LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2013 >> Verano Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 230 (Object Detection System - Park Assist System) >> Diagnostic Information and Procedures >> DTC B1405 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick Verano. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at each of the object sensors.
  2. Ignition ON, test for 6.3-10.4 V between the 8 V reference circuit terminal 1 at the B78G Rear Object Sensor - Left Outer harness connector and ground.
    • If less than the specified range, test the 8 V reference circuit for a short to ground. If the circuit tests normal, replace the K41R Rear Parking Assist Control Module.
    • If greater than the specified range, test the 8 V reference circuit for a short to voltage. If the circuit tests normal, replace the K41R Rear Parking Assist Control Module.
  3. Install each object alarm sensor harness connector one at a time, checking DTCs after each sensor is connected. Verify DTC B1405 is not set as current.
    • If the DTC is set, replace the object alarm sensor that was connected immediately before the DTC set.
  4. If all circuits test normal, replace the K41R Rear Parking Assist Control Module.
scientia non olet · About LEMON Manuals