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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Steering >> Steering Wheel And Steering Column >> Diagnostic Information and Procedures >> DTC B285A: Steering Column Position Module >> Circuit/System Testing >> Switch Malfunction

Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the S71 Steering Column Tilt and Telescope Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal G 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, replace the K99 Steering Column Position Control Module.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Test for B+ between the signal circuit terminals listed below and ground:
    • Terminal A
    • Terminal F
    • Terminal C
    • Terminal B
    • If less than B+ 
    1. Ignition OFF, disconnect the X1 harness connector at the K99 Steering Column Control Module.
    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
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K99 Steering Column Position Control Module.
    • If B+ 
  5. Ignition OFF, disconnect the X1 harness connector at the K99 Steering Column Position Control Module. It may take up to 2 min for all vehicle systems to power down.
  6. Ignition ON.
  7. Test for less than 1 v between the signal circuit terminals listed below and ground:
    • Terminal 6
    • Terminal 3
    • Terminal 4
    • Terminal 5
    • If greater than 1 V 

      Repair the short to voltage on the circuit

    • If less than 1 V 
  8. Ignition OFF, connect the X1 harness connector at the K99 Steering Column Position Control Module. It may take up to 2 min for all vehicle systems to power down.
  9. Ignition ON.
  10. Install a 3 A fused jumper wire between the signal circuits listed below and the ground circuit terminal G. Verify the steering column telescopes FORWARD and REVERSE to the soft stop.
    NOTE: When performing the following test, make sure that the steering column is not already in the position the test is attempting to produce.
    • Terminal A
    • Terminal F
    • If the M65 Steering Column Telescope Motor does not operate 
    1. Ignition OFF, disconnect the X2 harness connector at the K99 Steering Column Position Control Module.
    2. Test for 1-2.5 Ω between terminal 7 and terminal 8.
      • If not within the specified range, replace the M65 Steering Column Telescope Motor.
      • If within the specified range, replace the K99 Steering Column Position Control Module.
    • If the M65 Steering Column Telescope Motor operates 
  11. Install a 3 A fused jumper wire between the signal circuits listed below and the ground circuit terminal G. Verify the steering column telescopes FORWARD and REVERSE to the soft stop.
    NOTE: When performing the following test, make sure that the steering column is not already in the position the test is attempting to produce.
    • Terminal B
    • Terminal C
    • If the M68 Steering Column Tilt Motor does not operate 
    1. Ignition OFF, disconnect the X2 harness connector at the K99 Steering Column Position Control Module.
    2. Test for 1-2.5 Ω between terminal 9 and terminal 10.
      • If not within the specified range, replace the M68 Steering Column Tilt Motor.
      • If within the specified range, replace the K99 Steering Column Position Control Module.
    • If the M68 Steering Column Tilt Motor operates 
  12. Test or replace the S71 Steering Column Tilt and Telescope Switch.
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