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Home >> Chevrolet >> 2006 >> TrailBlazer 6.0 H, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Lighting Systems) >> Diagnostic Information and Procedures >> Fog Lamp Indicator Inoperative >> Circuit/System Testing

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. Ignition OFF, disconnect the harness connector at the fog lamp switch.
  2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Verify the scan tool fog lamp switch parameter is OFF.
    • If the fog lamp switch parameter is not indicating OFF, test the signal circuit for a short to ground.
  4. Install a 3-amp fused jumper wire between the signal circuit and ground. Verify the scan tool fog lamp switch parameter is ON.
    • If the fog lamp switch parameter is not indicating ON, test the signal circuit of the fog lamp switch for a short to voltage or an open/high resistance.
  5. If all circuits test normal, test or replace the fog lamp switch.
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