Body, generic

B0188 Rear Wiper Motor Circuit

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

B0188 cannot be traced: it appears in no publicly available J2012 list and in no public carmaker material. The rear wiper meaning repeats B0910, titled Wiper Motor Rear Circuit. Bosch describes the part: unlike the front system, the rear wiper has a single arm driven straight off the motor, with sweep angles from 88 to 177 degrees and wiped radii of 250 to 500 mm. Because motor and harness sit in the tailgate, the circuit must cope with hinge flexing and moisture. Audi traced dead or intermittent rear wipers on the 2010–2015 Q5 to corrosion at splice B538 in the motor control circuit; the voltage drop pushed the control signal out of range, and the splice was repaired. With the circuit open or shorted, the rear window stays unwiped.

Likely causes

Wires broken in the rubber boot between body and tailgate after years of opening

Corroded splice or connector in the rear wiper control circuit causing a voltage drop

Rear wiper motor seized, for example from a corroded spindle, or internally shorted

Symptoms

Rear wiper does not move or works only now and then
Rear wiper stops away from its rest position

Repair estimate

DifficultyMediumDIY possible

Parts and labour€30–300

Time0.5–2 h

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

Parts involved

rear wiper motorbody control moduletailgate harness

Related codes

B0910 B0190

References: bosch-mobility.com, static.nhtsa.gov.