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B185902 — Motor for head support height adjustment, Signal error

Motor for head support height adjustment, Signal error. The Taycan, 911 (992), Panamera (971), Panamera (972) and Cayenne report this code; below is which control unit sets it on each model and how to read and clear it.

Which models and control units set B185902

Porsche Taycan

Seat Module, DriverSeat Module, Passenger

Porsche 911 (992)

Seat Module, DriverSeat Module, Passenger

Porsche Panamera (971, 2017–2023)

Seat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger Side

Porsche Panamera (972, 2024–)

Seat Module, DriverSeat Module, PassengerSeat Control Module, Rear Driver SideSeat Control Module, Rear Passenger Side

Porsche Cayenne (9YA)

Seat Module, DriverSeat Module, Passenger

How to read and clear B185902

  1. Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
  2. Open STEUER14, pick your car and run a fault scan: every control unit is read, and B185902 shows with its status, its full description and the freeze frame when the unit stores one.
  3. Fix the cause first, then clear the fault memory and scan again to check it stays away. Reading and clearing fault codes is free on every control unit.

More about fault memory in the manual →

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Other codes of the Seat Module, Driver

B185511Sensor for foot support adjustment, Short circuit to ground
B185529Sensor for foot support adjustment, Implausible signal
B185611Sensor for head support height adjustment, Short circuit to ground
B185629Sensor for head support height adjustment, Implausible signal
B185811Sensor for head support length adjustment, Short circuit to ground
B185829Sensor for head support length adjustment, Implausible signal
B185913Motor for head support height adjustment, Open circuit
B18594BHeadrest height adjustment motor, temperature - above limit value
B185954Motor for head support height adjustment, No basic setting
B186002Motor for head support length adjustment, Signal error
B186013Motor for head support length adjustment, Open circuit
B18604BFore-and-aft adjustment motor for headrest, temperature - above limit value

All 222 codes of this control unit →

Fault names come from the manufacturer's diagnostic data. STEUER14 is independent and not affiliated with Porsche AG. A code tells you what a control unit detected, not always which part failed — check wiring, supply voltage and related codes before replacing parts. STEUER14 shows each fault's full description, status and freeze frame on the car.