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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Vehicle Access System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B195B or B195C >> Circuit/System Testing

Circuit/System Testing

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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. 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

    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. 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
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