Circuit/System Testing

Diagnostic A

1. Ignition OFF/Vehicle OFF, connect a test lamp between the ignition circuits listed below and ground.
   • X51A Fuse Block - Instrument Panel - Fuse F20DA
   • X51A Fuse Block - Instrument Panel - Fuse F24DA
   • X51A Fuse Block - Instrument Panel - Fuse F42DA
   • X51A Fuse Block - Instrument Panel - Circuit breaker F42DA
2. Disconnect the harness connector at the K84 Keyless Entry Control Module.
3. Momentarily Install a 3 A fused jumper wire between the control circuit terminal 7 X1 and B+.
4. Verify the test lamp turns ON and OFF when connecting and disconnecting the jumper wire.
   • If the test lamp is always OFF 
   1. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance.
   2. 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 X51A Fuse Block - Instrument Panel.
   • If the test lamp is always ON 
   1. 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.
   • Go to next step: If the test lamp turns ON and OFF 
5. Ignition OFF/Vehicle OFF, connect the harness connector at the K84 Keyless Entry Control Module.
NOTE:

The vehicle may not be equipped with all components as listed below.

6. Disconnect the appropriate T22 Mobile Device Wireless Charger Module, X92 USB Receptacle, or X80F Accessory Power Receptacle - Front.
7. Ignition ON/Vehicle in Service Mode.
8. Verify that a test lamp illuminates between each of the ignition circuits listed below and ground.
   • T22 Mobile Device Wireless Charger Module - Ignition circuit terminal 1
   • X92 USB Receptacle - Ignition circuit terminal 6
   • X80F Accessory Power Receptacle - Front - Ignition circuit terminal A
   • If the test lamp does not illuminate and the circuit fuse good 
   1. Ignition OFF/Vehicle 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, Replace the K84 Keyless Entry Control Module.
   • If the test lamp does not illuminate and the circuit fuse is open 
   1. Ignition OFF/Vehicle 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.
      • If resistance, test or replace the appropriate T22 Mobile Device Wireless Charger Module, X92 USB Receptacle, or X80F Accessory Power Receptacle - Front.
   • Go to next step: If the test lamp illuminates 
9. Test or replace the appropriate T22 Mobile Device Wireless Charger Module, X92 USB Receptacle, or X80F Accessory Power Receptacle - Front

Diagnostic B

1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the KR73 Ignition Main 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/Vehicle 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 10 Ω 
3. Ignition ON/Vehicle in Service Mode.
4. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
   • If the test lamp does not illuminate 

     Replace the X50A Fuse Block - Underhood

   • Go to next step: 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 Run/Crank Relay On and Off with a scan tool.
   • If the test lamp is always OFF 
   1. Ignition OFF/Vehicle 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.
      • Go to next step: 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/Vehicle OFF and all vehicle systems OFF, remove the test lamp, disconnect the K9 Body Control Module, Ignition ON/Vehicle in Service Mode.
   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.
   • Go to next step: If the test lamp turns ON and OFF 
7. Verify that a test lamp does not illuminate between the ignition circuits listed below and ground.
   • Ignition circuit terminal 87
   • Ignition circuit terminal 87A
   • If the test lamp illuminates 

     Repair the short to voltage on the ignition circuit.

   • Go to next step: If the test lamp does not illuminate 
8. Ignition ON/Vehicle in Service Mode, connect a 40 A fused jumper wire between the B+ circuit terminal 30 and the ignition circuits listed below.
   • Ignition circuit terminal 87
   • Ignition circuit terminal 87A
9. Verify the device is activated.
   • If the device is not activated 
   1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the device.
   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
   3. 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, replace the device.
   • Go to next step: If the device activates 
10. Test or replace the KR73 Ignition Main Relay.

