B0841Right Rear Turn Signal Circuit
- Generic OBD-II code · Body
- How the car detects it
- No public record of B0841 exists in J2012 lists, OEM manuals or bulletins. The title refers to the right rear indicator circuit. The second-generation Saab 9-3 logs this lamp in its rear electrical centre as B0525: under 50 mA is treated as open (04), more than 6 A for over 6 ms as a short to ground (02), after which the output is switched off. In both cases the driver sees a message and a doubled flash rate. FMVSS 108 accepts such a change in flash rate as the required failure indication. HELLA recommends checking lamp, holder and plug for corrosion and, on PWM-driven lamps, checking the PWM signal on a scope or scan tool. A dark right rear indicator means turns and lane changes go unannounced to following traffic. Left rear: B0840.
- What you may notice
- Indicators flash at double speed when signalling right
- Right rear indicator does not light, message in the display
- Likely causes
- LikelyRight rear indicator bulb burnt out
- PossibleCorroded contacts in the bulb holder
- PossiblePinched wire shorting to body ground
- RareLamp driver in the rear module faulty
- Repair
- Easy · Often possible to do yourself.Typical cost: €5 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.