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Home >> GMC >> 2017 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 239 (Object Detection System) >> Diagnostic Information and Procedures >> DTC B356A: Vehicle Direction Warning Switch Circuit Short >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. 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 connector at the S48A Multifunction Switch - 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 ground circuit terminal 5 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 Vehicle Direction Warning Switch Status parameter is Off.
    • If not Off 
    1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module.
    2. Test for infinite resistance between the S48A Multifunction Switch - Instrument Panel signal circuit terminal 7 (with UV6) or terminal 6 (without UV6) 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 Off 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 7 (with UV6) or terminal 6 (without UV6) and ground circuit terminal 5.
  6. Verify within 10 s the scan tool Vehicle Direction Warning Switch Status parameter is On.
    • If not On 
    1. Ignition OFF, disconnect harness connector at the K109 Frontview Camera Module. Ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 6 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 On 
  7. Test or replace the S48A Multifunction Switch - Instrument Panel.
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