Diagnostic C

1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the KR75 Engine Controls Ignition Relay, Ignition ON/Vehicle in Service Mode.
2. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
   • If the test lamp does not illuminate 

     Replace the X50A Fuse Block - Underhood

   • Go to next step: If the test lamp illuminates 
3. Verify a test lamp illuminates between the B+ circuit terminal 85 and ground.
   • If the test lamp does not illuminate 

     Replace the X50A Fuse Block - Underhood

   • Go to next step: If the test lamp illuminates 
4. Connect a test lamp between the B+ circuit terminal 85 and the control circuit terminal 86.
5. Verify the test lamp turns ON and OFF when switching the Ignition ON/Vehicle in Service Mode and OFF/Vehicle OFF.
   • If the test lamp is always OFF 
   1. Ignition OFF/Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module, Ignition ON/Vehicle in Service Mode.
   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.
      • Go to next step: If less than 1 V
   3. Ignition OFF/Vehicle OFF.
   4. 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 K20 Engine Control Module.
   • If the test lamp is always ON 
   1. Ignition OFF/Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 Engine 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, replace the K20 Engine Control Module.
   • Go to next step: If the test lamp turns ON and OFF 
6. Verify a test lamp does not illuminate between the ignition circuit terminal 87 and ground.
   • If the test lamp illuminates 

     Repair the short to voltage on the circuit.

   • Go to next step: If the test lamp does not illuminate 
7. Ignition ON/Vehicle in Service Mode, connect a 40 A fused jumper wire between the B+ circuit terminal 30 and the ignition circuit terminal 87.
8. Verify device is activated.
   • If the device is not activated 
   1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the device.
   2. Test for infinite resistance between the ignition circuit terminal 87 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   3. 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, replace the device.
   • Go to next step: If the device activates 
9. Test or replace the KR75 Engine Controls Ignition Relay.

Diagnostic D

1. Disconnect the inline harness connector X200.
NOTE:

Testing will be performed on the T19 Power Supply Transformer side of harness connector.

2. Verify a test lamp illuminates between B+ terminal 33 and ground.
   • If the test lamp does not illuminate 
   1. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance.
   2. 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, refer to Stop/Start System Malfunction .
   • Go to next step: If the test lamp illuminates 
3. Ignition ON/Vehicle in Service Mode.
4. Disconnect the X4 harness connector at the K9 Body Control Module.
5. Test for less than 1 V between the control circuit terminal 9 and ground.
   • If 1 V or greater 

     Repair the short to voltage on the circuit.

   • Go to next step: If less than 1 V 
6. Connect a 3 A fused jumper wire between the K9 Body Control Module control circuit terminal 9 and B+.
7. Verify a test lamp illuminates between the X51A Fuse Block - Instrument Panel test point TP3 and ground.
   • If the test lamp does not illuminate 
   1. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance.
   2. 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 X51A Fuse Block - Instrument Panel.
   • Go to next step: If the test lamp illuminates 
8. Connect the X4 harness connector at the K9 Body Control Module.
9. Disconnect the X7 harness connector at the K9 Body Control Module.
10. Ignition ON/Vehicle in Service Mode.
11. Test for less than 1 V between the control circuit terminal 16 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
12. Connect a 3 A fused jumper wire between the control circuit terminal 16 and B+.
13. Verify a test lamp does not illuminate between the X51A Fuse Block - Instrument Panel test point TP3 and ground.
    • If the test lamp illuminates 
    1. Test for infinite resistance between the control circuit and ground.
       • If less than infinite resistance, repair the short to ground on the circuit.
       • Go to next step: If infinite resistance.
    2. 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 X51A Fuse Block - Instrument Panel.
    • Go to next step: If the test lamp does not illuminate 
14. Ignition OFF/Vehicle OFF, connect the harness connector at the K9 Body Control Module.
15. Ignition ON/Vehicle in Service Mode.
16. Verify a test lamp illuminates between the X51A Fuse Block - Instrument Panel test point TP3 and ground.
    • If the test lamp does not illuminate 

      Replace the K9 Body Control Module.

    • Go to next step: If the test lamp illuminates 
17. Disconnect the harness connector at the appropriate device controlled by the KR104A Battery Saver Relay 1.
NOTE:

The vehicle may not be equipped with all components as listed below. Use wiring schematics to determine which components are supplied their B+ feed by the KR104A Battery Saver Relay 1. Use the connector end view to identify the B+ circuit terminal for each of those components.

