AutoCodes – Jeep – B1685 Jeep

B1685 Jeep 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 Jeep 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 1,100
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 19, 2019
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Code B1685 Jeep 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 Jeep - Left Headlamp Leveling Motor Control Circuit Performance - AutoCodes.com
B1685 Jeep Code - Left Headlamp Leveling Motor Control Circuit Performance

What are the Possible Causes of the DTC B1685 Jeep?

  • 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 Jeep?

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 Jeep 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 Jeep Code

1. What are the common symptoms of OBDII code B1685 in a Jeep related to the Left Headlamp Leveling Motor Control Circuit?

- Common symptoms include the left headlamp not adjusting properly, erratic headlamp movement, or headlamp leveling system failure.

2. What are some possible causes of OBDII code B1685 in a Jeep for the Left Headlamp Leveling Motor Control Circuit?

- Possible causes can include a faulty headlamp leveling motor, damaged wiring or connectors, a malfunctioning headlamp control module, or a problem with the headlamp leveling sensor.

3. How can I diagnose the issue related to OBDII code B1685 in a Jeep for the Left Headlamp Leveling Motor Control Circuit?

- Diagnosis typically involves checking the headlamp leveling motor, inspecting wiring and connectors for damage, testing the headlamp control module, and verifying the functionality of the headlamp leveling sensor.

4. Is it safe to drive with OBDII code B1685 in a Jeep for the Left Headlamp Leveling Motor Control Circuit?

- It is not recommended to drive with this code unresolved as it can affect the proper operation of the headlamp leveling system, potentially impacting visibility and safety while driving at night.

5. Can I repair OBDII code B1685 in a Jeep for the Left Headlamp Leveling Motor Control Circuit myself?

- Depending on your experience with automotive repair and access to tools, you may be able to address this issue yourself by replacing the faulty headlamp leveling motor, repairing damaged wiring, or troubleshooting the headlamp control system components.

6. How much does it typically cost to fix OBDII code B1685 in a Jeep for the Left Headlamp Leveling Motor Control Circuit?

- The cost of repair can vary depending on the root cause of the issue. It may involve replacing components like the headlamp leveling motor or control module, which can range from $100 to $500 or more including parts and labor.

7. Can resetting the OBDII system clear the B1685 code in a Jeep for the Left Headlamp Leveling Motor Control Circuit?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the fault is not addressed, the code is likely to reappear once the system detects the problem again.

8. How urgent is it to fix OBDII code B1685 in a Jeep for the Left Headlamp Leveling Motor Control Circuit?

- It is advisable to address this code promptly to ensure the proper functioning of the headlamp leveling system, especially if you frequently drive at night or in low-light conditions where properly adjusted headlamps are crucial.

9. Are there any preventative maintenance tips to prevent OBDII code B1685 in a Jeep for the Left Headlamp Leveling Motor Control Circuit?

- Regularly inspecting the headlamp leveling system components for damage, ensuring proper wiring connections, and keeping the headlamp leveling motor clean can help prevent issues that may trigger this fault code.

10. Will OBDII code B1685 in a Jeep for the Left Headlamp Leveling Motor Control Circuit cause the vehicle to fail an emissions test?

- This specific code is related to the headlamp system and should not impact the emissions output of the vehicle. However, it is still recommended to address the issue for safety and proper vehicle operation.

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