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Circuit/System Testing

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

Each dome lamp may need to be disconnected to isolate the short to ground. Use the schematic to identify the following:

  • Each dome lamps control and ground circuit terminals
  • All dome lamps equipped on the vehicle
  • Component locations on the dome lamps control circuits
  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the inoperative E37 dome/reading lamps. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
    • E37F dome/reading lamps - front - terminal 6
    • E37R dome/reading lamps - rear - terminal 6
    • If 5 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 5 Ω 
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground.
    • E37F dome/reading lamps - front - terminal 2
    • E37R dome/reading lamps - rear - terminal 2
  4. Verify the test lamp turns ON and OFF when commanding the Courtesy Lamps ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X7 harness connector at the K9 body control module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 body control module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X7 harness connector at the K9 body control module, ignition ON.
    2. Test for less than 1 V between the control circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 body control module.
    • If the test lamp turns ON and OFF 
  5. Test or replace the inoperative E37 dome/reading lamp.
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