AutoCodes – Generic – U1522

U1522 Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Right Headlamp, Right Headlamp harness is open or shorted, Right Headlamp 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: U1522 indicates Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus.
Common causes: Common causes include Faulty Right Headlamp, Right Headlamp harness is open or shorted, Right Headlamp 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 6,378

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 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1522 Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message to the Headlamp Control Module/Headlamp Leveling Control Module from the Right Headlamp has not been received.

OBDII Code U1522 - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus - AutoCodes.com — U1522 Code - Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U1522?

Faulty Right Headlamp
Right Headlamp harness is open or shorted
Right Headlamp circuit poor electrical connection
Faulty Headlamp Control Module/Headlamp Leveling Control Module

How to Fix the DTC U1522?

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 U1522 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.

Need more information about the U1522 code?

Need more information on how to fix the U1522 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1522 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1522 Buick — Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus
U1522 Cadillac — Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus
U1522 Chevrolet — Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus
U1522 GMC — Headlamp Control Module/Headlamp Leveling Control Module Lost Communication With Right Headlamp On LIN Bus

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 U1522 Code

1. What are common symptoms of OBDII code U1522?

- Common symptoms include the right headlamp not functioning properly, headlamp leveling issues, and dashboard warning lights related to headlamp control.

2. What can cause the OBDII code U1522 to trigger?

- This code is typically triggered when the headlamp control module or headlamp leveling control module loses communication with the right headlamp on the LIN bus network.

3. How serious is OBDII code U1522?

- While this code may not affect the drivability of the vehicle, it can impact headlamp functionality and safety, especially at night or in low visibility conditions.

4. How can I diagnose the cause of OBDII code U1522?

- Diagnosing this code often involves checking the connections and wiring related to the right headlamp, headlamp control module, and LIN bus network for any faults or issues.

5. Can I still drive my vehicle with OBDII code U1522?

- It is not recommended to drive the vehicle with this code present, as it can affect the proper operation of the right headlamp and its leveling control, compromising visibility and safety.

6. How can I repair OBDII code U1522?

- Repairing this code may involve resetting the headlamp control module, checking and repairing any damaged wiring or connections, or replacing the headlamp control module if necessary.

7. Is it possible to clear OBDII code U1522 without fixing the issue?

- While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the communication loss to prevent the code from reoccurring.

8. Can weather conditions affect OBDII code U1522?

- Extreme weather conditions or water exposure can potentially damage the wiring or connections related to the headlamp system, leading to the communication loss and triggering the code.

9. How much does it cost to repair OBDII code U1522?

- The cost of repair can vary depending on the extent of the issue, but it may involve labor costs for diagnosis and repair, as well as potential parts replacement if needed.

10. Can a DIY enthusiast fix OBDII code U1522 at home?

- While some basic troubleshooting steps can be taken at home, diagnosing and repairing this code may require specialized tools and knowledge, so it is recommended to consult a professional mechanic for assistance.