LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2012 >> Regal Turbo, Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System >> Diagnostic Information and Procedures >> Park, License, and/or Tail Lamps Malfunction >> Circuit/System Testing

Circuit/System Testing

Park Lamp Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
  2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 6.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Park Lamps Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the K9 BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool Park Lamps Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, test or replace the S30 headlamp switch.

Park, License, and/or Tail Lamps Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate park, license or tail lamp.
  2. Test for less than 5 Ω between the ground circuit terminal listed below and ground:
    • E13 headlamp - terminal 1
    • E42 tail lamp assembly - terminal F
    • E7 license plate lamp - terminal 2
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal listed below and ground:
    • E13 headlamp - front park lamp - terminal 4
    • E13 headlamp - side marker lamp - terminal 7
    • E42 tail lamp assembly - terminal A
    • E7 license plate lamp - terminal 1
  4. Turn the park lamps ON and OFF by using the S30 headlamp switch. The test lamp should turn ON and OFF when changing between the selected states.
    • 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.
    • 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.
  5. If all circuits test normal, test or replace the park, license or tail lamp.
scientia non olet · About LEMON Manuals