Upgrade RD 4 => RD45 + Carplay unit

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jaybee1967
Posts: 2
Joined: 04 Feb 2025, 21:37

Upgrade RD 4 => RD45 + Carplay unit

Unread post by jaybee1967 »

Hi

Hope someone can answer my questions :)

In 2021 I took out my RD4 radio an installed a China HU in my car. It quickly turned out that the radio reception is very poor (I'm still listening to good old FM radio). In January this year I exchanged it with a Pioneer radio. Still the radio reception was not good so I have put my RD4 back .. All good now :)

I have just bought a RD45 + matching screen VIN coded on Ebay for my Peugeot 307CC / 2006 as I wanted to add Handsfree Phone calls via BT. I have thought of adding an extra radio/unit with CarPlay.. so the RD45 will be my radio with BT phone call and then I will have an extra radio/screen with CarPlay.

Unit with CarPlay
ISO connection: https://www.aliexpress.com/item/1005003341099764.html
AUX connection: https://www.aliexpress.com/item/1005006 ... gITqfD_BwE

I have seen that it is possible to buy a T-harness with ISO connectors

https://www.hilmars-audio.dk/shop/t-kab ... 8102p.html
https://phoenixgold-eu.com/product/zdt- ... connector/

So will it be possible to use such a t-harness and connect an aftermarket unit like above and how will it work? Is AUX connection better?

Ie what happen when someone is calling Will it be possible to answer from the CarPlay unit? Can I make calls from this? Will sound be sent to my speakers in stead of the little speaker in the unit?

Hope someone are able to assist me :)

Regards
User avatar
GiveMeABreak
Forum Admin Team
Posts: 41986
Joined: 15 Sep 2015, 19:38
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Re: Upgrade RD 4 => RD45 + Carplay unit

Unread post by GiveMeABreak »

You can’t have more than one unit connected.

Aux is only a stereo audio input and nothing else. You cannot control tracks or do anything else with Aux connection like change tracks skip forwards and backwards. It is an old interface for older tech to output audio only from devices like music players.
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Marc