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Home › Cadillac › 2019 › CTS Base, AWD › Repair and Diagnosis › Body & Frame › Body, Cab Control Systems › Power Door Lock System › Diagnostic Information and Procedures › Power Door Locks Malfunction › Circuit/System Testing

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:S13D Door Lock Switch - Driver
  3. Test for less than 10 ohms between the test points:Ground circuit terminal 4 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points:Ground circuit terminal 4@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:Driver Door Lock Switch=Inactive
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X2@K9 Body Control Module
    3. Test for infinite resistance between the test points:
      • Signal circuit terminal 2@Component harness & Ground
      • Signal circuit terminal 3@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 2 & Ground circuit terminal 4
  7. Verify the scan tool parameter:Driver Door Lock Switch=Lock
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:X2@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 2@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 2@Component harness & Terminal 19 X2@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. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 3 & Ground circuit terminal 4
  9. Verify the scan tool parameter:Driver Door Lock Switch=Unlock
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:X2@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 3@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 3@Component harness & Terminal 15 X2@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 
  10. Test or replace the component:S13D Door Lock Switch - Driver

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:S13P Door Lock Switch - Passenger
  3. Test for less than 10 ohms between the test points:Ground circuit terminal 4 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points:Ground circuit terminal 4@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:Passenger Door Lock Switch=Inactive
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X7@K9 Body Control Module
    3. Test for infinite resistance between the test points:
      • Signal circuit terminal 2@Component harness & Ground
      • Signal circuit terminal 3@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 2 & Ground circuit terminal 4
  7. Verify the scan tool parameter:Passenger Door Lock Switch=Lock
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:X7@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 2@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 2@Component harness & Terminal 14 X7@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. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 3 & Ground circuit terminal 4
  9. Verify the scan tool parameter:Passenger Door Lock Switch=Unlock
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:X7@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 3@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 3@Component harness & Terminal 25 X7@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 
  10. Test or replace the component:S13P Door Lock Switch - Passenger

Test 3

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:A23D Door Latch Assembly - Driver
  3. Connect a test lamp between the test points:Control circuit terminal 7 & Control circuit terminal 8
  4. Ignition - On / Vehicle - In Service Mode
  5. Operate the component:S13D Door Lock Switch - Driver - Lock Switch & Unlock Switch

    Verify the test lamp does not turn On and Off.

    • If the test lamp turns On and Off 

      Test or replace the component:A23D Door Latch Assembly - Driver

    • Go to next step: If the test lamp does not turn On and Off 
  6. Ignition/Vehicle - Off
  7. Disconnect the electrical connector:X6@K9 Body Control Module
  8. Test for less than 2 ohms between the test points:
    • Control circuit terminal 8@A23D Door Latch Assembly - Driver & Terminal 4 X6@Control module harness
    • Control circuit terminal 7@A23D Door Latch Assembly - Driver & Terminal 1 X6@Control module harness
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  9. Test or replace the component:K9 Body Control Module

Test 4

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector:
    • A23LR Door Latch Assembly - Left Rear
    • A23P Door Latch Assembly - Passenger
    • A23RR Door Latch Assembly - Right Rear
  3. Connect a test lamp between the test points:
    • A23P Door Latch Assembly - PassengerControl circuit terminal 9 & Control circuit terminal 8
    • A23LR Door Latch Assembly - Left RearControl circuit terminal 7 & Control circuit terminal 8
    • A23RR Door Latch Assembly - Right RearControl circuit terminal 9 & Control circuit terminal 8
  4. Ignition - On / Vehicle - In Service Mode
  5. Operate the component:S13D Door Lock Switch - Driver - Lock Switch & Unlock Switch

    Verify the test lamp does not turn On and Off.

    • If the test lamp turns On and Off 

      Test or replace the component:A23 Door Latch Assembly

    • Go to next step: If the test lamp does not turn On and Off 
  6. Ignition/Vehicle - Off
  7. Disconnect the electrical connector:X6@K9 Body Control Module
  8. Ignition - On / Vehicle - In Service Mode
  9. Test for less than 2 ohms between the test points:
    • Control circuit terminal 9@A23P Door Latch Assembly - Passenger & Terminal 2 X6@Control module harness
    • Control circuit terminal 8@A23P Door Latch Assembly - Passenger & Terminal 4 X6@Control module harness
    • Control circuit terminal 7@A23LR Door Latch Assembly - Left Rear & Terminal 2 X6@Control module harness
    • Control circuit terminal 8@A23LR Door Latch Assembly - Left Rear & Terminal 4 X6@Control module harness
    • Control circuit terminal 9@A23RR Door Latch Assembly - Right Rear & Terminal 2 X6@Control module harness
    • Control circuit terminal 8@A23RR Door Latch Assembly - Right Rear & Terminal 4 X6@Control module harness
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  10. Test or replace the component:K9 Body Control Module

Test 5

    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 - Off
  2. Disconnect the electrical connector:X2 & X6@K9 Body Control Module
  3. Test for less than 10 ohms between the test points:Ground circuit terminal 3 X6 & 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 X6 & 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 a test lamp turns On between the test points:B+ circuit terminal 4 X2 & 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 4 X2 & Output terminal @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. Disconnect the electrical connector:
      • A23D Door Latch Assembly - Driver
      • A23LR Door Latch Assembly - Left Rear
      • A23P Door Latch Assembly - Passenger
      • A23RR Door Latch Assembly - Right Rear
    3. Test for infinite resistance between the test points: Control circuit terminal 4 X6@K9 Body Control Module & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:A23 Door Latch Assembly
    • Go to next step: If the test lamp turns On 
  6. Ignition/Vehicle - Off
  7. Connect the electrical connector:X2@K9 Body Control Module
  8. Ignition - On / Vehicle - In Service Mode
  9. Test for less than 1 V between the test points:
    • Control circuit terminal 1 X6@K9 Body Control Module & Ground
    • Control circuit terminal 2 X6@K9 Body Control Module & Ground
    • Control circuit terminal 4 X6@K9 Body Control Module & Ground
    • If greater than 1 V 

      Repair the short to voltage on the circuit.

    • Go to next step: If 1 V or less 
  10. Ignition/Vehicle - Off
  11. Disconnect the electrical connector:X2 & X3@X53A Fuse Block - Rear Body
  12. Test for infinite resistance between the test points:
    • Control circuit terminal 4 X6@K9 Body Control Module & Ground
    • Control circuit terminal 28 X2@X53A Fuse Block - Rear Body & Ground
    • Control circuit terminal 36 X2@X53A Fuse Block - Rear Body & Ground
    • Control circuit terminal 16 X3@X53A Fuse Block - Rear Body & Ground
    • { With UTT }Control circuit terminal 17 X3@X53A Fuse Block - Rear Body & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  13. Connect the electrical connector:X2 & X3@X53A Fuse Block - Rear Body
  14. Test for infinite resistance between the test points:Control circuit terminal 2 X6@K9 Body Control Module & Ground
    • If less than infinite resistance 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X2@X53A Fuse Block - Rear Body
    3. Test for infinite resistance between the test points:Control circuit terminal 2 X6@K9 Body Control Module & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:X53A Fuse Block - Rear Body
    • Go to next step: If infinite resistance 
  15. Test for infinite resistance between the test points:Control circuit terminal 1 X6@K9 Body Control Module & Ground
    • If less than infinite resistance 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X3@X53A Fuse Block - Rear Body
    3. Test for infinite resistance between the test points:Control circuit terminal 1 X6@K9 Body Control Module & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:X53A Fuse Block - Rear Body
    • Go to next step: If infinite resistance 
  16. Replace the component:K9 Body Control Module
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