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Home >> GMC >> 2017 >> Terrain SL, Gas >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> Object Detection System And Pedestrian Protection System >> Diagnostic Information and Procedures >> DTC B356A: Vehicle Direction Warning Switch Circuit Short to Ground >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, remove the ignition key, open the driver door, disconnect the scan tool, all vehicle systems OFF, this may take up to 2 min. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
  2. Test for less than 10 Ω between the ground circuit terminal 7 and ground.
    • If 10 Ω or greater 
    1. 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 the scan tool Lane Departure Warning Switch Status parameter is Open.
    • If not Open 
    1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module.
    2. Test for infinite resistance between the signal circuit terminal 2 at the S70L Steering Wheel Controls Switch - Left and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K109 Frontview Camera Module.
    • If Open 
  5. Reconnect the harness at S70L Steering Wheel Controls Switch - Left. Ignition ON.
  6. Verify the scan tool Lane Departure Warning Switch Status parameter while pressing and releasing the vehicle direction warning switch. The parameter should change between Open and Closed.
    • If the parameter does not change 

      Test or replace the S70L Steering Wheel Controls Switch - Left.

    • If the parameter changes 
  7. All OK.
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