Circuit/System Testing

Dome Lamp Switch Malfunction

1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the E37D dome/reading lamps - overhead console. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10Ω between the ground circuit terminal 6 and ground.
   • If 10Ω or greater 
   1. Ignition OFF.
   2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
   • If less than 10Ω 
3. Ignition ON.
4. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter is Door.
   • If Cancel 
   1. Ignition OFF, disconnect the X1 harness connector at the K9 body control module.
   2. Test for infinite resistance between the signal circuit terminal 4 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 body control module.
   • If On 
   1. Ignition OFF, disconnect the X7 harness connector at the K9 body control module.
   2. Test for infinite resistance between the signal circuit terminal 5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 body control module.
   • If Door 
5. Install a 3A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 6.
6. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter is Cancel.
   • If not Cancel 
   1. Ignition OFF, disconnect the X1 harness connector at the K9 body control module, ignition ON.
   2. Test for less than 1V between the signal circuit terminal 4 and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
   3. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K9 body control module.
   • If Cancel 
7. Install a 3A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 6.
8. Verify the scan tool Interior/Courtesy Lighting Master Switch parameter is On.
   • If not On 
   1. Ignition OFF, disconnect the X7 harness connector at the K9 body control module, ignition ON.
   2. Test for less than 1V between the signal circuit terminal 5 and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
   3. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K9 body control module.
   • If On 
9. Test or replace the E37D dome/reading lamps - overhead console.

Dome/Courtesy Lamps Malfunction

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 10Ω 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 10Ω or greater 
   1. Ignition OFF.
   2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
   • If less than 10Ω 
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 2Ω in the control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, 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 1V between the control circuit terminal and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K9 body control module.
   • If the test lamp turns ON and OFF 
5. Test or replace the appropriate dome/courtesy lamp.