Circuit/System Testing

Without T4L

1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate E13 Headlamp Assembly.
2. Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
   • Terminal 4 (Z88+T4F)
   • Terminal 5 (All others without T4L)
   • 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.
   • Go to next step: If less than 5 Ω 
3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
   • Terminal 7 (Z88+T4F)
   • Terminal 4 (All others without T4L)
4. Verify the test lamp turns ON and OFF when commanding the appropriate Front Park Lamp/Daytime Running Lamp ON and OFF with a scan tool.
   • If the test lamp is always OFF 
   1. Ignition OFF, disconnect the X4 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 X4 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
   • Go to next step: If the test lamp turns On and Off 
5. Test or replace the E13 Headlamp Assembly.

With T4L

1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate E13 Headlamp Assembly.
2. Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
   • Terminal 4 (Z88+T4L)
   • Terminal 5 (X88+T4L)
   • 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.
   • Go to next step: If less than 5 Ω 
3. Ignition on, command the appropriate Front Park Lamp/Daytime Running Lamp ON with a scan tool.
4. Test for 4.8V-5.2V between the appropriate control circuit terminal listed below and ground.
   • Terminal 7 (Z88+T4L)
   • Terminal 4 (X88+T4L)
   • If less than 4.8V 
   1. Ignition OFF, disconnect the X4 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 more than 5.2V 
   1. Ignition OFF, disconnect the X4 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
   • Go to next step: If between 4.8V-5.2V 
5. Test or replace the E13 Headlamp Assembly.