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: S58A Rear Compartment Lid Unlatch Switch - Exterior
3. Test for less than 10 ohms between the test points: Ground circuit terminal 3 & Ground
   • If 10 ohms or greater 
   1. Ground Connection - Disconnect
   2. Test for less than 2 ohms between the test points: Ground circuit terminal 3 @ 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 3
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: S58A Rear Compartment Lid Unlatch Switch - Exterior

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 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: F22DA
   • If the fuse is open 
   1. Replace the component: Fuse
   2. Verify the fuse does not open.
      • If the fuse opens - Test or replace the component: X51A Fuse Block - Instrument Panel
      • 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. Perform the scan tool control function: Rear Body Closure Unlatch - 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. Disconnect the electrical connector: X4 @ K9 Body Control Module
10. Ignition - On/Vehicle - In Service Mode
11. Test for less than 1 V between the test points: Control circuit terminal 10 X4 @ Control module harness & Ground
    • If 1 V or greater 

      Replace the component: X51A Fuse Block - Instrument Panel

    • Go to next step: If less than 1 V 
12. Momentarily connect a 3 A fused jumper wire between the test points: Control circuit terminal 10 X4 & B+

    Verify the test lamp turns On and Off.

    • If the test lamp does not turn On and Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 10 ohms between the test points: Control circuit terminal 3 @ M40 Rear Compartment Lid Latch & Ground
    • If 10 ohms or greater 

      Replace the component: X51A Fuse Block - Instrument Panel

    • Go to next step: If the test lamp turns On and Off 
13. Connect the electrical connector: X4 @ K9 Body Control Module
14. Ignition - On/Vehicle - In Service Mode
15. Perform the scan tool control function: Rear Body Closure Unlatch - Unlatch

    Verify the test lamp turns On and Off.

    • If the test lamp does not turn On and Off 

      Replace the component: K9 Body Control Module

    • Go to next step: If the test lamp turns On and Off 
16. Test or replace the component: M40 Rear Compartment Lid Latch