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Home >> GMC >> 2014 >> Terrain SLE, 4D Utility >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Object Detection System - Park Assist System) >> Diagnostic Information and Procedures >> DTC B356A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Terrain and 2012 Chevrolet Equinox. 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.
  2. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
  3. Test for less than 5 Ω between the S70L Steering Wheel Controls Switch - Left ground circuit terminal 7 and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify the scan tool Vehicle Direction Warning Switch Status parameter is OPEN.
    • If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K109 Frontview Camera Module.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground circuit terminal 7. Verify within 10 s the scan tool Vehicle Direction Warning Switch Status parameter is CLOSED.
    • If not the specified value, test the signal circuit terminal for a short to battery or an open/high resistance. If the circuit tests normal, replace the K109 Frontview Camera Module.
  6. If all circuits test normal, replace the S70L Steering Wheel Controls Switch - Left.
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