Circuit/System Testing

DTC B2585

1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module, ignition ON.
2. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.
   • If the test lamp does not illuminate and the circuit fuse is good 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
   • If the test lamp does not illuminate and the circuit fuse is open 
   1. Ignition OFF.
   2. Test for infinite resistance between the B+ circuit 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 the test lamp illuminates 
3. Ignition OFF, connect the X2 harness connector at the K9 body control module.
4. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate left park lamp.
5. Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
   • E4N park/turn signal lamp - left terminal 2 (with T4A)
   • E2LF side marker lamp - left front terminal 1 (with T4A)
   • E13L headlamp - left terminal 1 (with T4F)
   • E5AK tail lamp - left outer terminal 3
   • E5G tail lamp - left inner terminal 2
   • 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 
6. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
   • E4N park/turn signal lamp - left terminal 3 (with T4A)
   • E2LF side marker lamp - left front terminal 2 (with T4A)
   • E13L headlamp - left terminal 7 (with T4F)
   • E5AK tail lamp - left outer terminal 1
   • E5G tail lamp - left inner terminal 3
7. Verify the test lamp turns ON and OFF when commanding the Left Park Lamps 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.
   • If the test lamp turns ON and OFF 
8. Test or replace the appropriate left park lamp.

DTC B3867

1. Ignition OFF, disconnect the X1 harness connector at the K9 body control module, ignition ON.
2. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
   • If the test lamp does not illuminate and the circuit fuse is good 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
   • If the test lamp does not illuminate and the circuit fuse is open 
   1. Ignition OFF.
   2. Test for infinite resistance between the B+ circuit 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 the test lamp illuminates 
3. Ignition OFF, connect the X1 harness connector at the K9 body control module.
4. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate right park lamp.
5. Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
   • E4P park/turn signal lamp - right terminal 2 (with T4A)
   • E2RF side marker lamp - right front terminal 1 (with T4A)
   • E13R headlamp - right terminal 1 (with T4F)
   • E5AL tail lamp - right outer terminal 3
   • E5H tail lamp - right inner terminal 2
   • 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 
6. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
   • E4P park/turn signal lamp - right terminal 3 (with T4A)
   • E2RF side marker lamp - right front terminal 2 (with T4A)
   • E13R headlamp - right terminal 7 (with T4F)
   • E5AL tail lamp - right outer terminal 1
   • E5H tail lamp - right inner terminal 3
7. Verify the test lamp turns ON and OFF when commanding the Right Park Lamps 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.
   • If the test lamp turns ON and OFF 
8. Test or replace the appropriate right park lamp.