B0900Wiper Motor Front Circuit
- Generic OBD-II code · Body
- How the car detects it
- Open J2012 material, factory manuals and NHTSA bulletins contain no entry for B0900, so it is unconfirmed. The title concerns the windscreen wiper motor circuit. GM-era Saab models diagnose it at the relays: the 9-3 sets B3874 06 or B3875 06 when the low- or high-speed relay output stays below 6 V, so the wipers stop, run constantly or only at high speed. GM's 2011 Saab 9-5 logs B3715 and B3875 for the relay control lines and B371A when the park-switch signal does not match the switch position. FMVSS 104 asks for two or more speeds: a fast one with 45 or more wipes a minute and a slower one with 20 or more, separated by 15 or more. Bosch supplies brushless and reversing wiper drives; TI names position control with stall detection as a design requirement. Rear: B0910.
- What you may notice
- Wipers do not run, run continuously or only at one speed
- Wipers stop outside the park position
- Poor visibility in rain; do not drive in wet weather until repaired
- Likely causes
- LikelyWiper relay sticking or with burnt contacts
- PossibleWiper motor worn or park switch faulty
- PossibleSeized linkage overloading the motor
- RareDamaged wiring in the scuttle area
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.