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Home >> Jeep >> 2017 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Body Control Module (BCM) - DTCS B106A-12 To B1A90-51) >> DTC Troubleshooting >> B179F-2A-Rear Fog Lamp Switch - Stuck >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

The Body Control Module (BCM) receives the input from the headlamp switch requesting fog lamp illumination. The BCM provides a pulse width modulated (PWM) voltage output through the fog lamp driver circuit, which connects to the Fog Lamp. A ground path for the lamps is present through the harness.

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