AutoCodes – Dodge – B1685 Dodge

B1685 Dodge Code - Left Headlamp Leveling Motor Control Circuit Performance

Quick Answer

The Front and Rear Headlamp Level Sensors monitor changes in the relative distance between the vehicle body and the front or rear suspension members. Common causes include Faulty Left Headlamp Leveling Motor, Left Headlamp Leveling Motor harness is open or shorted, Left Headlamp Leveling Motor 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: B1685 Dodge indicates Left Headlamp Leveling Motor Control Circuit Performance.
Common causes: Common causes include Faulty Left Headlamp Leveling Motor, Left Headlamp Leveling Motor harness is open or shorted, Left Headlamp Leveling Motor 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 694

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 Jun 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1685 Dodge Description

The Front and Rear Headlamp Level Sensors monitor changes in the relative distance between the vehicle body and the front or rear suspension members. In vehicles with High Intensity Discharge (HID) Headlamps but without the air suspension system, the sensor circuitry is energized by the Automatic Headlamp Leveling Module (AHLM) and both sensors provide hard wired inputs back to the AHLM. The AHLM uses these sensor inputs as logic for calculating when and how much to adjust the headlamp beams as part of the Automatic Headlamp Leveling feature. The Automatic Headlamp Leveling Module (AHLM) detects a short to voltage, short to ground, or an open on the LIN Lighting circuit.

OBDII Code B1685 Dodge - Left Headlamp Leveling Motor Control Circuit Performance - AutoCodes.com — B1685 Dodge Code - Left Headlamp Leveling Motor Control Circuit Performance

What does this mean?

What are the Possible Causes of the DTC B1685 Dodge?

Faulty Left Headlamp Leveling Motor
Left Headlamp Leveling Motor harness is open or shorted
Left Headlamp Leveling Motor circuit poor electrical connection
Faulty Automatic Headlamp Leveling Module (AHLM)

How to Fix the DTC B1685 Dodge?

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 B1685 Dodge 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 B1685 Dodge Code

1. What does the OBDII code B1685 mean on a Dodge?

The code B1685 refers to a problem with the Left Headlamp Leveling Motor Control Circuit, indicating a performance issue or fault in the circuit.

2. What are the symptoms of a B1685 code on a Dodge?

Common symptoms include the left headlamp failing to adjust its level properly, a warning light on the dashboard, or uneven headlight alignment.

3. What causes the B1685 code to appear?

Possible causes include a faulty headlamp leveling motor, damaged wiring or connectors in the circuit, or a malfunctioning control module.

4. Can I drive my Dodge with a B1685 code?

Yes, but the left headlamp may not aim correctly, which could reduce visibility or cause glare for other drivers. Itâ€™s best to address the issue promptly.

5. How do I diagnose the B1685 code on a Dodge?

Start by visually inspecting the left headlamp leveling motor, wiring, and connectors for damage. Then, use a multimeter to test for proper voltage and continuity in the circuit.

6. How can I fix the B1685 code on my Dodge?

Repairs may involve replacing the left headlamp leveling motor, repairing damaged wiring or connectors, or reprogramming the control module if needed.

7. How much does it cost to fix a B1685 code?

Repair costs depend on the exact issue but typically range from $150 to $400, including parts and labor for replacing the leveling motor or addressing circuit problems.

8. What tools are needed to fix the B1685 code?

Youâ€™ll need a scan tool to read and clear the code, a multimeter to test the circuit, and basic hand tools for replacing components.

9. Can a B1685 code be triggered by a blown fuse?

Yes, a blown fuse in the headlamp leveling system can disrupt the circuit and trigger the B1685 code.

10. Will clearing the B1685 code fix the issue?

Clearing the code without addressing the underlying problem will not fix the issue, and the code is likely to return. Ensure proper diagnosis and repair first.