What Does B1744 Mean?
This code indicates the Body Control Module (BCM) has detected a short circuit to ground in the passenger side mirror vertical adjustment switch circuit. The BCM monitors the switch inputs and has identified that the vertical position control signal is reading constant ground potential instead of the expected voltage range during switch operation. This fault prevents proper up/down adjustment of the passenger side mirror.
Common Causes
40%
Damaged or chafed wiring harness in the door jamb area causing short to ground
30%
Faulty passenger mirror switch assembly with internal short circuit
20%
Water intrusion or corrosion in mirror switch connector causing ground fault
10%
Failed BCM internal switch input circuit or driver
Diagnostic Steps
1
Step 1: Perform visual inspection of the passenger mirror switch and associated wiring, looking for obvious damage, corrosion, or moisture intrusion in connectors. Check door jamb area for pinched or chafed wires.
2
Step 2: Disconnect the passenger mirror switch connector and measure resistance between the vertical switch circuit pin and ground with a digital multimeter. Should read open circuit (OL) with switch in neutral position; if reading near 0 ohms, circuit is shorted downstream.
3
Step 3: If switch connector tests open, reconnect and backprobe the vertical switch circuit while operating the switch through all positions. Should see voltage changes (typically 0V, 2.5V, and 5V depending on manufacturer); constant 0V confirms switch internal short.
4
Step 4: Isolate the fault by disconnecting the mirror motor connector at the mirror assembly and re-test the switch circuit. If short clears, fault is in mirror motor or door harness; if short remains, fault is in switch, dash harness, or BCM.
5
Step 5: Using wiring diagram, perform continuity test on suspect circuit from switch through door harness to BCM connector with all components disconnected. Resistance should be less than 5 ohms; use wiggle test on door jamb area while monitoring.
6
Step 6: After repair, clear codes, operate mirror through full range of motion in all directions, and verify DTC does not return. Perform functional test of all mirror positions and memory functions if equipped.
Estimated Repair Cost
$125 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short circuit to ground in the passenger side mirror vertical adjustment switch circuit. The BCM monitors the switch inputs and has identified that the vertical position control signal is reading constant ground potential instead of th...
The most common cause of B1744 (Mirror Passenger Vertical Switch Circuit Short To Ground) is: Damaged or chafed wiring harness in the door jamb area causing short to ground
Typical repair costs for B1744 range from $125 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects mirror adjustment convenience features and does not impact vehicle operation or safety systems. Repair at convenience, though lack of mirror adjustment may create blind spot visibility concerns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1744 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Body
System
Body Electrical System - Power Mirror Control
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
