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Home >> Chevrolet >> 2012 >> Traverse LS, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Lighting System) >> Diagnostic Information and Procedures >> DTC B2740 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
  2. Ignition ON, test for greater than 10V between the 12 V reference circuit terminal 1 and ground.
    • If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  3. Test for 0.4K Ω to 1K Ω between the signal circuit terminal 12 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
  4. If all circuits test normal, test or replace the S30 headlamp switch.
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