• | 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. |
When a cruise control function switch is activated, the body control module (BCM) detects a predetermined voltage signal. The BCM sends a serial data message to the engine control module (ECM) indicating the function that has been requested.
The ignition is ON.
• | The ECM receives an invalid cruise control switch status serial data message from the BCM. |
• | This diagnostic runs continuously. |
• | The cruise control system is disabled. |
• | The malfunction indicator lamp (MIL) will not illuminate. |
• | 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 DTC is set, refer to DTC B3794 |
⇒ | If DTC resets, replace the BCM. Clear the DTC, road test the vehicle and attempt to engage cruise. If the DTC 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