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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 >> DTC B3600 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Ignition OFF, verify a test lamp illuminates between B+ and the ground circuit terminal 8
    • If less test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ between the B+ circuit terminal 15 and ground.
    • If less than the specified range, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool Dimming Control Signal parameter is less than 0.2 volts.
    • If greater than the specified range, test the signal circuit terminal 13 for a short to voltage. If the circuit tests normal, replace the BCM.
  5. Install a 3A fused jumper wire between the signal circuit terminal 13 and the B+ circuit terminal 15. Verify the scan tool Dimming Control Signal parameter is greater than 2.5 volts.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, test or replace the headlamp switch.
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