OBD Guide
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U1520

Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module On LIN Bus

U1520 is an OBD-II diagnostic trouble code meaning: Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module On LIN Bus. Common causes: open or short circuit in the lin bus, seat position memory module malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Seat position memory does not work
  • Seat side support not working
  • Error message on display
  • The seat does not return to the stored position
  • Intermittent operation of seat functions

Causes

  • Open or short circuit in the LIN bus
  • Seat position memory module malfunction
  • Damage to the seat side support module
  • Problems with module power supply
  • Corrosion of contacts in connectors

How to Fix

  1. Check the integrity of the LIN bus between modules
  2. Inspect connectors and contacts for corrosion
  3. Check power supply to memory and seat support modules
  4. Scan other modules for LIN bus errors
  5. Replace the faulty module if necessary

Related codes

U1510U1515U1525

FAQ

What does the U1520 code mean?

U1520 is an OBD-II diagnostic trouble code that indicates: Driver/Passenger Seat Memory Control Module Lost Communication With Driver/Passenger Seat Bolster Memory Control Module On LIN Bus

What causes a U1520 error code?

The most common causes of U1520 include: Open or short circuit in the LIN bus; Seat position memory module malfunction; Damage to the seat side support module; Problems with module power supply.

How do I fix a U1520 diagnostic trouble code?

To fix U1520: Check the integrity of the LIN bus between modules. Inspect connectors and contacts for corrosion. Check power supply to memory and seat support modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1520?

Yes, but get it checked soon

How much does it cost to fix U1520?

The estimated repair cost for U1520 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat