B1745 – OBD-II DTC

OBD-II DTC B1745 – Mirror Passenger Horizontal Switch Circuit Failure

DTC B1745 meaning

DTC B1745 refers to a fault in the passenger side mirror’s horizontal switch circuit. This diagnostic trouble code indicates that there is an issue with the electrical circuit responsible for controlling the horizontal movement of the passenger side mirror. The problem may stem from a malfunctioning switch, wiring issues, or a failure in the mirror motor itself.

DTC B1745 symptoms

Common symptoms associated with DTC B1745 may include:

• The passenger side mirror does not adjust horizontally.
• Intermittent or complete failure of the mirror adjustment function.
• Warning lights or messages on the vehicle’s dashboard.
• Other electrical issues in the vehicle, particularly related to the mirrors.

DTC B1745 causes

Several factors can lead to the occurrence of DTC B1745, including:

• A faulty passenger side mirror switch.
• Damaged or corroded wiring in the mirror circuit.
• A malfunctioning mirror motor.
• Issues with the vehicle’s body control module (BCM).
• Loose or poor electrical connections.

DTC B1745 seriousness

The seriousness of DTC B1745 can vary. While it may not pose an immediate safety risk, it can affect the driver’s ability to adjust the passenger side mirror, which is important for safe driving. Ignoring this issue may lead to further electrical problems or complications in the vehicle’s mirror system.

How to diagnose DTC B1745

To diagnose DTC B1745, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the passenger side mirror switch for physical damage or wear.
3. Check the wiring and connectors for signs of corrosion or damage.
4. Test the mirror motor for functionality.
5. Examine the body control module for any related fault codes.
6. Perform continuity tests on the circuit to ensure proper electrical flow.

How to fix DTC B1745 step-by-step instructions

To fix DTC B1745, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety.
2. Remove the passenger side mirror switch and inspect it for damage.
3. If the switch is faulty, replace it with a new one.
4. Inspect the wiring harness for any signs of damage or corrosion.
5. Repair or replace any damaged wiring or connectors.
6. Test the mirror motor to ensure it operates correctly replace if necessary.
7. Reconnect the battery and clear the DTC using an OBD-II scanner.
8. Test the mirror adjustment function to ensure it works properly.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.