Circuit/System Testing

Without ATH/BTM

1. Ignition OFF, disconnect the S39 Ignition Switch.
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. Remove the test lamp.
   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. Remove the test lamp.
   2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on one of the following circuits listed below:
      NOTE:

      To help isolate a short to ground, it may be necessary to disconnect modules that are connected to the following circuits:

      • B+ circuit terminal 4
      • Ignition circuit terminal 2
      • Ignition circuit terminal 3
      • Ignition circuit terminal 5
   • Go to next step: If the test lamp illuminates 
3. Connect the S39 Ignition Switch.
4. Ignition ON, disconnect the harness connector at the S39 Ignition Switch while the ignition is ON.
5. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 6 and ground.
   • If less than 4.8 V 
   1. Connect the S39 Ignition Switch.
   2. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module and S39 Ignition Switch.
   3. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   4. Test for less than 2 Ω in the 5 V reference 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 greater than 5.2 V 
   1. Connect the S39 Ignition Switch.
   2. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
   3. Ignition ON, disconnect the harness connector at the S39 Ignition Switch while the ignition is ON.
   4. Test for less than 1 V between the 5 V reference 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.
   • Go to next step: If between 4.8 - 5.2 V 
6. Connect the S39 Ignition Switch.
7. Ignition OFF.
8. Disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
9. Verify a test lamp illuminates between each of the ignition circuits listed below and ground:
   • Ignition circuit terminal 5
   • Ignition circuit terminal 6
   • 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, 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 remove the test lamp.
   2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance, replace the K9 Body Control Module.
   • Go to next step: If the test lamp illuminates 
10. Ignition OFF with the key in.
11. Verify a test lamp illuminates between ignition circuit terminal 15 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF with the key out, 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, 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 with the key out remove the test lamp.
    2. Test for infinite resistance between the ignition circuit terminal 15 and ground.
       • If less than infinite resistance, repair the short to ground on the circuit.
       • Go to next step: If infinite resistance, replace the K9 Body Control Module.
    • Go to next step: If the test lamp illuminates 
12. Connect the X3 harness connector at the K9 Body Control Module, ignition ON.
13. Disconnect the S39 Ignition Switch.
14. Test for less than 1 V between each of the ignition circuits listed below and ground:
    • Ignition circuit terminal 2
    • Ignition circuit terminal 3
    • Ignition circuit terminal 5
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
15. Test or replace the S39 Ignition Switch.

With ATH/BTM

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S38 Ignition Mode Switch. 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 4 and ground.
   • If 10 Ω or greater 
   1. 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 10 Ω 
3. Test for less than 10 Ω between the low reference circuit terminal 7 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, replace the K84 Keyless Entry Control Module.
   • Go to next step: If less than 10 Ω 
4. Connect the S38 Ignition Mode Switch, ignition ON.
5. Disconnect the S38 Ignition Mode Switch.
6. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is greater than 11 V.
   • If 11 V or less 
   1. Connect the S38 Ignition Mode Switch.
   2. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module and S38 Ignition Mode Switch.
   3. Test for infinite resistance between the signal circuit terminal 6 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
   • Go to next step: If greater than 11 V 
7. Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground.
8. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is less than 1 V.
   • If 1 V or greater 
   1. Disconnect the harness connector at the K9 Body Control Module.
   2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
   3. Test for less than 2 Ω in signal 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.
   • Go to next step: If less than 1 V 
9. Connect the harness connector at the S38 Ignition Mode Switch.
10. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is 8 - 10 V, with the S38 Ignition Mode Switch released.
    • If not between 8 - 10 V 

      Test or replace the S38 Ignition Mode Switch.

    • Go to next step: If between 8 - 10 V 
11. Verify the scan tool K9 Body Control Module Push Button Ignition Switch Voltage parameter is 4 - 7 V, with the S38 Ignition Mode Switch pressed.
    • If not between 4 - 7 V 

      Test or replace the S38 Ignition Mode Switch.

    • Go to next step: If between 4 - 7 V 
12. Disconnect the X1 harness connector at the K84 Keyless Entry Control Module.
13. Test for infinite resistance between the signal circuit terminal 11 and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
14. Ignition ON.
15. Test for less than 1 V between the signal circuit terminal 11 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
16. Test for 4.5 - 5.5 kΩ between the signal circuit terminal 11 and the low reference circuit terminal 12, with the S38 Ignition Mode Switch released.
    • If not between 4.5 - 5.5 kΩ 
    1. Ignition OFF, disconnect the harness connector at the S38 Ignition Mode Switch.
    2. Test for less than 2 Ω in the signal 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 S38 Ignition Mode Switch.
    • Go to next step: If between 4.5 - 5.5 kΩ 
17. Test for 1 - 1.5 kΩ between the signal circuit terminal 11 and the low reference circuit terminal 12, with the S38 Ignition Mode Switch pressed.
    • If not between 1 - 1.5 kΩ 

      Test or replace the S38 Ignition Mode Switch.

    • Go to next step: If between 1 - 1.5 kΩ 
18. Replace the K84 Keyless Entry Control Module.