AutoCodes – Mercury – B1D02 Mercury

B1D02 Mercury Code - Left High Beam Circuit Short

Quick Answer

The Steering Column Control Module (SCCM) monitors input from the multifunction and headlamp switches. Common causes include Faulty Left High Beam Bulb, Left High Beam Bulb harness is open or shorted, Left High Beam Bulb 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: B1D02 Mercury indicates Left High Beam Circuit Short.
Common causes: Common causes include Faulty Left High Beam Bulb, Left High Beam Bulb harness is open or shorted, Left High Beam Bulb 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 711

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 Aug 26, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1D02 Mercury Description

The Steering Column Control Module (SCCM) monitors input from the multifunction and headlamp switches. When the headlamp switch is in the HEADLAMPS ON position and the multifunction switch is placed in the HIGH BEAM position, the SCCM sends a message to the Body Control Module (BCM) over the High Speed Controller Area Network (HS-CAN), indicating a high beam request. The BCM then provides voltage to the high beams. The BCM provides an overload protection of the high beam output circuits. When an excessive current draw is detected, the BCM disables the affected high beam circuit driver. The Instrument Panel Cluster (IPC) also receives a message over the HS-CAN to illuminate the high beam indicator when a request for the high beams is received. This Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground or open from the LH high beam output circuit.

OBDII Code B1D02 Mercury - Left High Beam Circuit Short - AutoCodes.com — B1D02 Mercury Code - Left High Beam Circuit Short

What does this mean?

What are the Possible Causes of the DTC B1D02 Mercury?

Faulty Left High Beam Bulb
Left High Beam Bulb harness is open or shorted
Left High Beam Bulb circuit poor electrical connection
Faulty Steering Column Control Module (SCCM)

How to Fix the DTC B1D02 Mercury?

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 does this mean?

Code Tech Notes

B1D02:11 Left High Beam Circuit Short To Ground
B1D02:15 Left High Beam Circuit Short To Battery or Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1D02 Mercury 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 B1D02 Mercury Code

1. What are common symptoms of OBDII code B1D02 in a Mercury related to the left high beam circuit short?

The common symptoms include the left high beam not functioning, flickering or intermittent high beam operation, and a dashboard warning light indicating a fault in the high beam circuit.

2. What are possible causes of OBDII code B1D02 Mercury indicating a left high beam circuit short?

Possible causes include a damaged or frayed wiring harness, a faulty high beam bulb, a malfunctioning headlight control module, or a problem with the high beam relay.

3. How can I diagnose the OBDII code B1D02 Mercury related to a left high beam circuit short?

To diagnose this issue, you can visually inspect the wiring harness for any damage, test the high beam bulb for continuity, check the headlight control module for proper functioning, and test the high beam relay.

4. Can a DIY enthusiast repair the OBDII code B1D02 Mercury indicating a left high beam circuit short?

Depending on the exact cause of the issue, some repairs related to the left high beam circuit short may be DIY-friendly, such as replacing a faulty bulb or a damaged wiring harness. However, more complex issues like a malfunctioning control module may require professional assistance.

5. Are there any safety precautions to consider when dealing with the OBDII code B1D02 Mercury left high beam circuit short?

When working on the high beam circuit, ensure the vehicle is turned off and the high beams are not active. It's also advisable to disconnect the car battery before conducting any repairs to prevent electrical hazards.

6. How can I reset the OBDII code B1D02 Mercury after repairing the left high beam circuit short issue?

After resolving the left high beam circuit short problem, you can reset the OBDII code by using an OBDII scanner or disconnecting the car battery for a few minutes to clear the error code from the vehicle's memory.

7. Will driving with the OBDII code B1D02 Mercury indicating a left high beam circuit short cause any further damage?

Continuing to drive with the OBDII code B1D02 related to a left high beam circuit short may not cause further damage to the vehicle, but it is recommended to address the issue promptly to ensure proper functionality of the high beam system.

8. How can I prevent the OBDII code B1D02 Mercury left high beam circuit short issue from occurring in the future?

Regularly inspecting the high beam circuit for any signs of wear or damage, promptly replacing any faulty components, and ensuring proper maintenance of the lighting system can help prevent the recurrence of the left high beam circuit short problem.

9. Are there any recalls or technical service bulletins related to the OBDII code B1D02 Mercury left high beam circuit short issue?

It's advisable to check with the manufacturer or authorized dealerships for any recalls or technical service bulletins related to the OBDII code B1D02 indicating a left high beam circuit short in your Mercury vehicle.

10. Can a mechanic use a multimeter to diagnose the OBDII code B1D02 Mercury left high beam circuit short issue?

Yes, a mechanic can use a multimeter to measure voltage, continuity, and resistance in the left high beam circuit to diagnose the OBDII code B1D02 indicating a short in the high beam circuit of a Mercury vehicle.