B1827 – OBD-II DTC

OBD-II DTC B1827 – Wiper Rear High Limit Input Circuit Open

DTC B1827 meaning

DTC B1827 refers to a diagnostic trouble code indicating an issue with the rear wiper’s high limit input circuit. This code is triggered when the vehicle’s onboard diagnostic system detects an open circuit in the rear wiper’s high limit switch, which is responsible for signaling when the wiper has reached its maximum operational position. The open circuit can prevent the rear wiper from functioning correctly, leading to potential visibility issues during inclement weather.

DTC B1827 symptoms

Common symptoms associated with DTC B1827 may include:

• Rear wiper not functioning at all
• Intermittent operation of the rear wiper
• Rear wiper operating continuously without stopping
• Dashboard warning lights related to the wiper system illuminated

DTC B1827 causes

Several factors can lead to the triggering of DTC B1827, including:

• Faulty rear wiper motor
• Damaged or corroded wiring in the rear wiper circuit
• Defective high limit switch
• Issues with the vehicle’s body control module (BCM)
• Loose or poor electrical connections

DTC B1827 seriousness

The seriousness of DTC B1827 can vary based on the vehicle’s usage and the environmental conditions. While it may not pose an immediate safety risk, a malfunctioning rear wiper can significantly impair visibility during rain or snow, increasing the risk of accidents. Therefore, it is advisable to address this issue promptly to ensure safe driving conditions.

How to diagnose DTC B1827

To diagnose DTC B1827, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC B1827.
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 high limit switch for proper operation using a multimeter.
5. Examine the body control module for any fault codes or issues.
6. Clear the DTC and perform a functional test of the rear wiper system.

How to fix DTC B1827 step-by-step instructions

To fix DTC B1827, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
2. Inspect and repair any damaged wiring or connectors in the rear wiper circuit.
3. Replace the high limit switch if it is found to be defective.
4. Test the rear wiper motor to ensure it is functioning correctly replace it if necessary.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the rear wiper system to confirm that it operates correctly without triggering the DTC again.

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.