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Home >> Chevrolet >> 2017 >> Traverse LS Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B2645: Ambient Light Sensor Circuit Threshold >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the ambient light sensor.
  2. Ignition OFF, scan tool disconnected, ALL doors closed, test for less than 10 Ω between the ground circuit terminal listed below and ground.
    • Terminal B (with C67)
    • Terminal C (with CJ2)
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Ambient Light Sensor parameter is greater than 4.65 volts.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal and the ground circuit terminal listed below. Verify the scan tool Ambient Light Sensor parameter is less than 0.196 V.
    • Terminal A and terminal B (with C67)
    • Terminal D and terminal C (with CJ2)
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the ambient light sensor.
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