Pinpoint Test A : The Defrost System Is Inoperative: Notes
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Heated Window for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Glass, Frames and Mechanisms - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1C83:12 | Rear Defog Relay: Circuit Short to Battery | This DTC sets when the FCIM detects a short to voltage on the rear window defrost relay control circuit. |
| B1C83:14 | Rear Defog Relay: Circuit Short To Ground or Open | This DTC sets when the FCIM detects an open or short to ground on the rear window defrost relay control circuit. |
Possible Causes
- Fuse
- BJB
- Wiring, terminals or connectors
- Rear window defrost grid
- FCIM
Visual Inspection and Diagnostic Pre-checks
- Verify BJB fuse 99 (40A) is OK.
- Inspect the rear window defrost grid and electrical connectors for damage.