U1555
Body Control Module Lost Communication With Left Rear Seat Heating/Venting/Cooling Switch On LIN Bus
U1555 is an OBD-II diagnostic trouble code meaning: Body Control Module Lost Communication With Left Rear Seat Heating/Venting/Cooling Switch On LIN Bus. Common causes: seat heating/ventilation switch malfunction, open or short circuit in lin circuit. Estimated repair cost: $33–167.
Symptoms
- Left rear seat heating/ventilation does not work
- Seat climate control indicator does not light up
- Error message on display
- Intermittent operation of the heating/ventilation function
Causes
- Seat heating/ventilation switch malfunction
- Open or short circuit in LIN circuit
- Poor contact at switch or BCM connector
- Body Control Module (BCM) Malfunction
- Switch power problems
How to Fix
- Check continuity of LIN circuit between BCM and switch
- Inspect connectors for corrosion or damage
- Check power and ground of switch
- Replace faulty heating/ventilation switch
- If necessary, replace or reflash the BCM
Related codes
FAQ
What does the U1555 code mean?
U1555 is an OBD-II diagnostic trouble code that indicates: Body Control Module Lost Communication With Left Rear Seat Heating/Venting/Cooling Switch On LIN Bus
What causes a U1555 error code?
The most common causes of U1555 include: Seat heating/ventilation switch malfunction; Open or short circuit in LIN circuit; Poor contact at switch or BCM connector; Body Control Module (BCM) Malfunction.
How do I fix a U1555 diagnostic trouble code?
To fix U1555: Check continuity of LIN circuit between BCM and switch. Inspect connectors for corrosion or damage. Check power and ground of switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1555?
Yes, but get it checked soon
How much does it cost to fix U1555?
The estimated repair cost for U1555 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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