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Home >> Cadillac >> 2009 >> CTS Base, 3.6 V, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 124 (Object Detection System) >> Diagnostic Information and Procedures >> DTC B356A >> Circuit/System Testing
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Circuit/System Testing

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