B1826 – OBD-II DTC

OBD-II DTC B1826 – Wiper Rear High Limit Input Circuit Failure

DTC B1826 meaning

DTC B1826 refers to a diagnostic trouble code indicating a failure in the rear wiper high limit input circuit. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components and systems for faults. The rear wiper high limit input circuit is responsible for detecting the position and operational status of the rear wiper motor. When this circuit fails, it can lead to improper functioning of the rear wiper system.

DTC B1826 symptoms

Common symptoms associated with DTC B1826 may include:

• Rear wiper not functioning at all
• Rear wiper operating intermittently
• Rear wiper moving erratically
• Inability to control rear wiper speed or position
• Dashboard warning lights illuminated

DTC B1826 causes

Several factors can lead to the triggering of DTC B1826, including:

• Faulty rear wiper motor
• Damaged or corroded wiring in the rear wiper circuit
• Defective wiper control switch
• Issues with the Body Control Module (BCM)
• Poor electrical connections or grounding issues

DTC B1826 seriousness

DTC B1826 is considered a moderate issue. While it may not affect the vehicle’s overall drivability, it can impair visibility during inclement weather, posing a safety risk. Addressing this code promptly is important to ensure the rear wiper system functions correctly, especially in rainy or snowy conditions.

How to diagnose DTC B1826

To diagnose DTC B1826, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC B1826.
2. Inspect the rear wiper motor and its connections for any visible damage or corrosion.
3. Check the wiring harness for continuity and signs of wear or damage.
4. Test the rear wiper control switch for proper operation.
5. Examine the Body Control Module (BCM) for any faults or software issues.
6. Clear the DTC and perform a functional test of the rear wiper system.
7. Re-scan for DTCs to see if B1826 reappears.

How to fix DTC B1826 step-by-step instructions

To fix DTC B1826, follow these steps:

1. Identify and repair any damaged wiring or connectors in the rear wiper circuit.
2. Replace the rear wiper motor if it is found to be faulty.
3. Test and replace the rear wiper control switch if necessary.
4. Inspect and, if needed, reprogram or replace the Body Control Module (BCM).
5. Ensure all electrical connections are clean and secure.
6. After repairs, clear the DTC using an OBD-II scanner.
7. Test the rear wiper system to confirm proper operation.

How to erase DTC B1826

To erase DTC B1826, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Access the scanner’s menu and select the option to clear or erase DTCs.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to check if the code reappears.

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.