, is then considered the center position and the digital degrees also become zero at the same time. This centering routine is necessary to compensate for wear in the steering and suspension. Wear in the steering and suspension can result in a change in the relationship between the steering wheel and the front wheels. By running the centering routine, the EBTCM can compensate for these changes by changing the digital and analog center position.

CONDITIONS FOR SETTING THE DTC
The Steering Wheel Position Sensor (SWPS) analog output voltages falls outside 0.2 - 4.8V range.

ACTION TAKEN WHEN THE DTC SETS
Magnasteer 2 is disabled, Antilock Brake System/Traction Control System (ABS/TCS) remains active.
^ Messages displayed on the Driver Information Center (DIC):
- Service Vehicle Soon

DIAGNOSTIC AIDS
The following are possible causes:
^ A Steering Wheel Position Sensor (SWPS) circuit open.
^ An SWPS shorted.
Perform an inspection of the wiring and of the connectors. Failure to carefully inspect the wiring and the connectors may result in misdiagnosis. Misdiagnosis causes part replacement with reappearance of the malfunction.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
6. Checks for a short to voltage.
8. Checks for a short to ground.
10. Checks for an open.

Part 1 Of 2:

Part 2 Of 2:

DTC C1288 STEERING SENSOR CIRCUIT MALFUNCTION (WITHOUT RPO JL4)