• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Ignition | C0897 06 | C0897 06 | C0897 01 | -- |
The body control module (BCM) contains the 2-amp EPS fuse. When the ignition is ON the BCM supplies voltage to the ignition circuit to wake up the power steering control module (PSCM). The PSCM receives a serial data message from the BCM to determine the position of the ignition switch. When a power mode message is received, the PSCM monitors the ignition voltage circuit to detect if a short to voltage, short to ground, or an open exists.
Ignition ON.
The power mode message and the state of the PSCM's ignition circuit do not agree, or the PSCM's ignition circuit is shorted to voltage, ground or open
• | The driver information center (DIC) displays POWER STEERING, SERVICE TRACTION, and SERVICE ESC warning messages. |
• | Stability Control indicator illuminates, |
• | Security indicator illuminates. |
• | When the condition is no longer present. |
• | A history DTC will clear after 100 consecutive malfunction-free ignition cycles. |
Power Steering System Description and Operation
Control Module References for scan tool information
⇒ | If either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
⇒ | If the test lamp illuminates, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or and open/high resistance. If the circuit tests normal, replace the BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |