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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> Cruise Control Malfunction >> Circuit/System Testing

Circuit/System Testing

NOTE:
  • An open ignition circuit or fuse before the control module will cause communication DTCs or power mode mismatch DTCs to set against or in the control module. This failure mode will be diagnosed in the no communications diagnostic procedure or power mode mismatch.
  • This test assumes the ignition circuit has a driver that will open under a high current condition before the fuse opens.
  • The driver can open under normal conditions such as battery run down protection or a retained accessory power mode.
  1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left, ignition ON.
  2. Verify a test lamp illuminates between the ignition circuit terminal 8 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    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
    3. 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, test or replace the K9 Body Control Module.
    • If the test lamp illuminates 
  3. Test for less than 1 V between the signal circuit terminals listed below:
    • Signal circuit terminal 9
    • Signal circuit terminal 10
    • If 1 V or greater 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • If less than 1 V 
  4. Ignition OFF.
  5. Test for greater than 100 Ω between the signal circuit terminals listed below and ground:
    • Signal circuit terminal 9
    • Signal circuit terminal 10
    • If 100 Ω or less 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 Body 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, replace the K9 Body Control Module.
    • If greater than 100 Ω 
  6. Ignition ON.
  7. Test for B+ between the ignition circuit terminal 8 and the control circuit terminals listed below:
    • Signal circuit terminal 9
    • Signal circuit terminal 10
    • If less than B+ 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
    2. Test for less than 10 Ω in the signal circuit end to end.
      • If 10 Ω or greater, repair the open/high resistance in the signal circuit.
      • If less than 10 Ω, replace the K9 Body Control Module.
    • If B+ 
  8. Test or replace the S70L Steering Wheel Controls Switch - Left.
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