AutoCodes – GMC – B1835 GMC

B1835 GMC Code - Driver Seat Lumbar Rearward Switch Circuit

Quick Answer

The Seat Memory Control Module supplies a reference voltage to each signal circuit of the Driver Seat Adjuster Switch. Common causes include Faulty Driver Seat Adjuster Switch, Driver Seat Adjuster Switch harness is open or shorted, Driver Seat Adjuster Switch circuit poor electrical connection. 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 Driver Seat Adjuster Switch, Driver Seat Adjuster Switch harness is open or shorted, Driver Seat Adjuster Switch circuit poor electrical connection.
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.

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Code Popularity 255

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 24, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B1835 GMC Description

The Seat Memory Control Module supplies a reference voltage to each signal circuit of the Driver Seat Adjuster Switch. When the power seat or lumbar switches are pressed, the appropriate signal circuit from the Seat Memory Control Module is pulled low through the switch contacts indicating the power seat command. The Seat Memory Control Module then commands the driver seat or lumbar to move in response to the switch signals. The Diagnostic Trouble Code (DTC) will be set when there is a short to ground on a switch signal circuit.

OBDII Code B1835 GMC - Driver Seat Lumbar Rearward Switch Circuit - AutoCodes.com — B1835 GMC Code - Driver Seat Lumbar Rearward Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1835 GMC?

Faulty Driver Seat Adjuster Switch
Driver Seat Adjuster Switch harness is open or shorted
Driver Seat Adjuster Switch circuit poor electrical connection
Faulty Seat Memory Control Module

How to Fix the DTC B1835 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1835 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific GMC Models

B1835 2014 GMC Sierra — Driver Seat Lumbar Rearward Switch Circuit
B1835 2015 GMC Sierra — Driver Seat Lumbar Rearward Switch Circuit
B1835 2016 GMC Sierra — Driver Seat Lumbar Rearward Switch Circuit
B1835 2017 GMC Sierra — Driver Seat Lumbar Rearward Switch Circuit
B1835 2018 GMC Sierra — Driver Seat Lumbar Rearward Switch Circuit

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 driverâ€™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 youâ€™re comfortable with basic electrical diagnostics and repairs, you can attempt to fix it yourself. Otherwise, itâ€™s best to consult a professional mechanic.