Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 855 (AUXILIARY BRAKE SYSTEM)
2010 Mercury Mariner Hybrid, AWD
Section 855 (Auxiliary Brake System)
2010 Mercury Mariner Hybrid, AWDSECTION Section 855 (Auxiliary Brake System)
WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- Description And Operation
- Diagnostic Tests
- Auxiliary Brake System - Trailer Brake Control (TBC) Module
- Notes
- Principles of Operation
- Inspection and Verification
- Symptom Chart
- Pinpoint Tests
- Pinpoint Test A: DTC B1863 - TBC Ground Open Circuit
- Pinpoint Test B: DTCs B1317 And B1318 - Battery Voltage High/Low
- Pinpoint Test C: DTCs C2797, C2798, C2800, C2801 And C2803 - Brake Pressure Transducer Circuit Failure
- Pinpoint Test D: DTCs C2806, C2807 and C2808 - Trailer Brakes Circuit Failure
- Pinpoint Test E: The TBC Module LED Display Does Not Illuminate And The Trailer Brakes Are Inoperative
- Pinpoint Test F: The Trailer Brakes Are Inoperative
- Pinpoint Test G: The Trailer Brakes Are Always Engaged
- Pinpoint Test H: The Instrument Cluster Displays TBC FAULT
- Auxiliary Brake System - Trailer Brake Control (TBC) Module
- Removal And Installation
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.