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Home >> Buick >> 2019 >> Encore Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Driver Assistance Systems) >> Diagnostic Information and Procedures >> DTC B356A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 Chevrolet Trax and 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  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 S48D Multifunction Switch 2 - Instrument Panel.
  2. Test for less than 10 Ω between the ground circuit terminal 3 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.
    • Go to next step: 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 signal circuit terminal 5 at the S48D Multifunction Switch 2 - Instrument Panel and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If infinite resistance, replace the K109 Frontview Camera Module.
    • Go to next step: If Off 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground circuit terminal 3.
  6. Verify within 10 s the scan tool Lane Departure Warning Switch Status parameter is On.
    • If not On 
    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 K109 Frontview Camera Module signal circuit terminal 5 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: 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.
    • Go to next step: If On 
  7. Test or replace the S48D Multifunction Switch 2 - Instrument Panel.
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