AutoCodes – Cadillac – U1520 Cadillac

U1520 Cadillac Code - Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module 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 Driver/Passenger Seat Bolster Memory Control Module, Driver/Passenger Seat Bolster Memory Control Module harness is open or shorted, Driver/Passenger Seat Bolster Memory 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: U1520 Cadillac indicates Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module On LIN Bus.
Common causes: Common causes include Faulty Driver/Passenger Seat Bolster Memory Control Module, Driver/Passenger Seat Bolster Memory Control Module harness is open or shorted, Driver/Passenger Seat Bolster Memory 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 2,882

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 U1520 Cadillac 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 Driver/Passenger Seat Memory Control Module from the Driver/Passenger Seat Bolster Memory Control Module has not been received.

OBDII Code U1520 Cadillac - Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module On LIN Bus - AutoCodes.com — U1520 Cadillac Code - Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U1520 Cadillac?

Faulty Driver/Passenger Seat Bolster Memory Control Module
Driver/Passenger Seat Bolster Memory Control Module harness is open or shorted
Driver/Passenger Seat Bolster Memory Control Module circuit poor electrical connection
Faulty Driver/Passenger Seat Memory Control Module

How to Fix the DTC U1520 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 U1520 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 U1520 Cadillac Code

What does OBDII code U1520 mean?

OBDII code U1520 indicates that there is a communication issue between the Driver/Passenger Seat Memory Control Module and the Driver/Passenger Seat Bolster Memory Control Module on the LIN bus.

What symptoms might indicate a U1520 code?

Symptoms may include the seat memory functions not working, the seat not adjusting properly, or warning lights related to the seat systems appearing on the dashboard.

What are common causes of the U1520 code?

Common causes include a faulty seat memory control module, issues with the LIN bus wiring or connections, or a malfunctioning bolster memory control module.

How can I diagnose the U1520 code?

Diagnose the U1520 code by checking for additional trouble codes, inspecting the wiring and connectors for damage, and testing the functionality of the seat memory modules.

Can I fix the U1520 code myself?

If you have experience with automotive electronics, you can attempt to fix the U1520 code by inspecting and repairing any damaged wiring or connections. However, replacing modules may require professional assistance.

What tools do I need to troubleshoot the U1520 code?

You will need an OBDII scanner to read codes, a multimeter for electrical testing, and basic hand tools for inspecting and repairing any components.

Is it safe to drive with a U1520 code?

While it is generally safe to drive, the seat memory functions may not work properly, which could affect comfort and safety if the seat is not adjusted correctly.

How much does it typically cost to repair a U1520 code?

Repair costs can vary widely depending on the cause; simple wiring repairs may cost less than $100, while module replacements could range from $200 to $600 or more.

Will clearing the U1520 code fix the problem?

Clearing the code may temporarily reset the system, but if the underlying issue (like a faulty module or wiring problem) is not addressed, the code will likely return.