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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Ambient Light/Sunload Sensor Malfunction

  1. Ignition OFF, disconnect the harness connector at the ambient light/sunload sensor.
  2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal C and ground.
    • If greater than the specific 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 V.
    • If less than the specified range, test the signal circuit terminal D 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 D and the ground circuit terminal C. Verify the scan tool Ambient Light Sensor parameter is less than 0.196 V.
    • If greater than the specified range, test the signal circuit for a short to voltage an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the ambient light/sunload sensor.

Daytime Running Lamps Malfunction

  1. Supply sufficient light to the ambient light sensor to simulate daylight conditions.
  2. Ignition ON, headlamp switch in the AUTOMATIC LIGHT position, observe the headlamps. The headlamps should not be illuminated.
    • If the headlamps are illuminated, replace the ambient light/sunload sensor.
  3. Ignition OFF, disconnect the harness connector at the appropriate headlamp.
  4. Connect a test lamp between the control circuit terminal A and the ground circuit terminal C.
  5. Command the Turn Signal 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.
  6. If all circuits test normal, test or replace the headlamp.
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