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Home >> Dodge and Ram >> 2024 >> ProMaster 2500 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Body Control Module (BCM) - DTCS B101E-15 To B1041-12) >> DTC Troubleshooting >> B1020-15 Reverse Gear Lights - Circuit Short To Battery Or Open >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2024 RAM ProMaster EV. However, it is still accessible from the selected car via links, so may be relevant.

When the Body Control Module (BCM) receives a communication network message indicating the vehicle is in reverse, the BCM provides a voltage output through the Backup Lamp Feed circuit to Backup Lamp. A ground path for the Backup Lamp is present through the harness to the body sheet metal.

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