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: S46B Liftgate Unlatch Switch
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: Trunk Lid/Liftgate Window Exterior Unlatch Switch = Inactive
   • If not the specified state 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector: 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: Trunk Lid/Liftgate Window Exterior Unlatch Switch = Active
   • If not the specified state 
   1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
   2. Disconnect the electrical connector: 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.
      • 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: S46B Liftgate Unlatch Switch

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: M30 Liftgate Latch
3. Test for less than 10 ohms between the test points: Ground circuit terminal 1 & Ground
   • If 10 ohms or greater 
   1. Ground Connection - Disconnect
   2. Test for less than 2 ohms between the test points: Ground circuit terminal 1 & 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 3 & Ground circuit terminal 1
6. Ignition - On/Vehicle - In Service Mode
7. Operate the component: S46B Liftgate Unlatch Switch - Pressed

   Verify the test lamp does not turn On and Off.

   • If the test lamp turns On and Off 

     Test or replace the component: M30 Liftgate Latch

   • Go to next step: If the test lamp does not turn On and Off 
8. Ignition/Vehicle - Off
9. Connect the electrical connector: M30 Liftgate Latch
10. Disconnect the electrical connector: X2 @ X53A Fuse Block - Rear Body
11. Ignition - On/Vehicle - In Service Mode
12. Momentarily connect a 15 A fused jumper wire between the test points: Control circuit terminal 16 X2 & B+

    Verify the component turns On and Off when connecting and disconnecting the jumper wire: M30 Liftgate Latch

    • If the component does not turn On and Off 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: M30 Liftgate Latch
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 3 @ 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 3 @ 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 3 @ Component harness & Control circuit terminal 16 X2 @ Fuse 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: M30 Liftgate 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. Connect a test lamp between the test points: Control circuit terminal 15 X2 & Ground
16. Operate the component: S46B Liftgate Unlatch Switch - Pressed

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off
    2. Test for infinite resistance between the test points: Control circuit terminal 8 X4 @ Control module harness & 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 ohms between the test points: Control circuit terminal 8 X4 @ Control module harness & Control circuit terminal 15 X2 @ Fuse 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: K9 Body Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X5 @ K9 Body Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 8 X4 @ Control module harness & Ground
       • If 1 V or greater - Repair the short to voltage on the circuit.
       • If less than 1 V - Replace the component: K9 Body Control Module
    • Go to next step: If the test lamp turns On and Off 
17. Connect a test lamp between the test points: Control circuit terminal 14 X2 & B+
18. Operate the component: S46B Liftgate Unlatch Switch - Pressed

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X5 @ K9 Body Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 20 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 less than 2 ohms between the test points: Control circuit terminal 20 X5 @ Control module harness & Control circuit terminal 14 X2 @ Fuse Block 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
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X5 @ K9 Body Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 20 X5 @ Control module 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 test lamp turns On and Off 
19. Replace the component: X53A Fuse Block - Rear Body