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Discussion Starter · #1 ·
Possible to upgrade HU-650 w/ aftermarket HU and retain factory park assist?

<IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> [<I>Just a note regarding the <B>deafening silence</B> this post has drawn since I posted it several days ago. I'd really like to benefit from the collective experience of this forum, but that won't happen unless someone takes the time to respond. Earn yourself some positive karma; give a newbie a hand.</I>]<p>Hi all. This is my first post on Swedespeed, but I've been sulking around the volvoXC.com forums for a while now. I've posted a similar thread on this topic over there, but it doesn't seem anyone has any experience with this issue.<p>I'm gathering my thoughts and materials before I tackle the installation of an upgraded audio system in my recently acquired '06 XC70. I'd only had the new head unit installed in my '01 XC for a couple of months before I decided to trade up to the newer model XC. There are lots of issues to consider: the fabrication of a new hardwood console panel to integrate the Alpine head unit; the fabrication of adapters for the Infinity door speakers; building a custom sub enclosure; placement of the amps, capacitor, etc. I'm actually looking forward to tackling all of that.<p>What has me concerned is the fact that the rear park assist system is integrated with the factory audio system. The display on the head unit gives notice when the system is active, and it really seems to me as if the proximity alert tone is emitting from the right rear door speaker (irrespective of whether or not the audio system is on).<p>Does anyone have knowledge about how deeply the two systems are intertwined? I could ask the guys at the dealership, but experience has taught me not to even bother when anything non-OEM is involved. Crutchfield, helpful as they are, can give me no specific answers. They tell me it's because Volvo plays their cards close to their chest, and is far from helpful with non-Volvo installations.<p>The Alpine head unit (CDA-9857) has an input lead for automatic muting of the audio. It's typically used for a phone system, but I could probably use it for the park assist system if needed. My main concerns are:<p>1) Does the parking assist system rely on any input <I>from</I> the factory head unit in order to properly function?<br>2) Is the alert tone actually coming from the loudspeaker? If so, where/what is the interconnection?<br>3) Will having the AUM disabled allow me to retain use of the park assist? If not, are there known work-arounds?<p>I'm really eager to get this project underway as soon as possible. It's a crime for these components to sit collecting dust on my workbench instead of ruining my hearing as they were intended to do. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"><p>Thanks in advance. I'm glad to be here.<p>-Todd<p><br><i>Modified by dr.tb.xc at 6:00 PM 7-6-2006</i><p><br><i>Modified by dr.tb.xc at 7:15 AM 7-7-2006</i><BR><BR>
<i>Modified by dr.tb.xc at 7:16 AM 7-7-2006</i>
 

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Re: Possible to upgrade HU-650 w/ aftermarket HU and retain factory park assist? (dr.tb.xc)

<IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> <I>Really?</I> There's no one who has anything to say about this topic? I'm surprised.<p>I would greatly appreciate it if someone with relevant experience could help me out here. I don't want to tackle the installation till I know what to do about the park assist system.<p>Thanks again. This is a great forum!<p>-Todd
 

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Re: Possible to upgrade HU-650 w/ aftermarket HU and retain factory park assist? (dr.tb.xc)

disclaimer: I have not had any experience with this so don't expect any truly useful insite. I just have a couple suggestions.<p><br>First off I would talk to mrg_ed. He is really experienced with these systems. He is currently in the processes of marketing an ipod video adaptor that he designed. Also, while your volvo dealer may not be very helpful there are probably others that would be willing to help. There are several people here that have gotten extensive help with their aftermarket systems from their local dealers. You could find these people and then get contact information for their service department. <p>After thinking about this for a while, I still have no clue how this would work or even how to figure out how the backup sensor works. I don't think this is feasible, but, you could try and trace the wires from the sensors to their control unit and then from that to the head unit or the amp or whatever it is connected to. Just an idea...I don't know if it is doable.<p>...Sorry if wasn't what you looking for...just trying to give you a little direction plus I wanted to get my good karma points up a bit <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"> <p>Good Luck,<br>Luke
 

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Re: Possible to upgrade HU-650 w/ aftermarket HU and retain factory park assist? (luke8302)

Thanks for the suggestions, Luke.<p>My local Volvo dealer's service rep gave me the blank stare I was expecting when I asked him for advise on this issue--no surprises there. He did, however, suggest a local car audio installation shop he thought I should contact. Apparently they have experience working on late model Volvos and may have some useful input. I'll talk to them and post the findings later.<p>Currently, my thought is that I may be able to work around the integration problem by purchasing an aftermarket parking system on eBay which has either a stand-alone audio proximity alert or a discreet visual display. I'm thinking I could adapt the leads from the OEM bumper sensors to work with an aftermarket processor, assuming the sensors are fairly standardized.<p>As I said, I'll update my progress (or lack there of) as I find out more, and of course, I'll watch for more suggestions here.<p>Thanks again for responding. Positive karma bestowed. <IMG NAME="icon" SRC="http://********************/smile/emcocktl.gif" BORDER="0"> <p>-Todd
 

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Re: Possible to upgrade HU-650 w/ aftermarket HU and retain factory park assist? (dr.tb.xc)

