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Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

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 Ω between the test points:Ground circuit terminal 2&Ground
    • If 10 Ω or greater 
    1. Ground Connection»Disconnect
    2. Test for less than 2 Ω between the test points:Ground circuit terminal 2@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 
  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 15X6@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: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:S58B Rear Compartment Lid Unlatch Switch - Interior
  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 2 Ω between the test points:Ground circuit terminal 2@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 
  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:X6K9 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: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:X6K9 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 14X6@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:S58B Rear Compartment Lid Unlatch Switch - Interior

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. Disconnect the electrical connector:M40 Rear Compartment Lid Latch
  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 2 Ω between the test points:Ground circuit terminal 2 &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 
  4. Verify the fuse is not open:F16RA Fuse
    • If the fuse is open 
    1. Replace the component:F16RA 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.
    • If the fuse is not open 
  5. Connect a test lamp between the test points:Control circuit terminal 1 &Ground circuit terminal 2
  6. Ignition » On / Vehicle » In Service Mode
  7. Perform the scan tool control function:Trunk Lid Unlatch Command»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

    • If the test lamp does not turn On and Off 
  8. Ignition/Vehicle » Off
  9. Connect the electrical connector:M40 Rear Compartment Lid Latch
  10. Disconnect the electrical connector:X3X53A Fuse Block - Rear Body
  11. Ignition » On / Vehicle » In Service Mode
  12. Momentarily connect a 10 A fused jumper wire between the test points:Control circuit terminal 8 X3 &B+

    Verify the component turns On and Off when connecting and disconnecting the jumper wire:M40 Rear Compartment Lid Latch

    • If the component does not turn On and Off 
    1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
    2. Disconnect the electrical connector:M40 Rear Compartment Lid Latch
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:Control 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 infinite resistance between the test points:Control circuit terminal 1 @Component harness&Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    7. Test for less than 2 Ω between the test points:Control circuit terminal 1 @Component harness&Terminal 8X3@Fuse Block Harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Test or replace the component:M40 Rear Compartment Lid Latch
    • If the component turns On and Off 
  13. Ignition/Vehicle & All vehicle systems » Off
  14. Verify the fuse is not open:F16RAFuse
    • If the fuse is open 

      Test or replace the component:X53A Fuse Block - Rear Body

    • If the fuse is not open 
  15. Test for less than 10 Ω between the test points:Ground circuit terminal 12X3&Ground
    • If 10 Ω or greater 
    1. Ground Connection»Disconnect
    2. Test for less than 2 Ω between the test points:Ground circuit terminal 12X3&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 
  16. Connect the electrical connector:X3X53A Fuse Block - Rear Body
  17. Disconnect the electrical connector:X5K9 Body Control Module
  18. Ignition » On / Vehicle » In Service Mode
  19. Momentarily connect a 3 A fused jumper wire between the test points:Control circuit terminal 11X5&B+

    Verify the component turns On and Off when connecting and disconnecting the jumper wire:M40 Rear Compartment Lid Latch

    • If the component does not turn On and Off 
    1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
    2. Disconnect the electrical connector:X3X53A Fuse Block - Rear Body
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:Control circuit terminal 11X5@Control module 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 infinite resistance between the test points:Control circuit terminal 11 X5@Control module harness&Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    7. Test for less than 2 Ω between the test points:Control circuit terminal 11 X5@Control module harness&Terminal 21 X13@Fuse Block Harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Test or replace the component:X53A Fuse Block - Rear Body
    • If the component turns On and Off 
  20. Replace the component:K9 Body Control Module
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