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Stop Lamps Circuit Test

WARNING: This page is about a different car, the 2006 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the (C4) harness connector at the BCM.
  2. Ignition ON, verify a test lamp illuminates between the following B+ terminals and ground.
    • B+ terminal 1
    • B+ terminal 2
    • B+ terminal 4
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the circuit fuse is open, test the B+ circuit and the respective stop lamp circuits for a short to ground.
  3. Ignition OFF, disconnect the harness connector at the brake pedal position sensor.
  4. Verify that a test lamp illuminates between the low reference circuit terminal C and B+.
    • If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Ignition OFF, disconnect harness connector at the inoperative stop/turn lamp.
  6. Ignition OFF, test for less than 5.0 ohms of resistance between the ground circuit terminal G and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect a test lamp between the supply voltage circuit terminal A and ground.
  8. Ignition ON, command the appropriate BCM LR or RR Turn Signal ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  9. If all circuits test normal, replace the inoperative stop/turn signal lamp assembly.
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