I'm trying to add a manual switch to the power antenna of an 850R with the sc-815 radio. Does anyone have the correct wiring diagram?

The closest diagram I found was for the sc-816 in the s/v 70,

http://au.geocities.com/ozbrick850/Radio_Connectors.html

but there were some differences when compared to the sc-815 in the 850R.

In the 850R the speaker wires are not attached to the headunit, instead, they went through a DIN cable that was plugged into the AMP socket in the headunit. I'm not sure whether the power antenna wire is still wire#3 on the large-14pin-connector, does that wire also operates as the remote turn-on for the amp? Again, I'm trying to wire a manual power antenna switch so need to know if that is the only wire I would be dealing with.

Please post response to the board. Thanks in advance!

Ola, first of all, the diagram you saw on ozbrick850 site is for the 815/811 unit. I know because I am the one who submitted it. The reason your speaker wires go into the amp is because you have an amp. The non-speaker related wires are the same. I have to agree that you are better off buying an OEM harness for this, but I have done without one because I could not find it at the time (I think it only became available recently). If you look at the wiring diagram you'll see that pin 3 on connector A is the antena pin. Just put a circuit breaker (switch) into that wite and you are done. I must say that I am thinking of upgrading to the OEM style for the uniform look and backlighting.

Good luck and email if you need more help.

Vladimir,

The OEM switch is AVAILABLE! I bought one from the dealership and you'd have to tell them that you want it for a 1998 S90 otherwise they won't be able to find it. As for the switch, it's just that alone, no back end harness so you'll have to solder wires to it.

I'm going to try to tinker with it this afternoon, hope it works out.

Thanks for posting the diagram.

I know that the switch exists now. I even have the part number.

Aerial Down Switch Kit - PN 9204656

I got this info from BB and I believe the person who provided it said that this particular part number includes the harness. Just plugs into your radio in the back. I haven't verified it yet, since I arleady have a home-grown solution that works. It is just a matter of appearance for me at this point.

Thanks for the S90 tip, though.

I agree with John. For 30 dollars get the oem harness and switch. But if your a DIY'er and just enjoy tinkering, this may help http://www.volvospeed.com/Repair/radiocon.htm Good luck

I don't know which exact wire does that but you have 2 choices, either buy the OEM wiring manual for your car from Volvo (1-800-25-volvo) or remove the panel on the LR side or your trunk and disconnect one wire at a time (cut/re-splice if need be, NOT the DIN harness) until you find which wire de-activates the motor. Then either wire the switch back there or trace the wire to where it goes into the radio.