technical prob with 406 coupe

[coupetim]

I have recently purchased a 406 coupe and have today come across a problem with the radio and multi function display staying on when the ignition is turned off. I can turn the radio off manually,but I need to sort the problem out can anyone help.

Tim

[504V6Ti]

Hi Tim, I've experienced the same issue on my 2000 V6 Coupé. My problem was worse than yours in that I could NOT turn off the radio manually. It would just stay on and so did the multi-function display and it would take 10 to 15 minutes of multiple engine starts and turn-off before things returned to normal.

I am certain it is a fault with the multiplexing, although when I reported the problem to my dealer, they were unable to do anything about it. Eventually, the problem stopped and I just get the rare occasional re-occurrence now. I hope you have a better dealer than mine, where they could not care less.

The bottom line with our 2nd series Coupé is that the multiplexing system that Peugeot adopted isn't reliable, but Peugeot will not acknowledge this, nor resort to a recall to fix it. It is quite poor customer service for a car at the top of the Peugeot range.

[coupetim]

Hi 504V6Ti,

Thanks for the reply, I have booked the car in at the dealers tomorrow, so hopefully they can fix the problem, I will let you know how I get on.
I was a bit sceptical about all the electrical goodies and how long they would last, I hope this is just a hiccup because the car is great in this spec with the V6.

[504V6Ti]

I don't want to demoralise you but have a look in the "06" section. I've left a post about all the electrical problems I've suffered on my Coupé and they are still happening...

[504gld]

I would agree, its the multiplexing. But where do you start! If you've not come across this term before, its basically a "computer" network in your car. The ECU is the main computer, its job is to control everything. Then other smaller electronics, like the stereo, a/c controls, lighting, instruments etc communicate along this network to and from the ECU.

Power for everything runs on a "ring main" like your house, but is switched on and off by computer signals sent along a seperate command wire from the the ECU.

Multiplexing cuts down on the huge amounts of wire needed for a modern cars loom, and also distributes electrical power more efficently.

Its not without its problems though. Peugeot and Citroen systems have quirks quite well discussed on GSF. Some answers are as basic as a "reboot" by starting and stopping the engine, or disconnecting the ECU cleaning all the pins and reconnecting.

From what I have read, if you remove the stereo, or change it from Peugeot to say Sony you should take it to your dealer and get it hooked up to their computer. They should remove the old stereo from the network (almost like removing a driver from your PC), and then they add your stereo to the ECU.

If you are going to the dealer, I would suggest asking them to hook it up to their computer and remove the stereo driver, and re install it.