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Circuit/System Testing

WARNING: This page is about a different car, the 2013 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    Each component on the control circuit may need to be disconnected to isolate a short to voltage or short to ground. Use the schematics to identify the following:

    • Lighting components the vehicle is equipped with
    • Each component's control and ground circuit terminals
    • Component locations on the backlighting control circuit
  1. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connectors at the components listed below.
    • E37D dome/reading lamps - overhead console
    • E37R dome/reading lamps - rear
    • E8D door courtesy lamp - driver
    • E8P door courtesy lamp - passenger
    • E8J instrument panel courtesy lamp - left
    • E8K instrument panel courtesy lamp - right
  2. Test for less than 10 Ω between the appropriate ground circuit terminal listed below and ground.
    • E37D dome/reading lamps - overhead console terminal 6
    • E37R dome/reading lamps - rear terminal 6
    • E8D door courtesy lamp - driver terminal 2
    • E8P door courtesy lamp - passenger terminal 2
    • E8J instrument panel courtesy lamp - left terminal 2
    • E8K instrument panel courtesy lamp - right terminal 2
    • If 10 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 10 Ω 
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground.
    • E37D dome/reading lamps - overhead console terminal 2
    • E37R dome/reading lamps - rear terminal 2
    • E8D door courtesy lamp - driver terminal 1
    • E8P door courtesy lamp - passenger terminal 1
    • E8J instrument panel courtesy lamp - left terminal 1
    • E8K instrument panel courtesy lamp - right terminal 1
  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 X2 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 X2 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 appropriate dome/courtesy lamp.
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