Rear Defog Relay Circuit
Table of contents
B1C83 LINCOLN Possible Causes
- Faulty Rear Defog Relay
- Rear Defog Relay harness is open or shorted
- Rear Defog Relay circuit poor electrical connection
- Faulty Exterior Mirror
- Faulty Heating, Ventilation, and Air-Conditioning (HVAC)
How do I fix code B1C83 LINCOLN?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- B1C83:11 Rear Defog Relay Circuit Short to Ground
- B1C83:12 Rear Defog Relay Circuit Short to Battery
- B1C83:13 Rear Defog Relay Circuit Open
Cost of diagnosing the B1C83 LINCOLN code
The cost of diagnosing the B1C83 LINCOLN code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B1C83 LINCOLN Description
When the engine is running and the heated mirror/rear window defrost switch (integral to the Heating, Ventilation, and Air-Conditioning (HVAC) Module or Front Controls Interface Module (FCIM) if equipped with navigation system) is pressed, the HVAC module activates the rear window defrost relay. For vehicles equipped with navigation system, the FCIM sends the defrost request message to the HVAC module over the Controller Area Network (CAN). When the rear window defrost relay is active, voltage is supplied to the LH and RH exterior mirror glass and spotter mirror glass (if equipped). The LH and RH mirrors do not share the same ground circuits. The OBDII codes sets when the HVAC module senses a short to ground, short to voltage or open on the heated mirror/rear window defrost relay control circuit.