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Home >> Cadillac >> 2019 >> XT5 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (Driver Assistance Systems) >> Diagnostic Information and Procedures >> DTC B356A >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2018 Cadillac XT5. 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 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 8 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 Vehicle Direction Warning Switch Status parameter is Off.
    • If not Off 
    1. Ignition OFF, disconnect the harness connector at the B174W Frontview Camera Module.
    2. Test for infinite resistance between the S48A Multifunction Switch - 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 B174W Frontview Camera Module.
    • Go to next step: If Off 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 10 and ground circuit terminal 8.
  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 K124 Active Safety Control Module. Ignition ON.
    2. Test for less than 1 V between the S48A Multifunction Switch - Instrument Panel signal circuit terminal 4 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 K124 Active Safety Control Module.
    • Go to next step: If On 
  7. Test or replace the S48A Multifunction Switch - Instrument Panel.
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