Hi fellas, my 2003 3.0 Z4 got the steering light on, no power steering, can't diagnose or communicate with the EPS ecu. I've read here that if the sport button also doesn't work then 100% it's an ECU problem. In my case the SPORT button stays on meaning the LED on the button is lighting, but pressing it doesn't turn it off it just stays ON.
A- So is this what is meant by "SPORT button doesn't work" which means it's an ECU problem? Or could it be something else?
When I delete ALL errors from entire car, all ecus, even though the EPS is dead, and turn ignition ON/OFF the EPS used to work and come back alive, and the power button works (I can turn it off/on by pressing it) and reading the ECU gives no errors.
Then after a few days, it would die and come back alive if I delete errors on GM5 (I'm getting Central Locking Relay errors on GM5).
Then few days when I let the heater on and idle car for a while EPS would come alive but light still on cluster so I cycle KL15 on/off and error would go away.
B- Would updating firmware on EPS solve this issue (tempt the car in any way to catch the moment where eps_e85 would come alive and update the software)?
Current AIF/ZUSB is 6763413 & never changed since 19.02.2003.
I'm trying to avoid breaking my back (bending over backwards to remove the motor), then breaking my wallet (shelling out 300 quid or so, with a possibility of getting unit back and being told oh it's no good get another one, or having it work for a day or so and re-sending only to be told it's no good, or I'm no good, or the torque sensor is no good...etc. as I've read on some threads here).
Thank you.
A- So is this what is meant by "SPORT button doesn't work" which means it's an ECU problem? Or could it be something else?
When I delete ALL errors from entire car, all ecus, even though the EPS is dead, and turn ignition ON/OFF the EPS used to work and come back alive, and the power button works (I can turn it off/on by pressing it) and reading the ECU gives no errors.
Then after a few days, it would die and come back alive if I delete errors on GM5 (I'm getting Central Locking Relay errors on GM5).
Then few days when I let the heater on and idle car for a while EPS would come alive but light still on cluster so I cycle KL15 on/off and error would go away.
B- Would updating firmware on EPS solve this issue (tempt the car in any way to catch the moment where eps_e85 would come alive and update the software)?
Current AIF/ZUSB is 6763413 & never changed since 19.02.2003.
I'm trying to avoid breaking my back (bending over backwards to remove the motor), then breaking my wallet (shelling out 300 quid or so, with a possibility of getting unit back and being told oh it's no good get another one, or having it work for a day or so and re-sending only to be told it's no good, or I'm no good, or the torque sensor is no good...etc. as I've read on some threads here).
Thank you.
Attleborough, Norfolk