Body, generic

B0920 Washer Pump Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0920 has no verifiable source: it is absent from J2012 excerpts and from all published service information. The title covers the washer fluid pump circuit. GM's 2011 Saab 9-5 lets the body control module start the pump together with low-speed wiping as soon as washing is requested; with a supply of 9 to 16 V it watches the relay control line, stores B3873 02 on a short to ground and suspends washing. Headlamp washing there is a separate circuit (B3810) and only runs with low or high beam on, then pauses for 4 wash cycles or 48 hours. The 9-3 sets B3873 06 below 6 V on its relay output. FMVSS 104 requires a windscreen washing system on passenger cars, and HELLA describes centrifugal pumps in the reservoir for such systems. Wipers: B0900, B0910.

Likely causes

Washer pump motor seized, often after running dry or freezing
Corroded plug at the pump in the wheel arch
Washer relay or its control line faulty
Relay driver in the body control module faulty

Symptoms

  • No washer fluid sprays when the wash switch is used
  • Washer pump runs continuously
  • Headlamp washers inoperative as well on shared circuits

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–200
Time0.3–1.5 h

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

Parts involved

washer pumpbody control module

Related codes

B0900B0910

References: saabwisonline.com, saabwisonline.com, saabwisonline.com, law.cornell.edu.