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Home >> Cadillac >> 2021 >> CT5 V, RWD >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> Door Lock Indicator Malfunction >> Circuit/System Testing
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Circuit/System Testing

Test 1

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: S13D Door Lock Switch - Driver
  3. Connect a test lamp between the test points: Control circuit terminal 5 & Ground circuit terminal 4
  4. Ignition - On / Vehicle - In Service Mode
  5. Operate the component: S13P Door Lock Switch - Passenger - Lock Switch & Unlock Switch
  6. Verify the test lamp turns On and Off.
    • If the test lamp is always Off 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Front Side Door Window Control Switch - Driver
    2. Test for infinite resistance between the control 4244 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control 4244 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the S79D Front Side Door Window Control Switch - Driver
    • If the test lamp is always On 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Front Side Door Window Control Switch - Driver, ignition ON.
    2. Test for less than 1 V between the control 4244 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79D Front Side Door Window Control Switch - Driver
    • Go to next step: If the test lamp turns On and Off 
  7. Test or replace the component: S13D Door Lock Switch - Driver

Test 2

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: S13P Door Lock Switch - Passenger
  3. Connect a test lamp between the test points: Control circuit terminal 5 & Ground circuit terminal 4
  4. Ignition - On / Vehicle - In Service Mode
  5. Operate the component: S13D Door Lock Switch - Driver - Lock Switch & Unlock Switch
  6. Verify the test lamp turns On and Off.
    • If the test lamp is always Off 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79P Front Side Door Window Switch-Passenger
    2. Test for infinite resistance between the control 4245 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control 4245 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the S79P Front Side Door Window Switch-Passenger
    • If the test lamp is always On 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79P Front Side Door Window Switch-Passenger, ignition ON.
    2. Test for less than 1 V between the control 4245 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79P Front Side Door Window Switch-Passenger
    • Go to next step: If the test lamp turns On and Off 
  7. Test or replace the component: S13P Door Lock Switch - Passenger

Test 3

  1. Ignition OFF.
  2. Disconnect the electrical connector: A23LR Rear Side Door Latch - Left
  3. Ignition ON.
  4. Test for greater than 7 V between the signal circuit terminal 6 and ground.
    • If less than 7 V 
    1. Test circuit 4648 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test circuit 4648 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the K9 Body Control Module.
    • Go to next step: If greater than 7 V 
  5. Ignition OFF.
  6. Connect the electrical connector: A23LR Rear Side Door Latch - Left
  7. Disconnect the electrical connector: S13LR Door Lock Switch - Left Rear
  8. Connect a test lamp between the test points: Control circuit terminal 5 & Ground circuit terminal 4
  9. Ignition - On / Vehicle - In Service Mode
  10. Operate the component: S13D Door Lock Switch - Driver - Lock Switch & Unlock Switch
  11. Verify the test lamp turns On and Off.
    • If the test lamp is always Off 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control 6675 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control 6675 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module
    • If the test lamp is always On 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control 6675 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module
    • Go to next step: If the test lamp turns On and Off 
  12. Test or replace the component: S13LR Door Lock Switch - Left Rear

Test 4

  1. Ignition OFF.
  2. Disconnect the electrical connector: A23RR Rear Side Door Latch - Right
  3. Ignition ON.
  4. Test for greater than 7 V between the signal circuit terminal 10 and ground.
    • If 7 V or less 
    1. Test circuit 4649 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Test circuit 4649 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the K9 Body Control Module.
    • Go to next step: If greater than 7 V 
  5. Ignition OFF.
  6. Connect the electrical connector: A23RR Rear Side Door Latch - Right
  7. Disconnect the electrical connector: S13RR Door Lock Switch - Right Rear
  8. Connect a test lamp between the test points: Control circuit terminal 5 & Ground circuit terminal 4
  9. Ignition - On / Vehicle - In Service Mode
  10. Operate the component: S13D Door Lock Switch - Driver - Lock Switch & Unlock Switch
  11. Verify the test lamp turns On and Off.
    • If the test lamp is always Off 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module
    2. Test for infinite resistance between the control 6677 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control 6677 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the S79P Front Side Door Window Switch-Passenger
    • If the test lamp is always On 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control 6677 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • Go to next step: If the test lamp turns On and Off 
  12. Test or replace the component: S13RR Door Lock Switch - Right Rear
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