OBD Guide
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U155D

Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus

U155D is an OBD-II diagnostic trouble code meaning: Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus. Common causes: open or short circuit in lin circuit, seat switch malfunction. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • The right rear seat heating/ventilation does not work
  • Seat function indicator does not light up
  • Error message on display
  • Seat functions may not work correctly

Causes

  • Open or short circuit in LIN circuit
  • Seat switch malfunction
  • Wiring Harness Problems
  • Body control module malfunction
  • Contact corrosion

How to Fix

  1. Check continuity of LIN circuit
  2. Inspect connectors and wiring harness
  3. Check power and ground of switch
  4. Scan other modules on the LIN bus
  5. Replace switch if necessary

Related codes

U155CU155EU155F

FAQ

What does the U155D code mean?

U155D is an OBD-II diagnostic trouble code that indicates: Body Control Module Lost Communication With Right Rear Seat Heating/Venting/Cooling Switch On LIN Bus

What causes a U155D error code?

The most common causes of U155D include: Open or short circuit in LIN circuit; Seat switch malfunction; Wiring Harness Problems; Body control module malfunction.

How do I fix a U155D diagnostic trouble code?

To fix U155D: Check continuity of LIN circuit. Inspect connectors and wiring harness. Check power and ground of switch. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U155D?

Yes, but get it checked soon

How much does it cost to fix U155D?

The estimated repair cost for U155D is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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