Body, generic

B0341 HVAC Heated Seat Driver Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0341 is not backed by any known J2012 list or carmaker text, and it covers the same ground as B0335. The HVAC prefix fits cars whose climate control module also runs the seat heaters. Saab's 9-3 is one: its climate module drives the left seat heater and reads a seat temperature sensor; B1927 02 (input below 0.2 V) switches the left heater off, and B2429 06 reports an open element. US6252208B1 shows such a set-up, where an NTC sensor in the seat forms a voltage divider whose tap the controller reads to regulate heating current. The mats are the same as with a separate seat heating module; what differs is the module that owns the output and sets the code.

Likely causes

Driver heating mat open circuit
Seat temperature sensor shorted or open so heating is blocked
Long harness from climate module to seat damaged at the seat rail
Seat heater output in the climate control module failed

Symptoms

  • Driver seat heating dead while climate control works
  • Heating starts but stops after a short time

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–600
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

driver seat heaterheated seat module

Related codes

B0335B0342

References: saabwisonline.com, saabwisonline.com, patents.google.com.