New CD player killed my speedo - Renault Forums :: Independent Renault forum

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post #1 of 5 (permalink) Old 18th October 2007 Thread Starter
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New CD player killed my speedo

Yep, thread title says it all. I installed a new CD player in my Laguna (v1) which works great except that when it's on the central area of the dash is dead. That's the milometer, tripometer and speedometer. Turn CD player off and they work again.
All I can think of is that there is no connection on new player for the controls on the steering column and maybe there is a circuit that's broken.
I know very little about electronics - could anyone please advise me on fix for this? I'm sure many Laguna owners must have come across this quirk.

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Last edited by Tangent; 18th October 2007 at 09:56 AM.
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post #2 of 5 (permalink) Old 18th October 2007
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Hi Tangent - was the replacement CD player a like for like replacement or was it a different make and/or model.
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post #3 of 5 (permalink) Old 18th October 2007
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Well the good news is that, as long as the speedo and everything works when the stereo's off, then nothing's permanently broken.

My best guess is that the original stereo takes a pulse from the speed sensor so that it can increase the volume with speed. It sounds like this has been connected to one of the outputs on the new stereo and it's pulling the signal up or down. I'd guess that you've hooked the speed sense into the electric aerial/amplifier remote output on the stereo. If you can find a wiring diagram that shows you which wire is the amplifier remote output, then try disconnecting that one.

I'd have a look at the connections on the power ISO block. You shouldn't really need more than three of them: Power, ignition live and permanent live. Optionally, you might have radio mute and instrument dimming feeds.

Have a look at the diagrams on Parrot France, Actualités kits mains-libres et produits Bluetooth to see what's what on the ISO block. Try it with just the power and ground connections hooked up and see what happens.
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Last edited by Horatio; 18th October 2007 at 06:30 PM.
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post #4 of 5 (permalink) Old 20th October 2007 Thread Starter
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It was a new LG replacing the renault CD player. I did consider a like for like - there was one on ebay but had to get something working very quickly for a series of long trips with my son.

So you're spot on there Horatio. I found this out when I went back to Halfords - a fifty mile round trip (in the wrong direction) just before having to drive back to Edinburgh. The guy who does the fitting there was able to sort the wiring and didn't charge me (he also removed the old CD unit the previous day, saving me the £4.39 for a pair of pins).
At least we had CDs to listen to on the long journey, and I was able to see my speed going past all those cameras on the northern stretch of the A1. I do miss looking at the display on top of the dash though.

I didn't exactly follow along with what the fitter did, but it did seem to be just disconnecting one wire from from the block - I'd hoped he would tellme this over the phone but alas...

Thanks for your replies. I'm surprised this quirk hasn't come up here before, but here we are helping the next person it happens to...

all the best.
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post #5 of 5 (permalink) Old 20th October 2007
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Thanks for the update Tangent .
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