blown reverse light ends up with gearbox in violent-mode?

[anonymous-user]

Had an interesting one recently where I must have knocked the reverse light bulb when working on the taillights causing that bulb to fail, next time I start the car the EML, ABS and TCS lights are all on but the odd thing was that with headlights on the R indicator (autobox) on the dash was permanently lit (no matter what gear it was actually in) and the gearbox changes become really clunky, enough to jolt the whole car. Headlights off and all was fine again. You could flick the lights on and off and feel the change in the gearbox instantly. Due to R being on I check the reverse light and find it broken, which is fair enough I suppose as a way of letting me know.

Replaced the reverse bulb and clear all the codes and its seemingly all fixed, gearbox smooth again and has been for a few weeks, no more EML etc..

Anyone had anything similar?

R being on I can understand, but the gearbox reverting to caveman-mode seems a bit extreme.

2007 1.8 Avensis automatic btw if that makes any difference.

[annodomini2]

I'd find out which ECU drives the reverse light as it's probably broken, with the current through the reverse light stopping it from failing.

[NotBenny]

JimSuperSix said:

R being on I can understand, but the gearbox reverting to caveman-mode seems a bit extreme.

Gearbox is being told it's in reverse and drive. I would expect it to do things a little differently to prevent it from nuking itself.

[anonymous-user]

NotBenny said:

JimSuperSix said:

R being on I can understand, but the gearbox reverting to caveman-mode seems a bit extreme.

Gearbox is being told it's in reverse and drive. I would expect it to do things a little differently to prevent it from nuking itself.

I suppose it must be something along those lines, but why the super-jerky changes? I'd expect it to failsafe into a very gentle mode or refuse to engage a gear at all, not suddenly decide to shake the whole car, unless it was doing something really dumb like trying to change into reverse when driving, realising it can't and then going into the next forward gear in a big hurry.

Most odd.