Zwerius
Posts: 68
Joined: Sun May 26, 2013 1:07 am
Location: Ootmarsum, The Netherlands
Contact: Website

Re: REX Won't turn on

Wed Sep 19, 2018 10:17 am

Yes I have an update now.
I've got the car back yesterday after 2 weeks (!!) at the dealer.

They exchanged the fuel pump and the relay belonging to the fuel pump.
However this did not solve the problem.

After a long search, they found out, that the relay of the fuel pump is next to another relay.
And although the exchanged the relay for the fuel pump (according to the dealer documentation from BMW and even a BMW instruction movie for the mechanics), it turned out that the relay next to the supposed fuel pump relay, was the actual fuel pump relay.
So the position of the fuel pump relay was wrong in the official BMW workshop documentation and in the BMW-instruction movie for the mechanics!!

So this could very well be the reason that similar problems in oter i3-REX BMW's could not be solved.
Regards,
Zwerius Kriegsman (from Holland)
http://geen-energierekening-meer.weebly.com/index.html

slac10
Posts: 15
Joined: Wed Jun 20, 2018 10:54 am

Re: REX Won't turn on

Wed Sep 19, 2018 2:19 pm

@Zwerius, thank you very much for the feedback! could you scan the paper work or part numbers that needed to be changed that would help my mechanics find or diagnose the problem.

If you can PM me those informations that would be greatly appreciated!

Thank you very much!

Zwerius
Posts: 68
Joined: Sun May 26, 2013 1:07 am
Location: Ootmarsum, The Netherlands
Contact: Website

Re: REX Won't turn on

Thu Sep 20, 2018 1:13 am

@slac10:
Sorry, but I don't have partnumbers or any paperwork.
I just told you what the mechanics told me.
I didn't even see any of the parts. No idea where they are in the car.
Regards,
Zwerius Kriegsman (from Holland)
http://geen-energierekening-meer.weebly.com/index.html

slac10
Posts: 15
Joined: Wed Jun 20, 2018 10:54 am

Re: REX Won't turn on

Mon Nov 05, 2018 12:38 pm

@Zwerius,

It was the fuel pump relay on my car too! Glad you gave me the hint!

I replaced it myself saturday and now it's running fine.

Thanks,

Steve

Polot
Posts: 13
Joined: Thu Jan 05, 2017 9:40 pm
Location: Russia, Stavropol region

Re: REX Won't turn on

Thu Nov 08, 2018 10:30 pm

slac10 wrote:@Zwerius,

It was the fuel pump relay on my car too! Glad you gave me the hint!

I replaced it myself saturday and now it's running fine.

Thanks,

Steve
Where is the fuel pump relay?

slac10
Posts: 15
Joined: Wed Jun 20, 2018 10:54 am

Re: REX Won't turn on

Fri Nov 09, 2018 6:48 am

If you visit this website you find a video showing the exact location of the fuel pump relay behind the glove box.

https://www.newtis.info/tisv2/a/en/i01- ... 1VnXgPAOvC


The easiest way to get to it is to remove the glove box (6 or 7 screws) it is the relay on the right.

Part number: 61366915327

sjjhr
Posts: 10
Joined: Thu Oct 05, 2017 10:30 am

Re: REX Won't turn on

Tue Apr 02, 2019 1:37 pm

-I've had 2 "Drivetrain Errors" intermittently since November 2018 on my Dec 13 REx. 1"you can continue your journey", then always before the end of the journey "electric range only, go to BMW I-service". My local non-BMW garage said there were "HV Cable Resistivity" faults in the stack.

-I took the car to a UK BMW dealer, who replaced the injectors and pre-cat NOx sensor and reprogrammed the car

-the new BMW software is buggy, and causes the charge indicator to get stuck to the left even when accelerating

-the 2 Drivetrain Errors returned

-took it to another BMW dealer who diagnosed fuel pump relay and HV cable

By now, I doubt all BMW dealers because I don't see why replacing the injectors and NOx sensor would cure the HV Cable problem.

We'll see what happens and I hope it's just the relay now.

RJackson
Posts: 1
Joined: Thu Nov 28, 2019 1:37 am

Re: REX Won't turn on

Thu Nov 28, 2019 1:48 am

I had the same issue on my i3. Rex would cut out or not start. Diagnostic tool stated exhaust sensor fault so took it to BMW which was my first mistake. BMW just charged €160 to confirm what a standard OBD2 diagnostic tool with tell you. They wanted a further 7 hours of investigation time at €160 per hour to check some of the sensors and wiring. At that rate I expect BMW to know what the fault is. Anyway I took the car back and did not authorise service. You can check the oxygen sensors easy as the sensor plug is on top of the engine and clearly there was no fault with the sensor. So after typing in the symptoms and reading the helpful information above it's likely a fuel pump relay issue. Sure enough it only €15 on an official BMW fuel pump relay and and it takes approximately 5 minutes maximum to install, so it seems silly not to take a chance and just replace it. Sure enough the engine is running perfectly again now. Had to use beamer code software to reset the engine fault light, as your standard pro torque software doesn't work on the i3.

GeraintB
Posts: 1
Joined: Fri Jan 17, 2020 2:56 am

Re: REX Won't turn on

Sat Jan 18, 2020 1:00 am

Thanks to everyone who suggested a fuel pump relay as the cause of an O2 Sensor fault code.

Our REX petrol engine was reporting a "Drive Chain error" and would not run. On checking with a fault code tester, the Fault code was "O2 Sensor not correctly fitted".

Attempts to run the engine in maintenance mode seemed to suggest it was trying to start (cranking a couple of time) then bring up the fault. AN O2 sensor clearly made no sense.

On reading this forum I purchased a fuel pump relay (the right hand sky blue one; Part number: 61-36-6-915-327). On fitting that, and switching on the car, I immediately heard the fuel pump running for about 3 to 4 seconds.

Oddly when trying the maintenance test on the REX the car reported "battery too much charge" despite it being at about 69%. However, on road testing and switching to 'maintain charge' , all worked just fine.

One point; if you have a right hand drive model (ours is Japanese market model), unless you have multiple joints in your right arm and eyes in your finger tips, you need to expect to get very frustrated trying to replace the relay, as the German design engineers must have been having a laugh when they decided to place them behind the ventilation trunking! I used a mirror to confirm the orientation of the other relay before attempting for the fifth time to aline the new one with its socket.

Nanz1
Posts: 1
Joined: Thu Mar 30, 2017 2:22 pm

Re: REX Won't turn on

Mon Mar 09, 2020 4:14 pm

Thank you all so much for the help.
I too had the same issue as previous posts and I am happy to report this thread saved me an expensive visit to the dealer. True enough it was the fuel pump relay.
Fault codes read the same oxygen sensor issue and mis-firing.
I cleared them using an Veepeak OBD adapter and a free app.
I paid just under £20 for the relay and it took me just over an hour to fit, this included removing the glove box.
My aim now is to fire REX up at least once a week, to keep the relay from sticking.

I am a happy owner once again.

:D

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