Body, generic

B0841 Right Rear Turn Signal Circuit

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

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.

Likely causes

Right rear indicator bulb burnt out

Corroded contacts in the bulb holder

Pinched wire shorting to body ground

Lamp driver in the rear module faulty

Symptoms

Indicators flash at double speed when signalling right
Right rear indicator does not light, message in the display

Repair estimate

DifficultyEasyDIY possible

Parts and labour€5–300

Time0.2–1.5 h

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

Parts involved

right rear turn signalbody control module

Related codes

B0840 B0831 B0851

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