B1350
Heated Backlite Relay Short To Ground
Body Chassis/Safety Heated backlite circuit 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The heated rear window relay circuit is shorted to ground, preventing it from functioning properly. Think of it like a light switch that's stuck in the off position because the wiring is touching the ground.

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Symptoms You May Notice
3 known symptoms for this code
Rear defroster does not activate or function
B1350 fault code displayed on diagnostic scanner
Possible burning smell near rear window relay location
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the voltage and current draw of the heated backlite relay circuit. When the relay is commanded on, the ECU expects specific voltage levels; a short to ground causes abnormal current flow and zero voltage at the relay output. The control module detects this electrical fault condition and sets the code.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Relay Output Voltage 12V when commanded on 0V or voltage below threshold
Circuit Resistance >100 ohms <10 ohms (short to ground)
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness connectors
Inspect and reseat all connectors at the rear window relay and switch for corrosion or loose pins.
2
Heated backlite relay
Replace the relay with an OEM equivalent if connectors are clean but fault persists.
3
Wiring harness repair/replacement
Have a technician inspect the wiring between relay and rear window element for damage or pinched insulation causing short.