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Engine-Codes – GMC – B1835 GMC

B1835 GMC Code - Driver Seat Lumbar Rearward Switch Circuit

Quick Answer

The B1835 GMC code indicates a problem with the driver seat lumbar rearward switch circuit in the vehicle. Common causes include Faulty lumbar rearward switch, Wiring issues or loose connections in the circuit, Blown fuse related to the lumbar support system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1835 GMC indicates Driver Seat Lumbar Rearward Switch Circuit.
Common causes
Common causes include Faulty lumbar rearward switch, Wiring issues or loose connections in the circuit, Blown fuse related to the lumbar support system.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code B1835 GMC Description

The B1835 GMC code indicates a problem with the driver seat lumbar rearward switch circuit in the vehicle. The lumbar support feature in modern vehicles allows drivers to adjust the lower back support to their liking, providing comfort and reducing fatigue during long drives. The lumbar rearward switch circuit is responsible for controlling the movement of the lumbar support towards the rear of the seat.

OBDII Code B1835 GMC - Driver Seat Lumbar Rearward Switch Circuit
B1835 GMC Code - Driver Seat Lumbar Rearward Switch Circuit

Common Causes of B1835 GMC

  1. Faulty lumbar rearward switch.
  2. Wiring issues or loose connections in the circuit.
  3. Blown fuse related to the lumbar support system.
  4. Defective lumbar support motor.
  5. Water or moisture damage affecting the circuit components.

Symptoms of B1835 GMC

  1. Inability to adjust the lumbar support towards the rear of the seat.
  2. Lumbar support moving in the wrong direction or getting stuck.
  3. Driver experiencing discomfort or back pain during driving.
  4. Driver struggling to find a comfortable seating position.

How to Fix B1835 GMC

  1. Begin by conducting a visual inspection of the lumbar rearward switch and its wiring for any visible damage or loose connections.
  2. Use a multimeter to test the continuity of the switch and wiring to identify any open circuits or shorts.
  3. Check the fuse related to the lumbar support system and replace if necessary.
  4. Test the lumbar support motor to ensure it is functioning correctly and replace if found to be defective.
  5. Clear the diagnostic trouble codes from the vehicle's system using a scan tool after completing the repair.

Cost to Fix B1835 GMC

The typical repair costs for addressing the B1835 GMC code can vary depending on the specific cause of the issue. In general, the cost of parts for replacing a faulty lumbar rearward switch or motor can range from $50 to $200. Labor costs at auto repair shops typically range from $80 to $150 per hour. The total cost of the repair, including parts and labor, could range from $150 to $500. It is advisable to check with local auto repair shops for more accurate pricing based on your location and vehicle make and model.

What does this mean?

Tech Notes for B1835 GMC









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Information for Specific GMC Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1835 GMC Code

1. What does the OBDII code B1835 mean on a GMC?

B1835 indicates an issue with the driver seat lumbar rearward switch circuit, which may involve a malfunction in the electrical system controlling the lumbar adjustment.

2. What are the common symptoms of code B1835?

Symptoms include the driver’s seat lumbar support not moving rearward, intermittent lumbar adjustment functionality, or no response from the lumbar adjustment switch.

3. What causes the B1835 code to appear on a GMC vehicle?

Common causes include a faulty lumbar switch, damaged wiring or connectors, a malfunctioning lumbar motor, or a short circuit in the lumbar system.

4. How is the B1835 code diagnosed?

Diagnosis involves checking the lumbar switch functionality, inspecting wiring and connectors for damage or corrosion, and using a multimeter to test the circuit for continuity.

5. Can I still drive my GMC with code B1835 active?

Yes, the vehicle is still drivable, but you may lose lumbar adjustment functionality, which could affect comfort during long drives.

6. How do I fix the B1835 code on my GMC?

Repairs can include replacing a defective lumbar switch, repairing or replacing damaged wires, cleaning corroded connectors, or replacing the lumbar motor if necessary.

7. How much does it cost to repair the B1835 code issue?

Repair costs vary depending on the specific issue, but replacing a lumbar switch typically costs $50-$200, while wiring repairs may cost $100-$300.

8. Can the B1835 code clear itself?

No, the code will not clear itself. The underlying issue must be repaired, and the code can then be cleared using an OBDII scanner.

9. Is the B1835 code related to other seat adjustment issues?

While B1835 specifically refers to the lumbar rearward switch circuit, related issues could potentially affect other seat adjustment functions if they share wiring or components.

10. Do I need professional help to fix the B1835 code?

If you’re comfortable with basic electrical diagnostics and repairs, you can attempt to fix it yourself. Otherwise, it’s best to consult a professional mechanic.

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