Pinpoint Test D : The Defrost System Is Inoperative: Notes
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Wiring Diagram Heated Window for schematic and connector information.
Refer to Wiring Diagram Power Mirrors for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Glass, Frames and Mechanisms - Overview . REFER to: Glass, Frames and Mechanisms - System Operation and Component Description .
FCIM DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1C83:12 | Rear Defog Relay: Circuit Short to Battery | A continuous and on-demand DTC that sets in the FCIM if the FCIM detects a short to voltage on the heated mirror/rear window defrost relay control circuit. |
| B1C83:14 | Rear Defog Relay: Circuit Short To Ground or Open | A continuous and on-demand DTC that sets in the FCIM if the FCIM detects an open or short to ground on the heated mirror/rear window defrost relay control circuit. |
Possible Causes
- Fuse
- Wiring, terminals or connectors
- Rear window defrost relay
- Exterior mirror glass
- Exterior spotter mirror glass
- Exterior mirror
- FCIM
- BJB
Visual Inspection and Diagnostic Pre-checks
- Verify BJB fuse 99 (40A) is OK.
- Inspect the rear window defrost grid and electrical connectors for damage.
NOTE:
Clean the entire mirror assembly and glass to assist in verification of the customer concern and/or impact damage. Do not clean any mirror glass or housing with an ice scraper, razor blade, abrasive pad, harsh chemicals or petroleum based cleaning products, as these may damage the mirror glass and/or housing.