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Home >> Cadillac >> 2016 >> ELR >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Object Detection System And Pedestrian Protection System >> Diagnostic Information and Procedures >> DTC B356A: Vehicle Direction Warning Switch Circuit Short >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48C Multifunction Switch 1 - 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 1 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 Off.
    • If not Off 
    1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module.
    2. Test for infinite resistance between the S48C Multifunction Switch 1 - Instrument Panel signal circuit terminal 6 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 3A fused jumper wire between the signal circuit terminal 6 and ground circuit terminal 5.
  6. Verify within 10 s the scan tool Lane Departure 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 S48C Multifunction Switch 1 - Instrument Panel 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 S48C Multifunction Switch 1 - Instrument Panel.
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