B0109: LIDAR Washer Actuator D

What it means

This code identifies a fault associated with LIDAR Washer Actuator D. The code alone does not specify the failure mode.

At a glance

• Usually lights the airbag (SRS) or body-system warning light

How it works

The LIDAR washer actuator D operates the washer mechanism assigned to the vehicle’s LIDAR sensor. The control module monitors its circuit and operation, and stores this code when actuator D or its circuit has a fault; the code does not identify the exact failure mode.

Common causes

Most likely first.

1. Failed LIDAR washer actuator
2. Damaged wiring or connector
3. Open or short in actuator circuit
4. Fault in the washer control module

Symptoms

• Warning light or symbol related to the affected system
• Comfort or safety function impaired

How to diagnose it

1. Scan the relevant body or driver-assistance module for related codes and freeze-frame data to see when the LIDAR washer actuator D fault occurred.
2. Check washer fluid and inspect the LIDAR sensor washer nozzle and plumbing for blockage, leaks, or a seized mechanism.
3. Inspect actuator D’s connector and wiring along its route for looseness, corrosion, water ingress, or physical damage.
4. Use the scan tool’s supported output test to command actuator D and observe whether it operates and whether the fault returns.
5. Test actuator D’s power, ground, and control circuit for opens or shorts, comparing results with the manufacturer’s specification.
6. If the actuator and wiring pass, check the washer control module’s output and connections before considering module failure.

Common fixes

• Top up washer fluid or clear a blocked LIDAR washer nozzle or hose.
• Reconnect or clean the actuator D connector and repair damaged wiring.
• Replace a failed LIDAR washer actuator D.
• Repair the washer control module circuit or replace the module if testing confirms it is faulty.

Can I keep driving?

You can usually drive if the vehicle otherwise operates normally, but keep the LIDAR sensor clean and do not rely on assistance features that may be reduced when its view is obscured. Clean the sensor only as directed by the vehicle maker.