Peugeot 406 Coupe EV conversion

Talk about the 406's electrical system, what wires do what, how to add extra functionality, etc.

Moderator: Moderators

2.2 16v
Posts: 206
Joined: Sun Aug 24, 2014 12:18 pm
Location: Netherlands

Re: Peugeot 406 Coupe EV conversion

Post by frog » Wed Sep 12, 2018 11:31 am

I really think it is a timer. 12.2 Volt is not a depleted battery. I've seen lower voltages on my battery, but the timeout is always around those 30 minutes (on my model, that is).
Current "fleet":
2003 406 Estate 2.0HDi 110 - 7 seater
2001 Citroen Saxo 1.6i 8v 100

Previously owned:
2000 406 Sedan 2.0 HDi 90
2000 406 Coupé 2.0i 16v 138 - Riviera Blue

PP2000 user, can help with faults / diagnostics in the Netherlands.

1.6 8v
Posts: 11
Joined: Wed May 09, 2018 10:02 am

Re: Peugeot 406 Coupe EV conversion

Post by arber333 » Sat Sep 15, 2018 11:32 am

Yes :shock:

I tried to up the voltage and it still shut down on me after 30min. And i ant restart it just by starter cranking. It has to have ignition.
I have a friend that converted Citroen C2 and he had to input 11111... to BSI register to have 4000years between ECO mode trigger :lol: . Does anyone have the EEPROM position of eco mode timer on 406?

Also i would like to try to put 14V on alternator excite input. It is difficult to access alternator without dissassembly. Since i cant drive my car to a shop i need to try everything insitu before i take it there. Do you know where the wire goes?


1.6 8v
Posts: 11
Joined: Wed May 09, 2018 10:02 am

Re: Peugeot 406 Coupe EV conversion

Post by arber333 » Tue Oct 16, 2018 8:56 am

Anyone knows about "Showroom mode"? How to activate it?


1.6 8v
Posts: 11
Joined: Wed May 09, 2018 10:02 am

Re: Peugeot 406 Coupe EV conversion

Post by arber333 » Fri Jun 21, 2019 12:29 pm

Luckily i found a wire connected to alternator +12V supply. Whenever this is connected to 12V a group of relays comes on and everything in the car starts to work! Hurah! That is one single thing that enables me to start using the car as is.

ATTENTION! So i confirm this wire is the 12V signal to BSI to let the cabin systems work even though the motor IS NOT working. I think this is the way to hack your car so the stereo and internal system woul work from the battery. I will post some photos of the wire even though the loom was dissassembled from the engine. Main thing is this wire was connected to alternator contact, so it supplied 13V only when engine was working.

There is a missing link however. RPM indicator doesnt want to react to my prodding. I tried 58 pulses and it didnt work. I will need to simulate correct pulse timing if i want to wake up RPM AND some other functions that depent on it.

Speedo i noticed has a reference to RPM/KM. RPM of exit shaft is 1.3x of car speed it seems.
I will just make a circuit that i will feed motor RPM and divide that by 8 and again multiply by 1.3.

3.0 24v
Posts: 1485
Joined: Sun Mar 04, 2012 7:04 pm
Location: Charmouth, Dorset

Re: Peugeot 406 Coupe EV conversion

Post by PeterN » Sat Jun 22, 2019 10:58 am

I have done a number of diesel conversions over the years but I think they would have been a doddle compared with the one you are planning. I was an electronics engineer for 50 years but I wouldn't tackle it, mind you it was all analogue and valves then, don't understand this digital stuff. I wish you success and hope you will keep us posted.


User avatar
Posts: 19186
Joined: Thu Oct 04, 2007 6:09 pm
Location: Jastrebarsko, Croatia

Re: Peugeot 406 Coupe EV conversion

Post by steve_earwig » Sat Jun 22, 2019 11:12 am

Yes, please do keep us updated, it's all interesting and I hope you manage to get it all figured out without turning grey.

Sorry there's not been much response to your questions, it's just you are well outside the forum's comfort zone :shock:
Unskilled meddling sin©e 2007

2004 D9 2.0 HDi 110 Estate lhd VF38ERHZF81657352 - sold but being very well looked after.
1991 Yamaha TDM850 - fuel leaks galore!
2008 Toyota Recall4 2.0 VVTI ATM LHD JTMBH31V90D007261 - flimsy piece of crap.
1953 Matchless G3LS - It's alive!!

Post Reply