What Does B1741 Mean?
This code indicates the Body Control Module (BCM) has detected an electrical fault in the passenger side mirror vertical adjustment switch circuit. The BCM monitors the switch inputs and has identified an open circuit, short circuit, or abnormal voltage reading when the vertical adjustment switch is operated. This prevents proper up/down control of the passenger side mirror.
Common Causes
40%
Faulty passenger mirror vertical adjustment switch with internal open or short circuit
30%
Damaged or corroded wiring between mirror switch and BCM or mirror motor
20%
Faulty mirror motor assembly or internal vertical motor circuit failure
10%
Body Control Module internal circuit failure or water damage affecting mirror control circuits
Diagnostic Steps
1
Step 1: Perform visual inspection of the passenger mirror switch panel for physical damage, loose connections, or signs of liquid intrusion. Check the switch connector for corrosion or bent pins.
2
Step 2: Using a digital multimeter, backprobe the mirror switch connector with ignition ON and test for proper voltage supply (typically 12V or 5V reference) and ground circuits. Operate the vertical switch and monitor for voltage changes on the signal wire.
3
Step 3: Disconnect the passenger mirror connector at the door and check for continuity between the switch and mirror connector on the vertical control circuit wires using a multimeter. Check for shorts to ground or power (should read open circuit when switch is not activated).
4
Step 4: If wiring tests pass, connect a fused jumper wire directly from battery positive to the mirror vertical motor pins (reversing polarity for up/down) to verify motor operation. If motor works, switch is faulty; if motor doesn't work, mirror assembly is faulty.
5
Step 5: Clear the diagnostic code, cycle the mirror switch through all positions multiple times, and rescan for code return. Monitor live data if available to observe switch state changes during operation.
6
Step 6: If all components test good but code persists, perform BCM voltage supply and ground tests, then consider BCM replacement or reprogramming if water damage or internal fault is suspected.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an electrical fault in the passenger side mirror vertical adjustment switch circuit. The BCM monitors the switch inputs and has identified an open circuit, short circuit, or abnormal voltage reading when the vertical adjustment switch is...
The most common cause of B1741 (Mirror Passenger Vertical Switch Circuit Failure) is: Faulty passenger mirror vertical adjustment switch with internal open or short circuit
Typical repair costs for B1741 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving. This is a convenience feature failure that does not affect vehicle operation or safety systems. Repair at your convenience, though proper mirror adjustment is important for visibility and safe lane changes.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1741 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Accessories
Difficulty
Type
Manufacturer
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