B1477
Wiper Hi/Low Circuit Motor Short To Ground
Body Chassis/Safety Wiper System 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The wiper motor circuit is detecting a short to ground, meaning electricity is taking an unintended path to the chassis instead of flowing properly through the motor. Think of it like water escaping from a pipe through a hole instead of reaching the sprinkler head.

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Symptoms You May Notice
3 known symptoms for this code
Wipers remain stationary or inoperative
Wipers run continuously without control
Wiper switch becomes unresponsive to input
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the voltage and current draw of the wiper motor circuit in high and low speed modes. It detects abnormal current spikes when the circuit shorts to ground, comparing actual resistance against expected motor load thresholds. If resistance drops below normal operating parameters, a short-to-ground fault is flagged.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Motor Circuit Resistance 15-30 ohms typical motor load Less than 5 ohms or near-zero resistance
Current Draw 2-6 amps during operation Greater than 10 amps indicating short
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiper motor connector
Inspect and reseat the wiper motor electrical connector to ensure clean contact and proper seating.
2
Wiper motor harness
Check the wiring harness for damage, pinches, or exposed conductors causing ground contact and repair or tape as needed.
3
Wiper motor assembly
Replace the motor if internal windings are shorted or internal contacts are damaged.