B1735
Mirror Driver Vertical Switch Circuit Short To Battery
Body Chassis/Safety Mirror Control 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The driver's side mirror vertical adjustment motor circuit is receiving constant maximum voltage, like a stuck gas pedal that won't let the motor stop moving. This prevents normal mirror positioning and control.

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Symptoms You May Notice
3 known symptoms for this code
Mirror moves continuously upward or stays in fixed position
Mirror controls unresponsive or erratic movement
Warning light illuminated on dashboard
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the voltage signal from the mirror vertical switch circuit, expecting variable voltage corresponding to switch position. When the circuit shorts to battery voltage, the ECU detects a constant high voltage state instead of the expected variable signal, indicating an electrical fault.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Switch Circuit Voltage 0-5V variable with switch position Constant 12V (battery voltage)
Mirror Motor Response Proportional to input command No response or continuous operation
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness connector
Inspect and reseat the mirror motor connector at the door panel to eliminate poor connections.
2
Mirror switch assembly
Replace the faulty vertical switch control unit located on the driver's door handle area.
3
Mirror motor assembly
Replace the complete mirror motor unit if wiring and switch are confirmed functional.