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Home >> GMC >> 2011 >> Terrain SLT, 2.4 C, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 178 (Lighting System) >> Diagnostic Information and Procedures >> DTC B096A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Terrain and 2010 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 A20 Radio/HVAC Controls.
  2. Test for less than 5 Ω between the ground circuit terminal 17 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the backlight control circuit terminal 16 and ground.
  4. Ignition ON, vary the interior lamp dimming switch from dim to full bright. The test lamp should dim and then become full bright.
    • If the test lamp is always bright, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
    • If the test lamp is always OFF, test the control circuit for open/high resistance or short to ground. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, replace the A20 Radio/HVAC Controls.
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