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Old 01-03-2019   #1
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Question Well...I'm stumped!

Well its official. I am stumped .

Hello everyone

My right side indicators have stopped working altogether (dash light as well).
Left side works fine and both work with hazards. Must be the indicator stalk. confirmed by a little different feel for the right switch. I got one from the wreckers. Changed it out fine. Test it and it works very briefly then nothing.

Damn .

Fiddling around with it I notice the indicator works when the high beam is engaged.

WTF .

Considering calling an auto electrician to come and have a look.
Before that I thought to ask you all for suggestions, comments etc.


Few things to consider that might or might not be connected.
1. Back left light had the earth problem. Right one shows no corrosion.
2. Its had a service just before this happened (got it done when I had the windscreen changed for MOT)
3. Little different feel the old indicator stalk had, now feels fine out of the car.


I am at a loss and open to any ideas
Luke
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Old 07-03-2019   #2
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Re: Well...I'm stumped!

even with corrosion on back lights you would still get blinker icon on dash
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Old 08-03-2019   #3
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Re: Well...I'm stumped!

Quote Originally Posted by flisko View Post
even with corrosion on back lights you would still get blinker icon on dash
Yes, dash lights work for left and hazards. Its finally gotten to zero today (been minus 11-15 last few days) so I am headed out to change corroded connector today, then checking earths, hazard switch and continuity around switches.
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Old 1 Week Ago   #4
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Re: Well...I'm stumped!

Hi all.
Can someone offer some advice on testing the body control unit for my punto.
I've (what seems a common problem) with the indicator only working with the highbeams on. From some previous threads and a little testing of earths, switches etc it seems the body control unit is the culprit. I found one company that says it can repair and another company that would clone to a second hand unit, both cost around 200.

I would like to do a final test to check the power from the bcu to the column switch to make sure (as best I can) that the problem is the bcu before I send it away. Also I have had the unit out and open and cant see any obvious damage, so I am not 100% sure.
Ive got a wiring diagram and think I know what wires I am looking for, but a little unsure of how to test the connections when they are plugged in and with power.
Does anyone have any advice?
Thanks Luke
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Old 1 Week Ago   #5
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Re: Well...I'm stumped!

Quote Originally Posted by Luke the duke View Post
Hi all.
Can someone offer some advice on testing the body control unit for my punto.
I've (what seems a common problem) with the indicator only working with the highbeams on. From some previous threads and a little testing of earths, switches etc it seems the body control unit is the culprit. I found one company that says it can repair and another company that would clone to a second hand unit, both cost around 200€.

I would like to do a final test to check the power from the bcu to the column switch to make sure (as best I can) that the problem is the bcu before I send it away. Also I have had the unit out and open and cant see any obvious damage, so I am not 100% sure.
Ive got a wiring diagram and think I know what wires I am looking for, but a little unsure of how to test the connections when they are plugged in and with power.
Does anyone have any advice?
Thanks Luke
The lights are turned on by Earthing the various trigger wires from the BCU so if it were the indicator switch at fault, high beam on would result in less Earth potential for the indicator trigger wire which sounds like an unlikely fault because the best earth for the indicator trigger wire would be with high beam off.


You should be able to locate the colour code of the right indicator wire at the BCU and then Earth it and see what happens but it is sort of looking like the fault is inside the BCU and related to high beam having some influence electronically.


I think a BCU from a Finnish wrecker is 130 Euro. You would need to have the EEPROM from your unit swapped over so there goes your 70 Euros to make 200 Euro.

An annoyingly expensive fault which might be simple to fix if you spend a huge number of hours creating a test rig for the BCU or know where the problem lies in advance of opening the BCU.
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Old 1 Week Ago   #6
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Re: Well...I'm stumped!

Hi judderbar, and thanks for your thought full response. I have changed the column indicator switch as I thought this seemed the logical problem. The only difference it made was the indicator came on briefly (a few seconds) then went off. I thought it was more likely the result of having the battery disconnected.

Am I right in deducing that if the bcu is at fault there wont be an electrical signal from the bcu to the indicator switch? Is this what you mean by earthing the indicator wire? Not entirely sure how to do this, I cant get to the ends of the connectors without disconnecting them. Do u have any suggestions to do this? It seems I am missing something simple :/

Br
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Old 1 Week Ago   #7
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Re: Well...I'm stumped!

Quote Originally Posted by Luke the duke View Post
Hi judderbar, and thanks for your thought full response. I have changed the column indicator switch as I thought this seemed the logical problem. The only difference it made was the indicator came on briefly (a few seconds) then went off. I thought it was more likely the result of having the battery disconnected.

Am I right in deducing that if the bcu is at fault there wont be an electrical signal from the bcu to the indicator switch? Is this what you mean by earthing the indicator wire? Not entirely sure how to do this, I cant get to the ends of the connectors without disconnecting them. Do u have any suggestions to do this? It seems I am missing something simple :/

Br
you can stick pins into the connector parallel to the wires or just stick a pin thru the wire if you cannot get a pin into the connector.

