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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Object Detection System And Pedestrian Protection System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B356A: Vehicle Direction Warning Switch Circuit >> Circuit/System Testing >> Chevrolet, GMC

Chevrolet, GMC

  1. Ignition ON and all vehicle systems OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel. 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 8 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 ground circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Verify the scan tool Lane Departure Warning Switch Status parameter is Open.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the B174W Frontview Camera - Windshield.
    2. Test for infinite resistance between the signal circuit terminal 10 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the B174W Frontview Camera - Windshield Camera Module.
    • If Inactive 
  4. Install a 3 A fused jumper wire between the signal circuit terminal 10 and ground.
  5. Verify the scan tool Lane Departure Warning Switch Status parameter is Closed.
    • If not Closed 
    1. Ignition OFF, disconnect the harness connector at the B174W Frontview Camera - Windshield, 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
    3. Ignition OFF
    4. 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 B174W Frontview Camera - Windshield.
    • If Closed 
  6. Test or replace the S48A Multifunction Switch - Instrument Panel.
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