Body, generic

B0335 Driver Seat Heater Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0335 is unsupported by J2012 lists and by service information; its topic duplicates B0341. The circuit is the heating mat in the driver cushion and backrest plus its supply. Real codes elsewhere: Saab's 9-3 climate module stores B2428 01 when the left heater is shorted to battery voltage and B2429 06 for an open left heater; GM's 2011 Saab 9-5 measures current and voltage every 10 s and sets B2425 0B/0D/0E for high current, high or low resistance. Chrysler bulletin 08-049-14 (Wrangler 2011–12) replaced elements whose resistance fell out of range below −12 °C (B1092). Patent US5229579A cuts power on a detected short or open to prevent overheating.

Likely causes

Heating wire in the driver cushion broken by repeated flexing
Seat heater connector under the seat loose or burnt
Element or feed wire shorted to the seat frame
Output stage of the seat heating or climate module defective

Symptoms

  • Driver seat stays cold although heating is switched on
  • Seat heating indicator flashes or goes out after a few seconds
  • Only the backrest or only the cushion warms up

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–700
Time0.5–4 h

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

Parts involved

seat heater elementseat wiring harness

Related codes

B0337B0339B0341

References: saabwisonline.com, saabwisonline.com, saabwisonline.com, static.nhtsa.gov.