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Home >> Pontiac >> 2007 >> Grand Prix Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 67 (Cruise Control System) >> Diagnostic Information and Procedures >> Cruise Control Inoperative/Malfunctioning >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Buick LaCrosse and 2007 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Repair any brake system related symptoms and DTCs before performing this diagnostic.
CAUTION: Refer to SIR Caution .

Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling .

  1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
  2. Disconnect the harness connector of the cruise control switch.
  3. Ignition ON, verify that a test lamp illuminates between the steering wheel control supply voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the cruise control supply voltage circuit for an open/high resistance or a short to ground.
  4. Ignition OFF, disconnect the harness connector C3 of the BCM.
  5. Ignition ON, verify that a test lamp does not illuminate at the harness connector of the BCM C3 between the cruise cancel switch signal circuit terminal 6 and ground.
    • If the test lamp illuminates, test the cruise cancel switch signal circuit for a short to voltage.
  6. Ignition OFF, install a fused jumper at the harness connector of the cruise control switch between the steering wheel control supply voltage circuit terminal 1 and the cruise cancel switch signal circuit terminal 5.
  7. Ignition ON, verify that a test lamp illuminates at the harness connector of the BCM C3 between the cruise cancel switch signal circuit terminal 6 and ground.
    • If the test lamp does not illuminate, test the cruise cancel switch signal circuit for an open/high resistance, or a short to ground.
  8. Ignition OFF, connect the harness connector C3 at the BCM. Disconnect the harness connector C1 at the PCM (3.8L) / C2 at the ECM (3.6L).
  9. Connect the fused jumper at the harness connector of the cruise control switch between the steering wheel control supply voltage circuit terminal 1 and the cruise control switch signal circuit terminal 3.
  10. Ignition ON, connect a test lamp at the harness connector of the PCM/ECM between the cruise control switch signal circuit terminal 44 (3.8L) or terminal 59 (3.6L) and ground.
    • If the test lamp illuminates, test the cruise control switch signal circuit for a short to voltage.
    • If the test lamp does not illuminate, test the cruise control switch signal circuit for an open/high resistance, or a short to ground.
  11. If the circuits test normal, test the component. If the component tests normal, replace the PCM/ECM.
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