AutoCodes – GMC – B3642 GMC

B3642 GMC Code - Seat Cooler Switch Circuit

Quick Answer

The seat cool temperature switch is normally open. Common causes include Faulty Heated and Cooled Seat Switch, Heated and Cooled Seat Switch harness is open or shorted, Heated and Cooled Seat 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: B3642 GMC indicates Seat Cooler Switch Circuit.
Common causes: Common causes include Faulty Heated and Cooled Seat Switch, Heated and Cooled Seat Switch harness is open or shorted, Heated and Cooled Seat 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 442

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 Mar 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3642 GMC Description

The seat cool temperature switch is normally open. When the switch is pressed, it momentarily sends a 12-volt signal through the cool temperature switch signal circuit to the Door Control Module. The door module then sends the cooled seat request to the Heated/Cooled Seat Module (CCSM). In response to this signal, the heated/cooled seat module activates the cooled seat mode. If the door module detects that the seat cool temperature switch input circuit is active for 30 continuous seconds, the switch will be considered shorted and the Diagnostic Trouble Code (DTC) will set.

OBDII Code B3642 GMC - Seat Cooler Switch Circuit - AutoCodes.com — B3642 GMC Code - Seat Cooler Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B3642 GMC?

Faulty Heated and Cooled Seat Switch
Heated and Cooled Seat Switch harness is open or shorted
Heated and Cooled Seat Switch circuit poor electrical connection
Faulty Door Control Module

How to Fix the DTC B3642 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3642 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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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 B3642 GMC Code

1. What are the common symptoms of OBDII code B3642 GMC (Seat Cooler Switch Circuit)?

The common symptoms include inoperative seat cooler switch, failure of the seat cooler to turn on, and illuminated dashboard warning light.

2. What are the possible causes of OBDII code B3642 GMC?

The possible causes include a faulty seat cooler switch, wiring issues in the seat cooler circuit, or a malfunctioning seat cooler module.

3. How can I diagnose the OBDII code B3642 GMC?

Diagnosis involves inspecting the seat cooler switch, checking the wiring for any damage or loose connections, and testing the seat cooler module for proper functionality using a diagnostic scanner.

4. Can I still drive my vehicle with OBDII code B3642 GMC?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the proper functioning of the seat cooler system.

5. How can I repair OBDII code B3642 GMC?

Repair may involve replacing the faulty seat cooler switch, repairing any damaged wiring, or replacing the seat cooler module if necessary.

6. Is it possible to reset OBDII code B3642 GMC without repairs?

Resetting the code without addressing the underlying issue may temporarily clear the code, but it is likely to reappear if the root cause is not fixed.

7. Can a DIY enthusiast fix OBDII code B3642 GMC?

Depending on your skill level and access to tools, DIY enthusiasts may be able to address this code by following repair guides or consulting with a professional for assistance.

8. How much does it cost to repair OBDII code B3642 GMC?

The cost of repair can vary depending on the specific cause of the code, the labor rates of the mechanic, and the cost of any replacement parts needed.

9. Are there any preventative measures to avoid OBDII code B3642 GMC?

Regularly inspecting the seat cooler system, avoiding excessive force when operating the seat cooler switch, and addressing any issues promptly can help prevent this code from appearing.

10. Can OBDII code B3642 GMC lead to other problems if left unresolved?

While the immediate impact may be limited to the seat cooler system, leaving this code unresolved could potentially cause electrical issues or affect other components in the vehicle over time.