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Home >> Pontiac >> 2007 >> Solstice Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 166 (Lighting System) >> Diagnostic Information and Procedures >> Headlamps Malfunction >> Circuit/System Testing >> Turn Signal/Multifunction Switch Malfunction
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Turn Signal/Multifunction Switch Malfunction

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 and X2 harness connectors at the turn signal/multifunction switch.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 1.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal B.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify the scan tool Headlamp On Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 2 for short to ground. If the circuit tests normal, replace the BCM.
  5. Verify the scan tool Headlamp Off Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 4 for short to ground. If the circuit tests normal, replace the BCM.
  6. Verify the scan tool Flash to Pass Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM.
  7. Verify the scan tool High Beam Select Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM.
  8. Verify the scan tool Low Beam Relay Command parameter is Off.
    • If not the specified value, test the signal circuit terminal F for a short to voltage. If the circuit tests normal, replace the BCM.
  9. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool Headlamp On Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  10. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Headlamp Off Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. Install a 3 A fused jumper wire between the signal circuit terminal C and ground. Verify the scan tool Flash to Pass Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  12. Install a 3 A fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool High Beam Select Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  13. Install a 10 A fused jumper wire between the signal circuit terminal F and ground. Verify the scan tool Low Beam Relay Command parameter is On.
    • If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  14. If all circuits test normal, test or replace the turn signal/multifunction switch.
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