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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Chevrolet Monte Carlo and 2007 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clear the DTC. Disconnect the headlamp switch.
  2. Connect a DMM between the I/P dimming voltage reference circuit and the negative terminal of the battery.
  3. Ignition ON, test for 9-14 volts.
    • If less than 9 volts, test the I/P dimming voltage reference circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the BCM.
    • If greater than 14 volts test the I/P dimming voltage reference circuit for a short to voltage. If the circuit/connections test normal, replace the BCM.
  4. If the voltage is correct and all circuits/connections test normal, replace the headlamp switch.
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