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Home >> Buick >> 2012 >> Regal Turbo, Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System >> Diagnostic Information and Procedures >> Courtesy Lamps Malfunction >> Circuit/System Testing

Circuit/System Testing

Dome Lamp Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the E37F dome/reading lamps - front.
  2. Scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 20 Ω between the ground circuit terminal 6 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Interior/Courtesy Lighting Master Switch parameter is Door.
    • If the parameter is Cancel, test terminal 4 for short to ground.
    • If the parameter is ON, test terminal 5 for short to ground.
  4. Connect a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter is Door.
    • If not the specified value, test the signal circuit for a short to B+ or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Connect a 3 A fused jumper wire between the signal circuit terminal 5 and ground. Verify the scan tool Dome Lamp Switch parameter is Door.
    • If not the specified value, test the signal circuit for a short to B+ or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  6. If all circuits test normal, replace the E37F dome/reading lamps - front.

Courtesy Lamp Malfunction

  1. Disconnect the harness connector at the appropriate courtesy lamp.
  2. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 5 Ω between the ground circuit terminal listed below and ground:
    • E37 dome/reading lamp - terminal 6
    • A3 sunshade lamp - terminal B
    • E8 instrument panel courtesy lamp - terminal 2
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal listed below and ground:
    • E37 dome/reading lamp - terminal 1
    • A3 Sunshade lamp - terminal A
    • E8 instrument panel courtesy lamp - terminal 1
  4. Command the Courtesy Lamps 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 OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, replace the courtesy lamp.

Reading Lamp Malfunction

  1. Disconnect the harness connector at the appropriate E37 dome/reading lamp.
  2. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 5 Ω between the ground circuit terminal 6 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 illuminates between the control circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  4. If all circuits test normal, replace the E37 dome/reading lamp.

Sunshade Illumination Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate A3 sunshade.
  2. Ignition OFF, scan tool OFF, doors CLOSED, interior 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.
  3. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  4. If all circuits test normal, replace the A3 sunshade.

Rear Compartment Courtesy Lamp Malfunction

  1. Ignition OFF, disconnect the harness connector at the E8S rear compartment courtesy lamp.
  2. Open the trunk.
  3. Verify that a test lamp illuminates between B+ and the ground circuit terminal 2.
    • If the test lamp does not illuminate, test the ground circuit for short to voltage or an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the control circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, replace the E8S rear compartment courtesy lamp.

Instrument Panel Compartment Lamp Malfunction

  1. Ignition OFF, disconnect the harness connector at the E27 instrument panel compartment lamp.
  2. Open the instrument panel compartment.
  3. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 2.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the control circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, replace the E27 instrument panel compartment lamp.
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