• | 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. |
The body control module (BCM) monitors the stop lamp switch, mounted on the brake pedal. The BCM sends a serial data message to the engine control module (ECM) indicating the status of the stop lamp switch.
• | The ignition is ON. |
• | The cruise switch is ON. |
• | The ECM receives an invalid brake pedal status serial data message from the BCM. |
• | This diagnostic runs continuously. |
• | The malfunction indicator lamp (MIL) will not illuminate. |
• | The cruise control system is disabled. |
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear after 40 malfunction-free ignition cycles have occurred. |
Cruise Control Description and Operation
Control Module References for scan tool information
⇒ | If the brake system or brake lights do not operate properly, refer to DTC P0572 or P0573 . |
⇒ | If DTC P0703 is set as current, replace the BCM. Clear the DTC and road test the vehicle. If DTC P0703 resets, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM or ECM replacement, setup, and programming