GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • 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/System Description

The powertrain control module (PCM) 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

    •  Cruise Control Schematics
    •  Engine Controls Schematics
    •  Steering Wheel Secondary/Configurable Control Schematics

Connector End View Reference

Powertrain Control Module Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Verification

  1. Ignition ON, verify that the Cruise Lamp parameter in the instrument panel cluster (IPC) inputs reads On.
  2. ⇒If the parameter displays Off, replace the IPC.
  3. Observe the Cruise Control Active parameter in the PCM.
  4. ⇒If the parameter reads Off, replace the IPC.
    ⇒If the parameter displays On, replace the PCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PCM or IPC replacement, setup, and programming