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Home >> GMC >> 2011 >> Acadia SL, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System >> Diagnostic Information and Procedures >> Daytime Running Lamps Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the appropriate DRL relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the DRL relay.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  6. Command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
  8. Disconnect the harness connector at the appropriate daytime running light.
  9. Verify that a test lamp illuminates between the DRL control circuit listed below and ground:
    • RPO W49/Z88 - terminal 1
    • RPO WDA - terminal 2
    • RPO WDA/X88 - terminal B
    • RPO Z88 - terminal A
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance.
  10. Verify that a test lamp illuminates between the DRL ground circuit listed below and B+:
    • RPO WDA - terminal 1
    • RPO W49/Z88 - terminal 3
    • RPO WDA/X88 - terminal A
    • RPO Z88 - terminal B
    • If the test lamp does not illuminate, test the ground circuit for a open/high resistance.
  11. If all circuits test normal, test or replace the DRL relay.
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