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Circuit/System Testing

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Lane Departure Warning Switch Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Test for less than 10 ohms between the ground circuit terminal 8 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Mode Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 9 for a short to ground. If the circuit tests normal, replace the VDAAW module.
  4. Install 3A fused jumper wire between the signal circuit terminal 9 and ground. Verify the scan tool Mode Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the VDAAW module.
  5. If all circuits test normal, test or replace the headlamp switch.

Lane Departure Warning Switch LED Circuit Malfunction

  1. Ignition ON, observe the scan tool Mode LED parameter while cycling the lane departure warning switch. The parameter should change between On and Off.
    • If the parameter does not change between the specified values, replace the VDAAW module.
  2. Observe the mode LED while cycling the lane departure warning switch. The LED should turn ON and OFF when cycling between the commanded states.
    • If the LED is always OFF, test the control circuit terminal 16 at the headlamp switch harness connector for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, test or replace the headlamp switch.
  3. If all circuits test normal, replace the VDAAW module.
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