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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the S48C multi-function switch 1-instrument panel.
  2. Test for less than 5 Ω between the ground circuit terminal 7 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 8 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 cannot be dimmed, 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 S48C multi-function switch 1-instrument panel.
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