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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

Brake Pedal Position Sensor Malfunction

  1. Ignition OFF, disconnect the harness connector at the brake pedal position sensor.
  2. Ignition ON, verify that a test lamp does not illuminate between the low reference circuit terminal C and ground.
    • If the test lamp illuminates, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the brake pedal position sensor.

Stop Lamps Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate stop lamp.
  2. Ignition OFF, exterior lamps OFF, test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
    • Left tail lamp ground terminal 3 - uplevel
    • Left stop/tail/turn signal ground terminal C - base
    • Right tail lamp ground terminal 3 - uplevel
    • Right stop/tail/turn signal ground terminal C - base
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground.
    • Left stop/turn signal control terminal 2 - uplevel
    • Left stop/turn signal control terminal A - base
    • Right stop/turn signal control terminal 2 - uplevel
    • Right stop/turn signal control terminal A - base
  4. Ignition ON, command the appropriate Stop/Turn Signal Lamp 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 control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the tail lamp assembly.

Center High Mounted Stop Lamp Malfunction

  1. Ignition OFF, disconnect the stop lamp relay.
  2. Ignition ON, headlamps ON, test for less than 1 Ω between the ground circuit terminal 86 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the stop lamp relay.
  5. Ignition OFF, disconnect the harness connector at the center high mounted stop lamp.
  6. Ignition OFF, exterior lamps OFF, test for less than 5 Ω between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the center high mounted stop lamp.
  8. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the center high mounted stop lamp is illuminated.
    • If the center high mounted stop lamp does not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the center high mounted stop lamp.
  9. Connect a test lamp between the control circuit terminal 85 and ground.
  10. Ignition ON, command the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the center high mounted stop lamp.
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