Question about Cars & Trucks
Check engine light on ? Have it checked for DTC'S - diagnostic trouble codes . All problems maybe linked together . If you don't want to take to a qualified repair shop , auto part stores will check codes for free ,most will ! i hear advance charges $20 now. Third brake light may just be a bulb or the Stop lamp relay in the under hood fuse box.
The body control module (BCM) is responsible for controlling the stop lamps. When the driver presses the brake pedal, the BCM will receive a signal from the brake pedal position sensor. The BCM then supplies battery positive voltage to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The stop lamps are grounded at G401 and G403. The CHMSL is grounded at G302.
Posted on Jun 30, 2017
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