Circuit/System Testing

Test 1

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: S58B Rear Compartment Lid Unlatch Switch - Interior
3. Test for less than 10 ohms between the test points: Ground circuit terminal 2 & Ground
   • If 10 ohms or greater 
   1. Ground Connection - Disconnect
   2. Test for less than 2 ohms between the test points: Ground circuit terminal 2@Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 ohms 
4. Ignition - On/Vehicle - In Service Mode
5. Verify the scan tool parameter: Interior Liftgate/Liftgate Window Unlatch Switch = Inactive
   • If not the specified state 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector: X6@K9 Body Control Module
   3. Test for infinite resistance between the test points: Signal circuit terminal 1@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K9 Body Control Module
   • Go to next step: If the specified state 
6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground circuit terminal 2
7. Verify the scan tool parameter: Interior Liftgate/Liftgate Window Unlatch Switch = Active
   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire (s)
   2. Disconnect the electrical connector: X6@K9 Body Control Module
   3. Ignition - On/Vehicle - In Service Mode
   4. Test for less than 1 V between the test points: Signal circuit terminal 1@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
   5. Ignition/Vehicle - Off
   6. Test for less than 2 ohms between the test points: Signal circuit terminal 1@Component harness & Terminal 14 X6@Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K9 Body Control Module
   • Go to next step: If the specified state 
8. Test or replace the component: S58B Rear Compartment Lid Unlatch Switch - Interior

Test 2

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: M40 Rear Compartment Lid Latch
3. Test for less than 10 ohms between the test points: Ground circuit terminal 2 & Ground
   • If 10 ohms or greater 
   1. Ground Connection - Disconnect
   2. Test for less than 2 ohms between the test points: Ground circuit terminal 2 & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 ohms 
4. Verify the fuse is not open: F39RA Fuse
   • If the fuse is open 
   1. Replace the component: F39RA Fuse
   2. Verify the fuse does not open.
      • If the fuse opens - Test or replace the component: X53A Fuse Block - Rear Body
      • If the fuse does not open, go to the next step.
   • Go to next step: If the fuse is not open 
5. Connect a test lamp between the test points: Control circuit terminal 1 & Ground circuit terminal 2
6. Ignition - On/Vehicle - In Service Mode
7. Perform the scan tool control function: Trunk Lid Unlatch Command - Unlatch

   Verify the test lamp does not turn On and Off.

   • If the test lamp turns On and Off 

     Test or replace the component: M40 Rear Compartment Lid Latch

   • Go to next step: If the test lamp does not turn On and Off 
8. Ignition/Vehicle - Off
9. Connect the electrical connector: M40 Rear Compartment Lid Latch
10. Disconnect the electrical connector: X1@X53A Fuse Block - Rear Body
11. Ignition - On/Vehicle - In Service Mode
12. Momentarily connect a 10 A fused jumper wire between the test points: Control circuit terminal 16 X1 & B+

    Verify the component turns On and Off when connecting and disconnecting the jumper wire: M40 Rear Compartment Lid Latch

    • If the component does not turn On and Off 
    1. Ignition/Vehicle - Off & Remove - Jumper wire (s)
    2. Disconnect the electrical connector: M40 Rear Compartment Lid Latch
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 1@Component harness & Ground
       • If 1 V or greater - Repair the short to voltage on the circuit.
       • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for infinite resistance between the test points: Control circuit terminal 1@Component harness & Ground
       • If less than infinite resistance - Repair the short to ground on the circuit.
       • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points: Control circuit terminal 1@Component harness & Control circuit terminal 16 X1@Fuse/Junction Block Harness
       • If 2 ohms or greater - Repair the open/high resistance in the circuit.
       • If less than 2 ohms - Test or replace the component: M40 Rear Compartment Lid Latch
    • Go to next step: If the component turns On and Off 
13. Ignition/Vehicle & All vehicle systems - Off
14. Verify the fuse is not open: F39RA Fuse
    • If the fuse is open 

      Test or replace the component: X53A Fuse Block - Rear Body

    • Go to next step: If the fuse is not open 
15. Test for less than 10 ohms between the test points: Ground circuit terminal 14 X1 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 14 X1 & Ground Connection
       • If 2 ohms or greater - Repair the open/high resistance in the circuit.
       • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
16. Connect the electrical connector: X1@X53A Fuse Block - Rear Body
17. Disconnect the electrical connector: X5@K9 Body Control Module
18. Ignition - On/Vehicle - In Service Mode
19. Momentarily connect a 3 A fused jumper wire between the test points: Control circuit terminal 11 X5 & B+

    Verify the component turns On and Off when connecting and disconnecting the jumper wire: M40 Rear Compartment Lid Latch

    • If the component does not turn On and Off 
    1. Ignition/Vehicle - Off & Remove - Jumper wire (s)
    2. Disconnect the electrical connector: X1@X53A Fuse Block - Rear Body
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 11 X5@Control module harness & Ground
       • If 1 V or greater - Repair the short to voltage on the circuit.
       • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for infinite resistance between the test points: Control circuit terminal 11 X5@Control module harness & Ground
       • If less than infinite resistance - Repair the short to ground on the circuit.
       • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points: Control circuit terminal 11 X5@Control module harness & Control circuit terminal 15 X1@Fuse/Junction Block Harness
       • If 2 ohms or greater - Repair the open/high resistance in the circuit.
       • If less than 2 ohms - Test or replace the component: X53A Fuse Block - Rear Body
    • Go to next step: If the component turns On and Off 
20. Replace the component: K9 Body Control Module

Test 3

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: S58A Rear Compartment Lid Unlatch Switch - Exterior
3. Test for less than 10 ohms between the test points: Ground circuit terminal 2 & Ground
   • If 10 ohms or greater 
   1. Ground Connection - Disconnect
   2. Test for less than 2 ohms between the test points: Ground circuit terminal 2@Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
   • Go to next step: If less than 10 ohms 
4. Ignition - On/Vehicle - In Service Mode
5. Momentarily connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground circuit terminal 2
6. Verify a click can be heard or felt at the following component when the jumper wire was connected: M40 Rear Compartment Lid Latch
   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire (s)
   2. Disconnect the electrical connector: X6 @ K9 Body Control Module
   3. Ignition - On/Vehicle - In Service Mode
   4. Test for less than 1 V between the test points: Signal circuit terminal 1@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
   5. Ignition/Vehicle - Off
   6. Test for less than 2 ohms between the test points: Signal circuit terminal 1@Component harness & Terminal 15 X6@Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω
   7. Test for infinite resistance between the test points: Signal circuit terminal 1@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K9 Body Control Module
   • Go to next step: If the specified state 
7. Test or replace the component: S58A Rear Compartment Lid Unlatch Switch - Exterior