For 1990-2009 cars only
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit/System Description
The powertrain control module (PCM)/engine control module (ECM) monitors the cruise control indicator switch. When the cruise on/off switch is switched ON, the cruise control switch is closed and the signal circuit is high. When the cruise on/off switch is switched OFF, the cruise control switch is open and the signal circuit is low.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, install a scan tool and command the Cruise Control Lamp Test ON. Observe the cruise control indicator in the IPC.
| ⇒ | If the indicator is illuminated, replace the PCM/ECM. |
| ⇒ | If the indicator is not illuminated, replace the IPC. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for PCM (4.2L), ECM (5.3L) or IPC replacement, setup, and programming.
