Circuit/System Testing

Diagnostic A

1. Ignition OFF and all vehicle systems OFF, disconnect the KR76 Retained Accessory Power Relay. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 86 and ground.
   • 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. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 87 and ground.
   • If the test lamp does not illuminate 

     Replace the X53A Fuse Block - Rear Body

   • If the test lamp illuminates 
5. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.
6. Verify the test lamp turns ON and OFF when commanding the Accessory/Retained Accessory Power Relay On and Off with a scan tool.
   • If the test lamp is always OFF 
   1. Ignition OFF, remove the test lamp, disconnect the 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, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
   2. Test for less than 1 V between the control circuit 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 
7. Connect the KR76 Retained Accessory Power Relay.
8. Disconnect the appropriate X80 Accessory Power Receptacle.
9. Ignition OFF.
10. Verify that a test lamp does not illuminate between each of the ignition circuits listed below and ground.
    • X80F Accessory Power Receptacle - Front - Ignition circuit terminal A
    • X80H Accessory Power Receptacle - Center Console - Ignition circuit terminal A
    • If the test lamp illuminates 

      Repair the short to voltage on the ignition circuit.

    • If the test lamp does not illuminate 
11. Ignition ON.
12. Verify that a test lamp illuminates between each of the ignition circuits listed below and ground.
    • X80F Accessory Power Receptacle - Front - Ignition circuit terminal A
    • X80H Accessory Power Receptacle - Center Console - Ignition circuit terminal A
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
       • If 2 Ω or greater, repair the open/high resistance in the circuit.
       • If less than 2 Ω, test or replace the KR76 Retained Accessory Power Relay.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
       • If less than infinite resistance, repair the short to ground on the circuit.
       • If infinite resistance, test or replace the appropriate X80 Accessory Power Receptacle.
    • If the test lamp illuminates 
13. Test or replace the appropriate X80 Accessory Power Receptacle.

Diagnostic B

1. Ignition OFF and all vehicle systems OFF, disconnect the S3 Transmission Shift Lever.
2. Connect a test lamp between the ignition circuit terminal 1 and ground, Ignition ON.
3. Verify the test lamp turns ON and OFF when commanding the Accessory Power Relay On and Off with a scan tool.
   • If the test lamp is always OFF 
   1. Ignition OFF, remove test lamp, disconnect the harness connector at the K9 Body Control Module.
   2. Test for infinite resistance between the ignition 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, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
   2. Test for less than 1 V between the control circuit 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 
4. Test or replace the S3 Transmission Shift Lever.