18. Ignition OFF/Vehicle OFF. It may take up to 1 min after the ignition is switched OFF and retained accessory power is disabled before the K9 Body Control Module sends a command to unlatch the relay.
19. Verify that a test lamp does not illuminate between the B+ circuits listed below and ground.
    • P16 Instrument Cluster - B+ circuit terminal 7 X1
    • X83 Auxiliary Audio Input - B+ circuit 6 X1
    • K73 Telematics Communication Interface Control Module - B+ circuit terminal 15 X1
    • P17 Info Display Module - B+ circuit terminal 1 X1
    • A26 HVAC Controls - B+ circuit terminal 1
    • A11 Radio - B+ circuit terminal 8 X3
    • K74 Human Interface Control Module - B+ circuit terminal 7 X1
    • K182 Parking Assist Control Module - B+ circuit terminal 1 X1
    • If the test lamp illuminates 

      Repair the short to voltage on the B+ circuit.

    • Go to next step: If the test lamp does not illuminate 
20. Ignition ON/Vehicle in Service Mode.
21. Verify that a test lamp illuminates between each of the B+ circuits listed below and ground.
    • P16 Instrument Cluster - B+ circuit terminal 7 X1
    • X83 Auxiliary Audio Input - B+ circuit 6 X1
    • K73 Telematics Communication Interface Control Module - B+ circuit terminal 15 X1
    • P17 Info Display Module - B+ circuit terminal 1 X1
    • A26 HVAC Controls - B+ circuit terminal 1
    • A11 Radio - B+ circuit terminal 8 X3
    • K74 Human Interface Control Module - B+ circuit terminal 7 X1
    • K182 Parking Assist Control Module - B+ circuit terminal 1 X1
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF/Vehicle OFF, 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, replace the X51A Fuse Block - Instrument Panel.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF/Vehicle 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, test or replace the appropriate device that is controlled by the KR104A Battery Saver Relay 1..
    • Go to next step: If the test lamp illuminates 
22. Test or replace the appropriate device that is controlled by the KR104A Battery Saver Relay 1.

Diagnostic E

1. Disconnect the X4 harness connector at the K9 Body Control Module.
2. Test for less than 1 V between the control circuit terminal 9 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. Connect a 3 A fused jumper wire between the K9 Body Control Module control circuit terminal 9 and B+.
4. Verify a test lamp illuminates between the fuses listed below and ground.
   • X53A Fuse Block - Rear Body - Fuse F52RA
   • X53A Fuse Block - Rear Body - Fuse F53RA
   • X53A Fuse Block - Rear Body - Fuse F54RA
   • X53A Fuse Block - Rear Body - Fuse F56RA
   • X53A Fuse Block - Rear Body - Fuse F57RA
   • If the test lamp does not illuminate 
   1. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance.
   2. 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 X51A Fuse Block - Instrument Panel.
   • Go to next step: If the test lamp illuminates 
5. Connect the X4 harness connector at the K9 Body Control Module.
6. Disconnect the X7 harness connector at the K9 Body Control Module.
7. Ignition ON/Vehicle in Service Mode.
8. Test for less than 1 V between the control circuit terminal 16 and ground.
   • If 1 V or greater 

     Repair the short to voltage on the circuit.

   • Go to next step: If less than 1 V 
9. Connect a 3 A fused jumper wire between the control circuit terminal 16 and B+.
10. Verify a test lamp does not illuminate between the fuses listed below and ground.
    • X53A Fuse Block - Rear Body - Fuse F52RA
    • X53A Fuse Block - Rear Body - Fuse F53RA
    • X53A Fuse Block - Rear Body - Fuse F54RA
    • X53A Fuse Block - Rear Body - Fuse F56RA
    • X53A Fuse Block - Rear Body - Fuse F57RA
    • If the test lamp illuminates 
    1. Test for infinite resistance between the control circuit and ground.
       • If less than infinite resistance, repair the short to ground on the circuit.
       • Go to next step: If infinite resistance.
    2. 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 X53A Fuse Block - Rear Body.
    • Go to next step: If the test lamp does not illuminate 
11. Ignition OFF/Vehicle OFF, connect the harness connector at the K9 Body Control Module.
12. Ignition ON/Vehicle in Service Mode.
13. Verify a test lamp illuminates between the fuses listed below and ground.
    • X53A Fuse Block - Rear Body - Fuse F52RA
    • X53A Fuse Block - Rear Body - Fuse F53RA
    • X53A Fuse Block - Rear Body - Fuse F54RA
    • X53A Fuse Block - Rear Body - Fuse F56RA
    • X53A Fuse Block - Rear Body - Fuse F57RA
    • If the test lamp does not illuminate 

      Replace the K9 Body Control Module.

