Body, generic

B0131 A/V Sensor Washer Fluid C Control Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0131 points to the circuit that switches A/V sensor washer fluid C, the third channel of the B012F to B0134 series for autonomous vehicle sensors. Ford's patent US10569746B2 describes a rotating sensor cover: the computer first tries a contactless cleaner with fluid or air and only brings in a wiper when the window's measured opacity stays above a limit. A Korean lab study of lidar windows ran its washer at 0.5 bar and its air jet at 2 bar and found the type of dirt, its concentration and whether it had dried to matter most. No carmaker documents B0131 with this meaning. General Motors lists B0131 among the keywords of bulletin PIP5094 from 2013, which belongs to an older, unrelated numbering. Fault effect: sensor C goes unwashed.

Likely causes

Pump or solenoid valve of channel C with open or shorted winding
Harness to the sensor cleaning unit chafed or pinched at a bracket
Controlling module output for channel C defective

Symptoms

  • Washing of sensor C stops; dirt, salt or insects stay on its window
  • A wiper or air jet, if fitted, has to do the cleaning alone

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–400
Time0.3–2 h

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

Parts involved

av washer fluid pump cpump wiring

Related codes

B012FB0130B0132B0133B0134

References: patents.google.com, pmc.ncbi.nlm.nih.gov, static.nhtsa.gov.