B1839 – OBD-II DTC

OBD-II DTC B1839 – Wiper Rear Motor Circuit Failure

DTC B1839 meaning

DTC B1839 refers to a diagnostic trouble code indicating a failure in the rear wiper motor circuit. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components to ensure proper functionality. When the rear wiper motor circuit experiences a fault, the vehicle’s computer logs this code to alert the technician of the issue.

DTC B1839 symptoms

Common symptoms associated with DTC B1839 may include:

• The rear wiper not functioning at all.
• Intermittent operation of the rear wiper.
• Rear wiper motor making unusual noises.
• Inability to control the rear wiper from the switch.
• Other electrical issues in the rear of the vehicle.

DTC B1839 causes

Several factors can lead to the triggering of DTC B1839, including:

• A faulty rear wiper motor.
• Damaged wiring or connectors in the rear wiper circuit.
• Corrosion or poor connections at the wiper motor terminals.
• Faulty rear wiper switch.
• Issues with the vehicle’s body control module (BCM).

DTC B1839 seriousness

The seriousness of DTC B1839 can vary based on the vehicle’s usage and the conditions in which it operates. While it may not affect the vehicle’s overall drivability, a malfunctioning rear wiper can impair visibility during inclement weather, posing a safety risk. Therefore, it is advisable to address this issue promptly.

How to diagnose DTC B1839

To diagnose DTC B1839, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1839 code.
2. Inspect the rear wiper motor and its wiring for visible damage or corrosion.
3. Check the rear wiper switch for proper operation.
4. Test the voltage and ground at the rear wiper motor connector.
5. Examine the body control module for any related fault codes.

How to fix DTC B1839 step-by-step instructions

To fix DTC B1839, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect and repair any damaged wiring or connectors in the rear wiper circuit.
3. If the rear wiper motor is faulty, replace it with a new one.
4. Test the rear wiper switch and replace it if necessary.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the rear wiper operation to ensure proper functionality.

How to erase DTC B1839

To erase DTC B1839, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Access the trouble codes menu on the scanner.
3. Select the option to clear or erase codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to verify that the code does not reappear.

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.