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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1390 (Trailer Brake Control System) >> Diagnostic Information and Procedures >> DTC B3894 >> Circuit/System Verification
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Circuit/System Verification

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON, press the brake pedal. The brake lights should illuminate and the TBCM Brake Switch Status parameter should indicate ON.

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