Pinpoint Test J: The Rear Window Defrost System Does Not Shut Off Automatically
WARNING: This page is about a different car, the 2021 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 Condition BCMC B15E5:15 Rear Heated Windscreen Output: Circuit Short To Battery Or Open If equipped with diesel engine, sets when the BCMC detects a short to voltage or open in the rear window defrost output circuit. Possible Sources
- Wiring, terminals or connectors
- BCMC
- J1 CHECK THE REAR WINDOW DEFROST OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: BCMC C1035B (gas engine) or C1035E (diesel engine).
- Ignition ON.
- For gas engine, measure:
Positive Lead Measurement / Action Negative Lead C1035B-31 Ground
- For diesel engine, measure:
Positive Lead Measurement / Action Negative Lead C1035E-5 Ground
Is any voltage present?
Yes REPAIR the circuit. No GO to J2 - J2 CHECK FOR CORRECT BCMC (BODY CONTROL MODULE C) OPERATION
- Ignition OFF.
- Disconnect and inspect all the BCMC connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins as necessary
- pushed-out pins - install new pins as necessary
- Reconnect the BCMC connectors and all previously disconnected rear window defrost system connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new BCMC. REFER to: Body Control Module C (BCMC) . No The system is operating correctly at this time. The concern may have been caused by poor connections. ADDRESS the root cause of any connector or pin issues.