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: S58 Rear Compartment Lid 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: 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: 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 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: 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 ohms or 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 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 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 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: S48E Multifunction Switch - Center Console

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. 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 ohms or 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. 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 
   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 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: 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 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 
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 ohms or 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 - Test or 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 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 
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. Test or replace the component: M40 Rear Compartment Lid Latch