LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2009 >> DTS 4.6 9 >> Repair and Diagnosis >> External Pages >> Different car >> Section 124 (Object Detection System) >> Diagnostic Information and Procedures >> DTC B138A >> 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 2010 Cadillac DTS. 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, verify DTC B138A is not set as current.
    • If the DTC is set, test the 8 V reference circuit terminal 1 for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the object alarm module.
  3. Install each sensor harness connector one at a time, checking DTCs after each sensor is connected. Verify DTC B138A is not set as current.
    • If the DTC is set, replace the object sensor that was connected immediately before the DTC set.
scientia non olet · About LEMON Manuals