AutoCodes – Cadillac – B3802 Cadillac

B3802 Cadillac 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 Cadillac 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 607

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

What does this mean?

What are the Possible Causes of the DTC B3802 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

What does the OBDII code B3802 signify for a Cadillac?

B3802 indicates a fault in the Park Lamps Request Circuit, which may suggest an issue with the system that controls the vehicle's park lamps.

What are the common symptoms associated with the B3802 code?

Common symptoms include malfunctioning park lamps, dash indicator lights not illuminating, or unexpected behavior of the lighting system.

What could cause the B3802 code to trigger?

Causes may include a faulty park lamp switch, damaged wiring or connectors, a malfunctioning body control module (BCM), or issues with the park lamp bulbs themselves.

How can I diagnose the B3802 code?

Start by checking the park lamp switch for proper function, inspect wiring and connectors for damage, and test the park lamp bulbs. Using a multimeter can help assess electrical continuity.

What are some potential repairs for the B3802 code?

Repairs may involve replacing a faulty park lamp switch, repairing damaged wiring, replacing the BCM, or replacing burnt-out bulbs.

Can I drive my Cadillac with the B3802 code active?

While it's possible to drive the vehicle, it is advisable to address the issue to ensure proper lighting functionality and to avoid potential safety hazards.

Is the B3802 code specific to certain Cadillac models?

This code can appear in various Cadillac models, typically from the 1996 model year onward, but always check the specific vehicleâ€™s repair manual for details.

Do I need special tools to fix the B3802 code?

Basic tools like a multimeter, socket set, and possibly a scan tool for reading codes may be required, depending on the specific repairs needed.

Will clearing the B3802 code solve the problem?

Clearing the code might temporarily turn off the warning light, but if the underlying issue isn't fixed, the code will likely return. Always diagnose and repair the root cause.