Body, generic

B0910 Wiper Motor Rear Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

A public definition of B0910 is lacking in J2012 extracts as well as in OEM and NHTSA documents. The title refers to the rear window wiper motor circuit. On the second-generation Saab 9-3 the rear electrical centre drives it through a relay and stores B3720: 01 if more than 6 V sits on the output during activation, so the wiper does not work, and 06 if over 6 V is present with the wiper off, where a short to ground makes the wiper run constantly and an open line stops it. In Bosch's rear wiper a single arm is driven directly by a compact drive unit. TI names stall detection and low losses as key requirements for any wiper drive. Unlike the front wiper (B0900) no safety standard prescribes it, so failure is a comfort and visibility issue.

Likely causes

Wire break in the tailgate hinge harness
Rear wiper motor or spindle seized by corrosion
Rear wiper relay faulty
Rear module relay driver faulty

Symptoms

  • Rear wiper does not run when switched on
  • Rear wiper keeps running after switching off

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–350
Time0.3–2 h

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

Parts involved

rear wiper motorbody control module

Related codes

B0900B0188B0920

References: saabwisonline.com, saabwisonline.com, bosch-mobility.com, ti.com.