AutoCodes – GMC – B3659 GMC

B3659 GMC Code - Head-Up Display Dimming Down Switch Circuit

Quick Answer

The Head-Up Display (HUD) monitors the HUD dimming down switch signal circuit in order to perform the switch functions. Common causes include Faulty Head-Up Display Dimming Down Switch, Head-Up Display Dimming Down Switch harness is open or shorted, Head-Up Display Dimming Down 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: B3659 GMC indicates Head-Up Display Dimming Down Switch Circuit.
Common causes: Common causes include Faulty Head-Up Display Dimming Down Switch, Head-Up Display Dimming Down Switch harness is open or shorted, Head-Up Display Dimming Down 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 454

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 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3659 GMC Description

The Head-Up Display (HUD) monitors the HUD dimming down switch signal circuit in order to perform the switch functions. When the HUD dimming down switch is depressed and the ignition is in the RUN position, the dimming down switch signal to the HUD is low. When the HUD detects that the HUD dimming down switch signal is low for greater than 60 seconds, the Diagnostic Trouble Code (DTC) B3659 sets.

OBDII Code B3659 GMC - Head-Up Display Dimming Down Switch Circuit - AutoCodes.com — B3659 GMC Code - Head-Up Display Dimming Down Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B3659 GMC?

Faulty Head-Up Display Dimming Down Switch
Head-Up Display Dimming Down Switch harness is open or shorted
Head-Up Display Dimming Down Switch circuit poor electrical connection

How to Fix the DTC B3659 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 B3659 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 B3659 GMC Code

1. What are the common symptoms of OBDII code B3659 GMC (Head-Up Display Dimming Down Switch Circuit)?

- The common symptoms include the head-up display not dimming down properly or not responding to the dimming switch.

2. What can cause the OBDII code B3659 GMC to trigger?

- The code can be triggered by a faulty dimming down switch, wiring issues in the circuit, or a malfunction in the head-up display system.

3. How can I diagnose the cause of OBDII code B3659 GMC?

- You can start by checking the dimming down switch for proper functionality, inspecting the wiring for any damage, and testing the head-up display system for any malfunctions.

4. What are some repair tips for fixing OBDII code B3659 GMC?

- Repair tips include replacing the dimming down switch if faulty, repairing any damaged wiring in the circuit, and addressing any issues with the head-up display unit.

5. Can I drive my vehicle with OBDII code B3659 GMC active?

- It is generally safe to drive with this code, but it is recommended to address the issue promptly to ensure proper functioning of the head-up display system.

6. How serious is OBDII code B3659 GMC?

- While not a critical issue for the vehicle's drivability, it can affect the convenience and functionality of the head-up display system.

7. Will resetting the OBDII code B3659 GMC make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue is not fixed, the code is likely to return.

8. Can I fix OBDII code B3659 GMC myself, or do I need a professional mechanic?

- Depending on your experience and tools, you may be able to address this code yourself by following diagnostic procedures and making necessary repairs.

9. How much does it cost to repair OBDII code B3659 GMC at a mechanic's shop?

- Repair costs can vary depending on the labor rates and parts needed, but typically, it may involve replacing a faulty switch or fixing wiring issues.

10. How can I prevent OBDII code B3659 GMC from recurring in the future?

- Regularly inspecting the dimming switch, checking the wiring integrity, and maintaining the head-up display system can help prevent the code from reoccurring.