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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Image Display Cameras) >> Diagnostic Information and Procedures >> Rearview Camera Full Display Mirror Malfunction >> Circuit/System Testing

Circuit/System 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.
  1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A10 Inside Rearview Mirror.
  2. Test for less than 10 Ω between the A10 Inside Rearview Mirror ground circuit terminal 5 X1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • 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.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 2 X1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the A10 Inside Rearview Mirror.
    • Go to next step: If the test lamp illuminates 
  5. Ignition OFF/vehicle OFF, connect the X1 harness connector at the A10 Inside Rearview Mirror.
  6. Disconnect the coax cable connector at the A10 Inside Rearview Mirror and wait for 5 sec.
  7. Ignition On/Vehicle in Service Mode, test for 7 - 11 V at the A10 Inside Rearview Mirror.
    • If the value outside range of 7 - 11V 

      Test or replace the A10 Inside Rearview Mirror.

    • Go to next step: If the value within the range of 7 - 11 V 
  8. Ignition OFF/vehicle OFF, connect the coax cable connector at the A10 Inside Rearview Mirror.
  9. Disconnect the coax cable connector at the B352 Video Display Inside Rearview Mirror Camera, and wait for 5 sec.
  10. Ignition On/Vehicle in Service Mode, test for 7 - 11 V between the center conductor of the coax cable and the coax cable ground shield wires.
    • If the value within the range of 7 - 11 V 

      Replace the B352 Video Display Inside Rearview Mirror Camera.

    • Go to next step: If the value outside range of 7 - 11V 
  11. Replace the coax cable.
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