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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 >> Power Door Locks Malfunction >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

S13 Door Lock Switch - Test

  1. Ignition/Vehicle - Off
  2. Disconnect the appropriate electrical connector: S13 Door Lock Switch
  3. Test for infinite resistance between the test points:
    • Signal terminal 2 & Ground terminal 4 - Lock Switch - Not Pressed
    • Signal terminal 3 & Ground terminal 4 - Unlock Switch - Not Pressed
    • If less than infinite resistance 

      Replace the component: S13 Door Lock Switch

    • Go to next step: If infinite resistance 
  4. Test for less than 3 ohms between the test points: Signal terminal 2 & Ground terminal 4 - Lock Switch - Pressed
    • If 3 ohms or greater 

      Replace the component: S13 Door Lock Switch

    • Go to next step: If less than 3 ohms 
  5. Test for less than 3 ohms between the test points: Signal terminal 3 & Ground terminal 4 - Unlock Switch - Pressed
    • If 3 ohms or greater 

      Replace the component: S13 Door Lock Switch

    • Go to next step: If less than 3 ohms 
  6. All OK.

A23 Door Latch

  1. Ignition/Vehicle - Off
  2. Disconnect the appropriate electrical connector:
    • A23D Front Side Door Latch - Driver
    • A23P Front Side Door Latch - Passenger
    • A23LR Rear Side Door Latch - Left
    • A23RR Rear Side Door Latch - Right
  3. Connect a 25 A fused jumper wire between the test points: Control terminal 8 & B+
  4. CAUTION:

    Complete the testing as quickly as possible in order to prevent overheating and damaging the component.

  5. Momentarily connect a jumper wire between the test points:
    • A23D Front Side Door Latch - Driver: Control terminal 7 & Ground
    • A23P Front Side Door Latch - Passenger: Control terminal 9 & Ground
    • A23LR Rear Side Door Latch - Left: Control terminal 7 & Ground
    • A23RR Rear Side Door Latch - Right: Control terminal 9 & Ground
  6. Reverse the jumper wires 2 times between the terminals.

    Verify the component works as specified: A23 Door Latch = Lock & Unlock

    • If not the specified state 

      Replace the component: A23 Door Latch

    • Go to next step: If the specified state 
  7. All OK.