AutoCodes – Cadillac – B0985 Cadillac

B0985 Cadillac Code - Right Headlamp Light Distribution Shutter Control Circuit Malfunction

Quick Answer

Battery positive voltage is applied to the headlamp control module at all times. Common causes include Faulty Right Headlamp Assembly, Right Headlamp Assembly harness is open or shorted, Right Headlamp Assembly 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: B0985 Cadillac indicates Right Headlamp Light Distribution Shutter Control Circuit Malfunction.
Common causes: Common causes include Faulty Right Headlamp Assembly, Right Headlamp Assembly harness is open or shorted, Right Headlamp Assembly 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 823

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 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0985 Cadillac Description

Battery positive voltage is applied to the headlamp control module at all times. The headlamp control module has a normal operational voltage range of about 12.5-16 V and is only fully functional with the ignition switch is in the RUN position and the headlamp switch in the AUTO position. The communications enable signal from the Body Control Module (BCM) wakes the headlamp control module microprocessor. The headlamp control module receives serial data messages from the Engine Control Module (ECM), Transmission Control Module (TCM), Electronic Brake Control Module (EBCM), and BCM with information regarding power mode, speed, steering angle, transmission gear selection, and headlamp switch status. The headlamp control module calculates the headlamp angle and sends commands to the left and right adaptive forward lighting system headlamp actuators. The headlamp actuators drive the headlamps to the position commanded by the headlamp control module. The headlamp control module monitors the headlamp actuator motor control circuits for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a DTC will be stored in memory and the driver will be notified with a message displayed over the driver information center located on the instrument cluster.

OBDII Code B0985 Cadillac - Right Headlamp Light Distribution Shutter Control Circuit Malfunction - AutoCodes.com — B0985 Cadillac Code - Right Headlamp Light Distribution Shutter Control Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B0985 Cadillac?

Faulty Right Headlamp Assembly
Right Headlamp Assembly harness is open or shorted
Right Headlamp Assembly circuit poor electrical connection

How to Fix the DTC B0985 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 B0985 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 B0985 Cadillac Code

1. What are common symptoms of OBDII code B0985 on a Cadillac related to the Right Headlamp Light Distribution Shutter Control Circuit Malfunction?

- Common symptoms include the right headlamp not functioning properly or flickering, warning lights on the dashboard, and issues with the light distribution shutter control.

2. What are possible causes of OBDII code B0985 on a Cadillac?

- Possible causes include faulty wiring or connections in the right headlamp system, a malfunctioning light distribution shutter control module, or a defective headlamp assembly.

3. How can I diagnose the Right Headlamp Light Distribution Shutter Control Circuit Malfunction on my Cadillac?

- Diagnose the issue by checking the wiring and connections in the right headlamp system, testing the light distribution shutter control module, and inspecting the headlamp assembly for any visible damage.

4. Is it safe to drive my Cadillac with OBDII code B0985 indicating a Right Headlamp Light Distribution Shutter Control Circuit Malfunction?

- It is not recommended to drive your Cadillac with this code active, as it may affect visibility and compromise safety while driving at night or in low-light conditions.

5. Can I repair OBDII code B0985 on my Cadillac myself?

- While some basic troubleshooting like checking connections and fuses can be done by DIY enthusiasts, it is recommended to have a professional technician diagnose and repair the issue to ensure proper functioning of the headlamp system.

6. How much does it typically cost to repair OBDII code B0985 on a Cadillac?

- The cost of repairing this code can vary depending on the root cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

7. Will OBDII code B0985 on a Cadillac cause the vehicle to fail an emissions test?

- This code is related to the headlamp system and is unlikely to cause the vehicle to fail an emissions test. However, it should still be addressed to ensure proper functioning of the headlamp system.

8. Can extreme weather conditions affect the occurrence of OBDII code B0985 on a Cadillac?

- Extreme weather conditions like heavy rain or snow can potentially worsen the symptoms associated with this code by causing electrical issues or damage to the headlamp components.

9. Are there any recalls related to OBDII code B0985 in Cadillac vehicles?

- It is recommended to check with the manufacturer or a Cadillac dealership to inquire about any recalls or service bulletins related to OBDII code B0985 in specific Cadillac models.

10. How long does it take to repair OBDII code B0985 on a Cadillac?

- The repair time can vary depending on the exact cause of the issue and the availability of parts. Typically, it may take a few hours to a full day to diagnose and repair the Right Headlamp Light Distribution Shutter Control Circuit Malfunction.