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Old 23-08-18, 02:58 PM   #1
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Default Pug 407 OSR Indicator and Brake light not working

Hi,

I have a 407 SW 2ltr diesel on a 2009 plate.

The OSR indicator and brake light keep being switched off by the BSI.

I have sent the car to an auto electrician twice. He's so far re earthed the unit and fitted a replacement plug plus tested voltages/resistance etc and has all come in as expected...

From opening the car and starting the engine the indicator will flash quickly once or twice and then the BSI realises the plug/light fitting is good and switches the indicator back on it then all works as it should. The problem seems to be that if, while driving, I brake and indicate at the same time the BSI will freak out and cut power to both circuits meaning I loose brake light and indicator on the OSR. Get to my destination, Switch the car off, wait 10 mins, switch it on again and we're back to the indicator flashes quickly once or twice and the BSI switches them both on again...

Any thoughts or possible causes/solutions? My auto electrician is one I trust and have used for years but from his experience the new earth and or plug usually solves the problem...

Many thanks in advance.

ED at the weekend I'll to try the BSI re boot procedure listed here https://www.peugeotforums.com/forums...ng-help-15110/ to see if that makes a difference

Last edited by andywise1908; 23-08-18 at 03:00 PM. Reason: added info
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Old 23-08-18, 03:26 PM   #2
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Hi....the only difference I did with mine was to bridge the plug on the earth and brake light feed wires so by passing the plug..I know a new plug seems a good idea but if the fault is in the unit 'prongs' the fault is still there..
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Old 23-08-18, 04:15 PM   #3
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Originally Posted by noddy-hol View Post
Hi....the only difference I did with mine was to bridge the plug on the earth and brake light feed wires so by passing the plug..I know a new plug seems a good idea but if the fault is in the unit 'prongs' the fault is still there..
He did bridge the Earth, I'll add a photo when i get 5. Maybe do the same to the brake and indicator too??
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Old 23-08-18, 04:34 PM   #4
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Hi...those rear light plugs and sockets cause no end of issues...deff bridge out the indicator and earth..its been documented on here and you tube,,,I ended up doing both sides within a year of each other (57 plate sw)....

ps....hoping its that not a b.s.i.water ingress fault/or wiring
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Old 23-08-18, 04:39 PM   #5
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Originally Posted by noddy-hol View Post
Hi...those rear light plugs and sockets cause no end of issues...deff bridge out the indicator and earth..its been documented on here and you tube,,,I ended up doing both sides within a year of each other (57 plate sw)....

ps....hoping its that not a b.s.i.water ingress fault/or wiring
Cheers! Me too!
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Old 23-08-18, 04:51 PM   #6
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Which indicator causes the fault, left / right or both?

Does the same happen with hazard lights flashing?
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Old 23-08-18, 04:54 PM   #7
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Which indicator causes the fault, left / right or both?

Does the same happen with hazard lights flashing?
Only OSR indicator and brake light go off, not tried it with the 4 ways on
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Old 23-08-18, 05:10 PM   #8
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So far it seems the wiring on the OSR rear is at fault. Take the bulbs out and check for any signs of corrosion etc too.

If the fault does not happen with the hazard lights on and brake pedal pressed, then it's not the wiring but something else?

iirc, there have been 3 updates to the BSI in 407's, seeing as your car is 2009, it's most likely got the latest BSI which are pretty reliable.
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Old 23-08-18, 05:17 PM   #9
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mine was fine stationary ....but when driving vibrations cause a brief loss of circuit and the bsi shakes its head,,,lol
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Old 23-08-18, 05:51 PM   #10
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In the OP's case, I am willing to bet it's a break in the wiring somewhere, internally that's not so visible on the outside.
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