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Home >> Buick >> 2016 >> Envision >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Object Detection System) >> Diagnostic Information and Procedures >> DTC B356A: Vehicle Direction Warning Switch Circuit Short to Ground >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the S48D Multifunction Switch 2 - Instrument Panel ground circuit terminal 2 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 K109 Frontview Camera Module.
    2. Test for infinite resistance between the S48D Multifunction Switch 2 - Instrument Panel signal circuit terminal 4 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. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground circuit terminal 2.
    NOTE:

    B356A 02 will set after approximately 10 s.

  6. Verify the scan tool Lane Departure Warning Switch Status parameter is Closed.
    • If not Closed 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K109 Frontview Camera 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
    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 K109 Frontview Camera Module.
    • If Closed 
  7. Test or replace the S48D Multifunction Switch 2 - Instrument Panel.
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