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Home >> Chevrolet >> 2018 >> Trax LT, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> Cruise Control Malfunction - DTC B3794, P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A-P155C, or P162C >> 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 module driver that will open under a high current condition before the fuse opens.
  • The module driver can open under normal conditions such as battery run down protection or a retained accessory power mode.
  • The ignition circuit referred to below is the 12 V reference/lighting control switch reference/voltage supply circuit from the K9 Body Control Module to the S70L Steering Wheel Controls Switch-Left.
  • The signal circuit referred to below is the cruise control set/coast/resume/accelerate switch signal from the S70L Steering Wheel Controls Switch-Left to the K9 Body Control Module.
  1. Ignition /Vehicle Off, disconnect the harness connector at the S70L Steering Wheel Controls Switch-Left, Ignition On/Vehicle in Service Mode.
  2. Verify a test lamp illuminates between the ignition circuit and ground.
    • If the test lamp does not illuminate 
    1. Ignition/Vehicle Off, disconnect the harness connector at the K9 Body Control Module.
    2. Test for greater than 100 Ω between the ignition circuit and ground.
      • If 100 Ω or less, repair the short to ground on the circuit.
      • Go to next step: If greater than 100 Ω
    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.
    • Go to next step: If the test lamp illuminates 
  3. Verify the scan tool K9 Body Control Module Cruise Control Switch Status parameter is Open/Short to Ground or Undetermined State.
    • If not Open/Short to Ground or Undetermined State 
    1. Ignition/Vehicle Off, disconnect the harness connector at the K9 Body Control Module, Ignition/Vehicle 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.
    • Go to next step: If Open/Short to Ground or Undetermined State 
  4. Install a 3 A fused jumper wire between the signal circuit and the ignition circuit.
  5. Verify the scan tool K9 Body Control Module Cruise Control Switch Status parameter is Short to Battery or Undetermined State.
    • If not Short to Battery or Undetermined State 
    1. Ignition/Vehicle Off, disconnect the 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.
      • Go to next step: 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 K9 Body Control Module.
    • Go to next step: If Short to Battery or Undetermined State 
  6. Test or replace the S70L Steering Wheel Controls Switch-Left.
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