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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 Ω between the test points:Ground circuit terminal 2 & Ground
    • If 10 Ω or greater 
    1. Ground Connection»Disconnect
    2. Test for less than 10 Ω between the test points:Ground circuit terminal 2 @Component harness & Ground Connection
      • If 10 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 10 Ω » Repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  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
    • 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.
      • If less than 1 V
    5. Ignition/Vehicle » Off
    6. Test for less than 2 Ω between the test points:Signal circuit terminal 1 @Component harness & Terminal 15 X6 @Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component:K9 Body Control Module
    • If the specified state 
  8. Test or replace the component:S46B Liftgate Unlatch Switch

Test 2

  1. Ignition/Vehicle » Off
  2. Remove the component:KR95A Liftgate Unlatch Relay
  3. Connect a test lamp between the test points:Control circuit terminal R2-1 & Ground
  4. Ignition » On / Vehicle » In Service Mode
  5. Perform the scan tool control function:Liftgate Unlatch»Unlatch

    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. Test for infinite resistance between the test points:Control circuit terminal R2-1 @Relay Socket & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points:Control circuit terminal R2-1@Relay Socket & Terminal 20 X5 @Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » 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 R2-1 @Relay Socket & Ground
      • If 1V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V » Replace the component:K9 Body Control Module
    • If the test lamp turns On and Off 
  6. Connect a test lamp between the test points:Control circuit terminal R2-2 & B+
  7. Perform the scan tool control function:Liftgate Unlatch»Unlatch

    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 R2-2 @ Relay Socket & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle » Off
    6. Test for less than 2 Ω between the test points:Control circuit terminal R2-2 @Relay Socket & Terminal 11 X5 @Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » 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 R2-2 @Relay Socket & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance » Replace the component:K9 Body Control Module
    • If the test lamp turns On and Off 
  8. Verify a test lamp turns On between the test points:B+ circuit terminal R2-3 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Test for less than 2 Ω between the test points:B+ circuit terminal R2-3 @Relay Socket & Output terminal@ F13DAFuse
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Test for infinite resistance between the test points:B+ circuit terminal R2-3 & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    3. Disconnect the electrical connector:M30 Liftgate Latch
    4. Test for infinite resistance between the test points:Control circuit terminal R2-3 @Relay Socket & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    5. Replace the component:Fuse
    6. Install the component:KR95A Liftgate Unlatch Relay
    7. Connect a test lamp between the test points:Control circuit terminal R2-5 & Ground circuit terminal
    8. Ignition » On / Vehicle » In Service Mode
    9. Perform the scan tool control function:Liftgate Unlatch»Unlatch

      Verify the test lamp turns On and Off.

      • If the test lamp does not turn On and Off » Test or replace the component:KR95A Liftgate Unlatch Relay
      • If the test lamp turns On and Off » Test or replace the component:M30 Liftgate Latch
    • If the test lamp turns On 
  9. Momentarily connect a 10 A fused jumper wire between the test points:B+ circuit terminal R2-3 & Control circuit terminal R2-5

    Verify the component does not turn On and Off when connecting and disconnecting the jumper wire:M30 Liftgate Latch

    • If the component turns On and Off 

      Test or replace the component:KR95A Liftgate Unlatch Relay

    • If the component does not turn On and Off 
  10. Ignition/Vehicle & All vehicle systems » Off
  11. Install the component:KR95A Liftgate Unlatch Relay
  12. Disconnect the electrical connector:M30 Liftgate Latch
  13. Test for less than 10 Ω between the test points:Ground circuit terminal 1 & Ground
    • If 10 Ω or greater 
    1. Ground Connection»Disconnect
    2. Test for less than 2 Ω between the test points:Ground circuit terminal 1 @Component harness & Ground Connection
      • 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.
    • If less than 10 Ω 
  14. Connect a test lamp between the test points:Control circuit terminal 1 & Ground circuit terminal 3
  15. Ignition » On / Vehicle » In Service Mode
  16. Perform the scan tool control function:Liftgate Unlatch»Unlatch

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 

      Repair the open/high resistance in the circuit:Control Circuit

    • If the test lamp is always On 

      Repair the short to voltage on the circuit:Control Circuit

    • If the test lamp turns On and Off 
  17. Test or replace the component:M30 Liftgate Latch
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