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Home › Cadillac › 2017 › CT6 Plug-In › Repair and Diagnosis › Body & Frame › Door Locks › Theft Deterrent System › Diagnostic Information and Procedures › Inclination/Intrusion Sensor Malfunction › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B165 Content Theft Deterrent Sensor Module. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 5 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.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal 3 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 B+ 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.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the B165 Content Theft Deterrent Sensor Module.
    • If the test lamp illuminates 
  5. Ignition OFF, arm the content theft deterrent system.
  6. Test for greater than 4.5 V between the serial data circuit terminal 4 and ground.
    • If 4.5 V or less 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the serial data circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the serial data circuit 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 greater than 4.5 V 
  7. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
  8. Test for less than 1 V between the B165 Content Theft Deterrent Sensor Module serial data circuit terminal 4 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  9. Ignition OFF, connect the harness connector at the B165 Content Theft Deterrent Sensor Module. Disconnect the harness connector at the S43 Theft Deterrent Sensor Disable Switch. It may take up to 2 min for all vehicle systems to power down.
  10. Test for less than 10 Ω between the ground circuit terminal 3 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.
    • If less than 10 Ω 
  11. Ignition OFF, connect the harness connector at the S43 Theft Deterrent Sensor Disable Switch. Disconnect the harness connector at the B165 Content Theft Deterrent Sensor Module, ignition ON.
  12. Test for less than 1 V between the circuit terminal listed below and ground:
    • Control circuit terminal 2
    • Signal circuit terminal 1
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  13. Connect a 3 A fused jumper wire between the control circuit terminal 2 and B+.
  14. Verify the intrusion/inclination sensor disable LED is illuminated.
    • If the indicator is not illuminated 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the S43 Theft Deterrent Sensor Disable Switch.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, replace the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S43 Theft Deterrent Sensor Disable Switch.
    • If the indicator is illuminated 
  15. Test for infinite resistance between the signal circuit terminal 1 and ground.
    • If less than infinite resistance 
    1. Ignition OFF, disconnect the harness connector at the S43 Theft Deterrent Sensor Disable Switch.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the S43 Theft Deterrent Sensor Disable Switch.
    • If infinite resistance 
  16. Test for less than 10 Ω between the signal circuit terminal 1 and ground with the intrusion/inclination sensor disable switch pressed.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the S43 Theft Deterrent Sensor Disable Switch.
    2. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, replace the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S43 Theft Deterrent Sensor Disable Switch.
      • If less than 10 Ω 
  17. Test or replace the B165 Content Theft Deterrent Sensor Module.
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