AutoCodes – Buick – B3802 Buick

B3802 Buick Code - Park Lamps Request Circuit

Quick Answer

The Body Control Module (BCM) monitors the park lamp switch on signal circuit and the headlamp switch headlamps on signal circuit in order to determine when the park lamps and headlamps should be illuminated. Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp 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: B3802 Buick indicates Park Lamps Request Circuit.
Common causes: Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp 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 441

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 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3802 Buick Description

The Body Control Module (BCM) monitors the park lamp switch on signal circuit and the headlamp switch headlamps on signal circuit in order to determine when the park lamps and headlamps should be illuminated. When the headlamp switch is turned to PARK, the BCM senses that the park lamp switch signal on circuit is grounded and the headlamps switch headlamps ON signal circuit is open. The BCM will then energize the park lamp relay illuminating the park lamps. When the headlamp switch is turned to HEAD, the BCM senses that the park lamp switch on signal circuit and the headlamp switch headlamps ON signal circuit are grounded. The BCM will then energize the park lamp relay and headlamp low beam relay or high beam relay illuminating the park lamps and headlamps. The Diagnostic Trouble Code (DTC) sets when the headlamp switch park lamps ON signal circuit is open or has a high resistance.

OBDII Code B3802 Buick - Park Lamps Request Circuit - AutoCodes.com — B3802 Buick Code - Park Lamps Request Circuit

What does this mean?

What are the Possible Causes of the DTC B3802 Buick?

Faulty Headlamp Switch
Headlamp Switch harness is open or shorted
Headlamp Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3802 Buick?

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 B3802 Buick 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 B3802 Buick Code

1. What are the common symptoms of OBDII code B3802 Buick related to the Park Lamps Request Circuit?

- The common symptoms include park lamps not turning on or functioning intermittently, or a warning light on the dashboard indicating a lighting system issue.

2. What are the possible causes of OBDII code B3802 Buick for the Park Lamps Request Circuit?

- Possible causes include a faulty park lamp switch, damaged wiring or connectors in the lighting system, a defective body control module (BCM), or issues with the park lamp relay.

3. How can I diagnose OBDII code B3802 Buick for the Park Lamps Request Circuit?

- Diagnose by checking the park lamp switch for proper functionality, inspecting the wiring and connectors for any damage, testing the park lamp relay, and scanning the BCM for fault codes related to the lighting system.

4. What repair tips can help fix OBDII code B3802 Buick for the Park Lamps Request Circuit?

- Repair tips may include replacing a faulty park lamp switch, repairing or replacing damaged wiring or connectors, testing and replacing the park lamp relay if necessary, and reprogramming or replacing the BCM if found to be defective.

5. Can I drive my Buick with OBDII code B3802 related to the Park Lamps Request Circuit?

- It is not recommended to drive the vehicle with this code as it may indicate a problem with the park lamp system, affecting visibility and safety, especially in low-light conditions.

6. How urgent is it to address OBDII code B3802 Buick for the Park Lamps Request Circuit?

- It is important to address this code promptly to ensure the proper functioning of the park lamps for safety reasons and to prevent potential issues with the lighting system.

7. Are there any recalls or technical service bulletins related to OBDII code B3802 Buick for the Park Lamps Request Circuit?

- Check with a Buick dealership or service center for any relevant recalls or technical service bulletins related to this specific OBDII code and lighting system issue.

8. Can a DIY enthusiast fix OBDII code B3802 Buick for the Park Lamps Request Circuit?

- Depending on the root cause, some DIY enthusiasts with automotive repair experience may be able to diagnose and repair this code, but complex electrical issues may require professional assistance.

9. How much does it cost to repair OBDII code B3802 Buick for the Park Lamps Request Circuit?

- The cost of repair can vary based on the specific cause of the code, parts needed for replacement, and labor rates. It is advisable to obtain quotes from reputable repair shops for an accurate estimate.

10. Will resetting the OBDII system clear the B3802 code related to the Park Lamps Request Circuit?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the code is not resolved, it is likely to reappear. It is recommended to diagnose and fix the root cause of the code.