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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac Torrent and 2007 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn OFF the ignition.
  2. Disconnect the ambient light sensor.
  3. Turn ON the ignition.
  4. Install a scan tool and display the Ambient Light Sensor parameter in the BCM data list.
    • If the scan tool parameter is less than 7 volts, locate and repair an open, high resistance or short to ground in the ambient light sensor signal circuit or replace the ambient light sensor.
    • If the scan tool parameter is greater than 10.5 volts, locate and repair a short to voltage in the ambient light sensor signal circuit.
  5. If circuits test OK, replace the BCM.
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