Body, generic

B0337 Passenger Seat Heater Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

There is no public trace of B0337 in J2012 lists or factory data; its subject repeats B0342. It covers the passenger seat heating mat and its feed. Because that seat is often empty, a fault may go unnoticed for a long time. Saab's 9-3 climate module reports B2433 01 when the right heater is shorted to battery voltage and B2434 06 for an open or grounded circuit; GM's 2011 Saab 9-5 uses B2430 0B/0D/0E. Chrysler's bulletin 08-049-14 covered both front seats (B1096 on the right). US6252208B1 shows how a control circuit combines heating current and an NTC seat sensor; a broken element or feed simply leaves the passenger seat cold.

Likely causes

Heating wire in the passenger cushion or backrest broken
Connector under the passenger seat kicked loose or corroded
Damage during work on the occupant detection mat in the same cushion
Heater output in the controlling module defective

Symptoms

  • Passenger seat heating does not warm up
  • Heating switches off shortly after activation

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

B0335B0339B0342

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