    • Go to next step: If the test lamp illuminates 
14. Disconnect the harness connector at the appropriate device controlled by the KR104B Battery Saver Relay 2.
NOTE:

The vehicle may not be equipped with all components as listed below. Use wiring schematics to determine which components are supplied their B+ feed by the KR104B Battery Saver Relay 2. Use the connector end view to identify the B+ circuit terminal for each of those components.

15. Ignition OFF/Vehicle OFF. It may take up to 1 min after the ignition is switched OFF and retained accessory power is disabled before the K9 Body Control Module sends a command to unlatch the relay.
16. Verify that a test lamp does not illuminate between the B+ circuits listed below and ground.
    • K19 Suspension Control Module - B+ circuit terminal 1
    • K47 Rear Differential Clutch Control Module - B+ circuit terminal 10 X1
    • K157 Video Processing Control Module - B+ circuit terminal 1 X2
    • B218L Side Object Sensor Module - Left - B+ circuit terminal 8
    • B218R Side Object Sensor Module - Right - B+ circuit terminal 8
    • B233R Radar Sensor Module - Short Range Rear - B+ circuit terminal 1
    • K171 Hands-Free Liftgate Sensor Control Module - B+ circuit terminal 2 X1
    • B174W Frontview Camera - Windshield - B+ circuit terminal 3
    • K124 Active Safety Control Module - Windshield - B+ circuit terminal 1 X1
    • B233B Radar Sensor Module - Long Range - B+ circuit terminal 1
    • B233LF Radar Sensor Module - Short Range Left Front - B+ circuit terminal 1
    • B233RF Radar Sensor Module - Short Range Right Front - B+ circuit terminal 1
    • B200 Rain Sensor Module - B+ circuit terminal 1
    • S25 Garage Door Opener - B+ circuit terminal 1
    • S48B Multifunction Switch - Overhead Console - B+ circuit terminal 1
    • B165 Content Theft Deterrent Sensor Module - B+ circuit terminal 1
    • P25 Power Sounder Content Theft Deterrent Alarm Module - B+ circuit terminal 1
    • If the test lamp illuminates 

      Repair the short to voltage on the B+ circuit.

    • Go to next step: If the test lamp does not illuminate 
17. Ignition ON/Vehicle in Service Mode.
18. Verify that a test lamp illuminates between each of the B+ circuits listed below and ground.
    • K19 Suspension Control Module - B+ circuit terminal 1
    • K47 Rear Differential Clutch Control Module - B+ circuit terminal 10 X1
    • K157 Video Processing Control Module - B+ circuit terminal 1 X2
    • B218L Side Object Sensor Module - Left - B+ circuit terminal 8
    • B218R Side Object Sensor Module - Right - B+ circuit terminal 8
    • B233R Radar Sensor Module - Short Range Rear - B+ circuit terminal 1
    • K171 Hands-Free Liftgate Sensor Control Module - B+ circuit terminal 2 X1
    • B174W Frontview Camera - Windshield - B+ circuit terminal 3
    • K124 Active Safety Control Module - Windshield - B+ circuit terminal 1 X1
    • B233B Radar Sensor Module - Long Range - B+ circuit terminal 1
    • B233LF Radar Sensor Module - Short Range Left Front - B+ circuit terminal 1
    • B233RF Radar Sensor Module - Short Range Right Front - B+ circuit terminal 1
    • B200 Rain Sensor Module - B+ circuit terminal 1
    • S25 Garage Door Opener - B+ circuit terminal 1
    • S48B Multifunction Switch - Overhead Console - B+ circuit terminal 1
    • B165 Content Theft Deterrent Sensor Module - B+ circuit terminal 1
    • P25 Power Sounder Content Theft Deterrent Alarm Module - B+ circuit terminal 1
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF/Vehicle OFF, 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, replace the X53A Fuse Block - Rear Body.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF/Vehicle 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, test or replace the appropriate device that is controlled by the KR104B Battery Saver Relay 2..
    • Go to next step: If the test lamp illuminates 
19. Test or replace the appropriate device that is controlled by the KR104B Battery Saver Relay 2.