AutoCodes – Mercury – B1390 Mercury

B1390 Mercury Code - Ambient Light Control Module

Quick Answer

The Body Control Module (BCM) monitors the Ambient Light Control Module. Common causes include Faulty Ambient Light Control Module, Ambient Light Control Module harness is open or shorted, Ambient Light Control Module 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: B1390 Mercury indicates Ambient Light Control Module.
Common causes: Common causes include Faulty Ambient Light Control Module, Ambient Light Control Module harness is open or shorted, Ambient Light Control Module 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 822

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 Feb 18, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1390 Mercury Description

The Body Control Module (BCM) monitors the Ambient Light Control Module. The BCM sets the OBDII code when the Ambient Light Control Module is not to factory specifications.

OBDII Code B1390 Mercury - Ambient Light Control Module - AutoCodes.com — B1390 Mercury Code - Ambient Light Control Module

What does this mean?

What are the Possible Causes of the DTC B1390 Mercury?

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

How to Fix the DTC B1390 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

B1390:83 Ambient Light Control Module: Value of Signal Protection Calculation Incorrect
B1390:87 Ambient Light Control Module: Missing Message

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1390 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 B1390 Mercury Code

1. What are common symptoms of a B1390 OBDII code related to the Ambient Light Control Module in a Mercury?

- Common symptoms include malfunctioning ambient lighting, erratic behavior of interior lights, and issues with automatic light dimming.

2. What typically causes the B1390 OBDII code to trigger in a Mercury's Ambient Light Control Module?

- The code is often triggered by a fault in the ambient light sensor, wiring issues, or a malfunctioning control module.

3. How can I diagnose the cause of a B1390 code in my Mercury's Ambient Light Control Module?

- A thorough inspection of the ambient light sensor, checking the wiring for any damage, and testing the control module can help diagnose the issue.

4. Are there any simple repairs I can try to fix the B1390 OBDII code in my Mercury?

- Basic repairs include checking and cleaning the ambient light sensor, ensuring all wiring connections are secure, and resetting the control module.

5. Is it safe to continue driving my Mercury with a B1390 OBDII code related to the Ambient Light Control Module?

- While the vehicle may still be operable, it is recommended to address the issue promptly to avoid potential safety hazards or further damage to the lighting system.

6. Can a DIY enthusiast easily fix the B1390 OBDII code in a Mercury's Ambient Light Control Module?

- Depending on the root cause of the code, DIY enthusiasts with automotive repair experience may be able to address the issue by following repair guides or consulting service manuals.

7. How much does it typically cost to repair a B1390 OBDII code in a Mercury's Ambient Light Control Module at a professional repair shop?

- Repair costs can vary depending on the specific cause of the code and labor rates, but the average cost ranges from $150 to $400 for parts and labor.

8. Will resetting the OBDII system clear the B1390 code related to the Ambient Light Control Module in my Mercury?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear after driving the vehicle.

9. Can extreme weather conditions affect the triggering of the B1390 OBDII code in a Mercury's Ambient Light Control Module?

- Yes, extreme temperatures or exposure to direct sunlight can sometimes impact the functionality of the ambient light sensor, leading to the code being triggered.

10. How can I prevent the B1390 OBDII code from recurring in my Mercury's Ambient Light Control Module after repairs?

- To prevent the code from reoccurring, it's essential to ensure proper installation of components, regular maintenance of the lighting system, and addressing any underlying issues promptly.