Circuit Description
The rear steering gear motor is a 3 phase DC motor. It has 3 hall effect switches inside the motor assembly . The rear wheel steering control module monitors the hall switches for proper switch position , and will shut down the system if a invalid switch combination is detected. A DTC C0527 will set at that time.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0527 Rear Steering Motor Position Sensor Circuit
Conditions for Running the DTC
The ignition must be ON with the engine ON.
Conditions for Setting the DTC
| • | When hall 1, hall 2, and hall 3 circuits have 12 volts as their output, simultaneously, the rear steering motor is not in a recognized, valid position by the rear wheel steering module. |
| • | When hall 1, hall 2, and hall 3 circuits have 0 volts as their output, simultaneously, the rear steering motor is not in a recognized, valid position by the rear wheel steering module. |
| • | The hall sensor supply circuit is open. |
| • | The hall sensor ground circuit is open. |
Action Taken When the DTC Sets
| • | The Service 4 Wheel Steer indicator in instrument panel cluster (IPC) will be displayed. |
| • | The code is displayed on the scan tool as DTC C0527. |
| • | The output command to the motor is zeroed and the motor drive circuits are disabled using commands from the rear wheel steering control module to open the motor shorting relay. |
| • | The rear wheels will be returned to the centered position. |
Conditions for Clearing the DTC
| • | Conditions for the DTC are not present. |
| • | The module receives a clear code command from the scan tool. |
| • | The history DTC clears after 100 malfunction-free ignition cycles. |
Diagnostic Aids
If the wiring harness to the steering gear motor is damaged in any way , it MUST be replaced . You can only service the connectors and terminals.
Use a scan tool to monitor the outputs of the hall-affect sensor 12-volt reference circuit. If the voltage of this circuit does not measure between 11.75-12.00 volts, inspect the harness connector of the rear wheel steering control module. Inspect the harness connector for intermittent or poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step helps the technician determine if the fault is current.
-
This step determines if the DTC is the result of an intermittent connection at the control module.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Rear Wheel Steering Schematics Connector End View Reference: Rear Wheel Steering Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the scan tool indicate that DTC C0527 is current? | Go to Step 3 | Go to Diagnostic Aids | |
Inspect for poor connections at the harness connector of the rear wheel steering control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 4 | |
4 |
Important: If the wiring harness to the steering gear motor is damaged in any way , it MUST be replaced . You can only service the connectors and terminals. Inspect for poor connections at the harness connector of the rear wheel steering control module and the steering gear motor connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 5 |
5 |
Does the DTC reset? | Go to Step 6 | Go to Step 7 |
6 | Replace the rear wheel steering module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 2 | System OK |
