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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 groundor low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector : S58 Rear Compartment Lid Unlatch Switch
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 2 & Ground
    • If 10 ohmsor 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 ohmsor 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 : 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 shor t 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 : 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 Vor 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. Testor replace the component: S58 Rear Compartment Lid 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 : S48E Multifunction Switch - Center Console
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 9 & Ground
    • If 10 ohmsor greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 9 @ 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 : X1@K9 Body Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 7 @ Component harness & Ground
      • If less than infinite resistance - Repair the shor t 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 7 & Ground circuit terminal 9
  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 : X1@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 7 @ 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 7 @ Component harness & Terminal 18 X1@ control module harness
      • If 2 ohmsor 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. Testor replace the component: S48E Multifunction Switch - Center Console

Test 3

    NOTE:

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

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Remove the component: KR95B Rear Compartment Lid Unlatch Relay
  3. Test for less than 10 ohms between the test points: Ground circuit terminal R3-2 & Ground
    • If 10 ohmsor greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points: Ground circuit terminal R3-2 & 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. Connect a test lamp between the test points: Control circuit terminal R3-1 & Ground circuit terminal R3-2
  5. Ignition - On / Vehicle - In Service Mode
  6. Perfor m the scan tool control function: Trunk Lid Unlatch Command - 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 : X4@K9 Body Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal R3-1@Relay Socket & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Control circuit terminal R3-1 @ Relay Socket & Terminal 12 X4 @ Control module harness
      • If 2 ohmsor 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 : X4@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 R3-1 @ Relay Socket & Ground
      • If 1 Vor 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 
  7. Verify a test lamp turns on between the test points: B+ circuit terminal R3-3 & 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 ohms between the test points: B+ circuit terminal R3-3 @ Relay Socket & Output terminal @ F14DA Fuse
      • If 2 ohmsor greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - 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 R3-3 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Disconnect the electrical connector : M40 Rear Compartment Lid Latch
    4. Test for infinite resistance between the test points: Control circuit terminal R3-5 @ Relay Socket & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    5. Replace the component: F14DA Fuse
    6. Install the component: KR95B Rear Compartment Lid Unlatch Relay
    7. Connect a test lamp between the test points: Control circuit terminal 1 & Ground circuit terminal 2
    8. Ignition - On / Vehicle - In Service Mode
    9. Perform the scan tool control function: Trunk Lid Unlatch Command - Unlatch

      Verify the test lamp turns On and Off.

      • If the test lamp does not turn On and Off - Test or replace the component: KR95B Rear Compartment Lid Unlatch Relay
      • If the test lamp turns On and Off - Testor replace the component: M40 Rear Compartment Lid Latch
    • Go to next step: If the test lamp turns On 
  8. Momentarily connect a 10 A fused jumper wire between the test points: B+ circuit terminal R3-3 & Control circuit terminal R3-5

    Verify the component does not turn On and Off when connecting and disconnecting the jumper wire: M40 Rear Compartment Lid Latch

    • If the component turns On and Off 

      Test or replace the component: KR95B Rear Compartment Lid Unlatch Relay

    • Go to next step: If the component does not turn On and Off 
  9. Ignition/Vehicle & All vehicle systems - Off
  10. Install the component: KR95B Rear Compartment Lid Unlatch Relay
  11. Disconnect the electrical connector : M40 Rear Compartment Lid Latch
  12. Test for less than 10 ohms between the test points: Ground circuit terminal 2 & Ground
    • If 10 ohmsor 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 
  13. Connect a test lamp between the test points: Control circuit terminal 1 & Ground circuit terminal 2
  14. Ignition - On / Vehicle - In Service Mode
  15. Perform the scan tool control function: Trunk Lid Unlatch Command - 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

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