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Home >> Buick >> 2013 >> Encore Leather, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 96 (Object Detection System And Pedestrian Protection System) >> Diagnostic Information and Procedures >> DTC B356A: Vehicle Direction Warning Switch >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2016 Chevrolet Trax and 2016 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connectors at the S48E Multifunction Switch - Center Console and S70L Steering Wheel Controls Switch - Left. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the following ground circuit terminals and ground:
    • S48E Multifunction Switch - Center Console terminal 9
    • S70L Steering Wheel Controls Switch - Left terminal 7
    • 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 S48E Multifunction Switch - Center Console signal circuit terminal 7 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 S48E Multifunction Switch - Center Console signal circuit terminal 7 and ground.
  6. Verify DTC B356A 02 sets in approximately 10 s.
    • If DTC does not set 
    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. 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 DTC sets 
  7. Test or replace the S48E Multifunction Switch - Center Console or S70L Steering Wheel Controls Switch - Left.
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