AutoCodes – Generic – B3802

B3802 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 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 3,449

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

What does this mean?

What are the Possible Causes of the DTC B3802?

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?

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 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.

Need more information about the B3802 code?

Need more information on how to fix the B3802 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

B3802 Buick — Park Lamps Request Circuit
B3802 Cadillac — Park Lamps Request Circuit
B3802 Chevrolet — Park Lamps Request Circuit
B3802 GMC — Park Lamps Request 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 B3802 Code

1. What are the common symptoms of OBDII code B3802 (Park Lamps Request Circuit)?

- The common symptoms of code B3802 may include inoperative park lamps, dim or flickering park lamps, or a warning light on the dashboard.

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

- The possible causes of code B3802 can be a faulty park lamp switch, damaged wiring or connectors in the park lamp circuit, or a malfunctioning body control module.

3. How can I diagnose OBDII code B3802 (Park Lamps Request Circuit)?

- Diagnosis of code B3802 involves inspecting the park lamp switch, checking the wiring and connectors for any damage, and using a diagnostic scanner to communicate with the body control module.

4. Can I repair OBDII code B3802 (Park Lamps Request Circuit) on my own?

- While basic troubleshooting like checking the park lamp switch and inspecting wiring can be done by DIY enthusiasts, diagnosing and repairing complex issues with the body control module may require professional help.

5. Are there any tips for fixing OBDII code B3802 (Park Lamps Request Circuit)?

- Some tips for resolving code B3802 include ensuring all connections are secure, replacing any damaged wiring, and resetting the body control module after repairs are made.

6. Can OBDII code B3802 (Park Lamps Request Circuit) cause other issues with my vehicle?

- While the immediate impact may be related to the park lamps, unresolved code B3802 can potentially affect other lighting systems or lead to electrical issues in the vehicle.

7. How urgent is it to address OBDII code B3802 (Park Lamps Request Circuit)?

- It is recommended to address code B3802 promptly to ensure proper functioning of the park lamps for safety reasons and to prevent any further electrical problems in the vehicle.

8. Will resetting the OBDII system clear code B3802 (Park Lamps Request Circuit)?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing B3802 is not fixed, the code is likely to reappear upon detection of the fault.

9. Can extreme weather conditions trigger OBDII code B3802 (Park Lamps Request Circuit)?

- Yes, extreme weather conditions like heavy rain or snow can potentially damage the park lamp circuit, leading to the triggering of code B3802.

10. Is it necessary to replace the park lamp switch to resolve OBDII code B3802 (Park Lamps Request Circuit)?

- Depending on the diagnostic results, replacing the park lamp switch may be necessary to fix code B3802, especially if the switch is found to be faulty during inspection.