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Home >> Fiat >> 2019 >> 500 Lounge, Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Body Control Module (BCM) - DTCS B10AD-19 To U1749-87 - 500 - Except Electric >> DTC Troubleshooting >> B16B7-13-Center High Mounted Stop Light - Circuit Open >> Theory Of Operation

Theory Of Operation

The Body Control Module (BCM) monitors the inputs from the Stop Lamp Switch. The Stop Lamp Switch contains a normally open switch and a normally closed switch. Separate fused ignition run/start voltage circuits supply the switches. When the BCM detects the brakes are applied, the BCM sends a voltage output to the Left and Right Tail Lamp Assemblies and Centered High Mounted Stop Lamp. A ground path for the lamps is present through the harness to the body sheet metal.

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