Hi Doc, I've done some homework in the past about replacing radios and your questions caught my eye. FWIW, I do not have backup assist, or an xc for that matter, but that never seems to stop anyone on the forum <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"> . So, fired up my VADIS disk and also looked at the wiring diagram for an XC90 (I was missing the xc70 page; pm me and I'll send what I have to you).<p>The web page (below) is not crystal clear, but coupled with the other info here's what it means: the parking assist was avaliable in two versions, early (without the accessory electronic module--AEM--and no connection the CANBUS) and later (connected to CANBUS, i.e. your car, xc70's with chassis #'s greater than 003973.<p>Volvo clearly states in VADIS (and presumably VIDA; <A HREF="http://www.volvotechinfo.com" TARGET="_blank">http://www.volvotechinfo.com</A>) that "the audio module (AUM) <i>is required</i> for the reverse warning system to work. I would add: in later model cars...<p>The AEM, which you have, mutes the radio (HU) and provides or triggers the signal that you hear through the loudspeaker. It also tells the HU that the parking assist is on.<p>Volvo's accessories site for the parking assist option: <A HREF="http://acctest.semcon.se/en-GB/P2X/comfort/electronic/VCC-249388.htm" TARGET="_blank">http://acctest.semcon.se/en-GB...8.htm</A>. <p>It is also noted in VADIS that there is a AEM setting (application) for later version cars with aftermarket radios that can read the "reverse warning system" (another name for the parking assist) and generate a +12V mute signal output for the headunit. This sounds like that it is possible to mute the radio when in reverse, but there is no accommodation to generate and communicate parking assist warning signals to the new HU or trigger the sound in a compatible HU--if there was such a thing.<p>So, to sum it up, it looks like if you remove the OEM HU, you will lose the parking assist. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/frown.gif" BORDER="0">
 

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Discussion Starter · #6 ·
Re: Possible to upgrade HU-650 w/ aftermarket HU and retain factory park assist? (MrTippy)

MrTippy,<p>Thanks so much for your reasearch of the topic. I really need to study up on my acronyms so I can make sense of all the info you turned up. CANBUS? No clue here, but it <I>sounds</I> important. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/sly.gif" BORDER="0"> Still, with help from the forum I'm confident I'll be able to pull off the installation and resolve most of the issues I'm concerned about.<p>I'm confused as to why Volvo would apparently have a software download available to set the AEM to mute aftermarket head units (when the park assist system is active) if there's no way to get an audio proximity alert without the factory HU. Sounds like a well intentioned, but half-baked idea from the developers. Is the proximity tone actually generated by the factory HU, the AEM, or the processor for the park assist system. If it's either of the latter two, I'd think it may be possible to patch in an appropriate stand-alone loudspeaker, perhaps with the need for a small amp to power it.<p>I'd still like to try and find a way to maintain function of the factory park assist system if at all possible. Otherwise, I may try to patch the Volvo sensors to an aftermarket park assist system.<p>Thoughts?<p>-Todd
 

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Re: Possible to upgrade HU-650 w/ aftermarket HU and retain factory park assist? (dr.tb.xc)

CANBUS-Controller area network bus. There is a lot of info around swedespeed on this and search the net. It is a digital high and low speed bus (network) for communication between the microcontrollers and servos that control many functions of the car.<p>The HU muting feature is also used for the hands free phone kit (and others?). The software application probably changes how the AEM works when the HU is removed on a parking assist equipped vehicle, i.e. it leaves the mute on, but deactivates any processing of the PAM (parking assist module) signals.<p>I took another look at the ('04) xc70 parts diagram it shows a discrete loudspeaker connector, but no discrete speaker or transducer. Maybe it is connected to one of the nearest sound system loudspeakers (d-pillar?), but I can't find that line in the wiring diagram. You might be able to locate the PAM in your car (behind the passenger side cargo area cover panel near the AEM) and trace the wire, disconnecting the speaker leads to check. <p>However, your '06 may be an all canbus vehicle and have more in common with the xc90 than my car ('04 v70), i.e. the PAM communicates to the AEM and there is no separate speaker or speaker connection for the parking assist signal. Presumably then, the PAM tells the AEM which then tells the HU what noise to make...<p>If you're dead set on this, I suggest you spend a few dollars and download <i>all</i> the wiring diagrams for your car.<br>
 

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Re: Possible to upgrade HU-650 w/ aftermarket HU and retain factory park assist? (MrTippy)

Okay, so now I've educated myself a bit about CANBUS, enough so that I now have an off-topic question to my own thread.<p>Is it CANBUS integration that makes interfacing the steering wheel controls with an aftermarket head unit such a challenge in Volvos? If not, why is it such a pain to maintain the steering wheel controls compared to nearly every other vehicle brand on the market?<p>-Todd
 

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Re: Possible to upgrade HU-650 w/ aftermarket HU and retain factory park assist? (dr.tb.xc)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>dr.tb.xc</b> »</i></TD></TR><TR><TD CLASS="quote">Is it CANBUS integration that makes interfacing the steering wheel controls with an aftermarket head unit such a challenge in Volvos? If not, why is it such a pain to maintain the steering wheel controls compared to nearly every other vehicle brand on the market?</TD></TR></TABLE><p>Volvo's canbus implementation has a fair amount of proprietary character to it; in other words, it has been encoded--this, apparently, is well in character for Volvo. The technology itself is straightforward and largely public (e.g. Bosch), tapping into Volvo's system and decoding what they are doing is not. That said, there is a German company (Dietz) that makes adapters for some of these features when using aftermarket HU's. A few Swedespeeders have tried them with success and they can be obtained in the US.<p>Maybe in time more of this will become accessible, but Volvo is usually last on the list of the aftermarket suppliers as it offers one of the smallest market potentials.<p>This topic has been addressed by Swedespeeders who are more expert at this stuff than I am, search on canbus steering controls, etc and you should pick it up.
 
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