You still need to eliminate a wiring problem between the BCU and the switch. However if you have the same voltage at the switch for both indicator wires which gets similarly pulled down to Earth voltage by the switch that would suggest the wiring from the switch to the BCU is fine.

I see you might be able to get another BCU very cheaply. If the indicators work you would just need to swap the EEPROM - which is a simple job for an electronics technician. No programming is needed it just needs to be unsoldered from the existing one and put on the other.

https://www.varaosahaku.fi/fi-en/Sea...All/?ps_page=8

My one would cost 70 Euro
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Last edited by judderbar; 1 Week Ago at 11:39.
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Old 6 Days Ago   #8
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Re: Well...I'm stumped!

Quote Originally Posted by judderbar View Post
you can stick pins into the connector parallel to the wires or just stick a pin thru the wire if you cannot get a pin into the connector.

You still need to eliminate a wiring problem between the BCU and the switch. However if you have the same voltage at the switch for both indicator wires which gets similarly pulled down to Earth voltage by the switch that would suggest the wiring from the switch to the BCU is fine.

I see you might be able to get another BCU very cheaply. If the indicators work you would just need to swap the EEPROM - which is a simple job for an electronics technician. No programming is needed it just needs to be unsoldered from the existing one and put on the other.

https://www.varaosahaku.fi/fi-en/Sea...All/?ps_page=8

My one would cost 70 Euro
Ha pins! Of course

And great advice I will follow about the voltage test and changing the eprom.
I didnt know any of this, you've taught me alot. Appreciated.

I didnt understand the last line though, are you offering the part, or...?

Either way, first thing is to check the wiring. Then new part and find some one to change the eeprom.
Haha in Finland, not understanding the language that might be the hardest part of all!
Are you Finnish by the way? If not how on earth did you find the part so quickly?!

Thank you very much. I will update here when I know.
Your a champ!
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Last edited by Luke the duke; 6 Days Ago at 20:59.
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Old 6 Days Ago   #9
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Re: Well...I'm stumped!

Quote Originally Posted by Luke the duke View Post
Ha pins! Of course

And great advice I will follow about the voltage test and changing the eprom.
I didnt know any of this, you've taught me alot. Appreciated.

I didnt understand the last line though, are you offering the part, or...?

Either way, first thing is to check the wiring. Then new part and find some one to change the eeprom.
Haha in Finland, not understanding the language that might be the hardest part of all!
Are you Finnish by the way? If not how on earth did you find the part so quickly?!

Thank you very much. I will update here when I know.
Your a champ!
Sorry about the confusion. I am not selling a BCU.

I am not Finnish but I have been buying parts for my car in Finland for about 7 years.

The Finnish Language is a big problem for me. I thought I would pick it up eventually but it is not happening so far.

Another option for you is to buy the full set of locks, ECU and BCU from Ebay UK. Prices were around 100 pounds.
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Old 4 Days Ago   #10
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Re: Well...I'm stumped!

Well. I went to test the wiring today. The haynes wiring diagram shows purple/white and purple/black colour from the bcu. There are no purple wires from bsu to stalk! There are actually no purple wires period, from bsu or fusebox. Any ideas??
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Old 4 Days Ago   #11
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Re: Well...I'm stumped!

Quote Originally Posted by judderbar View Post
Sorry about the confusion. I am not selling a BCU.

I am not Finnish but I have been buying parts for my car in Finland for about 7 years.

The Finnish Language is a big problem for me. I thought I would pick it up eventually but it is not happening so far.

Another option for you is to buy the full set of locks, ECU and BCU from Ebay UK. Prices were around 100 pounds.
I've been in Finland about the same amount of time and my Finnish is non existent. Luckily most people in the south speak english enough to get by. Bloody hard to find anything on the internet still and trying to explain what I need to my wife is like pulling teeth. lovely day today though. Pity about the car
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Old 2 Days Ago   #12
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Re: Well...I'm stumped!

Quote Originally Posted by Luke the duke View Post
I've been in Finland about the same amount of time and my Finnish is non existent. Luckily most people in the south speak english enough to get by. Bloody hard to find anything on the internet still and trying to explain what I need to my wife is like pulling teeth. lovely day today though. Pity about the car
Well the lovely weather continues and I am supposing you can drive around on high beam without it causing too many problems? Does the indicator still work with high beam fuse removed? - I am supposing there is a separate relay for high and low beam. Relays are marked on the engine fuse box cover. Haynes says high beam is relay 1.


I will see what my indicator wiring looks like and see how easy it is to test and report back.
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Last edited by judderbar; 2 Days Ago at 07:38.
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Old 1 Day Ago   #13
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Re: Well...I'm stumped!

I have had similar problems.Sometimes the car will not start, when that happens i have no central locking,windows, fuel gauge .I have had the BCM out.Cleaned all the earths etc.Is there anything else i can check
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