Subwoofer remote/sense signal sources

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Subwoofer remote/sense signal sources

1S2A1B
I'm installing a little 6" Bazooka powered sub in my 01 9-3. A decade ago I installed it, along with an aftermarket head unit, which included an accessory line, providing 12V to the sub when the head unit was powered on. More recently I put the original stereo back in to work with BlueSaab.

The sub is located in the corner where the CD changer goes, so I was hoping to snag the switched power from the CD changer harness, or the antenna power (not in use since I got my Viggen spoiler from the junkyard ). I learned that both devices have a constant 12v source, even when the car is off. The antenna ground is an open circuit unless it's meant to be running, and I understand the BlueSaab is activated by canbus messages.

Next I spliced into the Antenna Trigger line right from the back of the head unit, as suggested by this guy's SAAB audio site. Unforunately I found that it only has power when on radio.
There is an amplifier trigger line that controls the external amp for the front door speakers. I was recently able to add this amp to my car after another lucky day at the junkyard, but I'm not looking forward to cutting apart the proprietary cable trying to find the wire that goes with the pin.

I'm curious if it would be possible to source the 12v signal from the BlueSaab module. Is there a spot on the board that's got 12v only when the stereo is on, or only when the CD changer is selected?
2001 9-3 base
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Re: Subwoofer remote/sense signal sources

Seth
Administrator
No, there is no such signal on BlueSaab.

Your best bet is to just take the front door speaker amp apart, I believe the pins are labeled as to which is which so you can find the activate signal.

On Mon, Dec 7, 2020 at 08:11 1S2A1B [via BlueSaab Forum] <[hidden email]> wrote:
I'm installing a little 6" Bazooka powered sub in my 01 9-3. A decade ago I installed it, along with an aftermarket head unit, which included an accessory line, providing 12V to the sub when the head unit was powered on. More recently I put the original stereo back in to work with BlueSaab.

The sub is located in the corner where the CD changer goes, so I was hoping to snag the switched power from the CD changer harness, or the antenna power (not in use since I got my Viggen spoiler from the junkyard ). I learned that both devices have a constant 12v source, even when the car is off. The antenna ground is an open circuit unless it's meant to be running, and I understand the BlueSaab is activated by canbus messages.

Next I spliced into the Antenna Trigger line right from the back of the head unit, as suggested by this guy's SAAB audio site. Unforunately I found that it only has power when on radio.
There is an amplifier trigger line that controls the external amp for the front door speakers. I was recently able to add this amp to my car after another lucky day at the junkyard, but I'm not looking forward to cutting apart the proprietary cable trying to find the wire that goes with the pin.

I'm curious if it would be possible to source the 12v signal from the BlueSaab module. Is there a spot on the board that's got 12v only when the stereo is on, or only when the CD changer is selected?
2001 9-3 base



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NAML
NC, USA
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Re: Subwoofer remote/sense signal sources

1S2A1B
Front door speaker amp - top of board

Thanks Seth! Here's a shot of the goods. Per the page linked above, the trigger is supposed to be the center pin of the connector. Seems it's connected to the transistor just in front of the connector. I suppose I'll take it further apart so I can solder a wire to the back side of the board.

2001 9-3 base
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Re: Subwoofer remote/sense signal sources

1S2A1B
Ok, didn't manage to get the board out. This is a nicely built unit, I like the method of thermal contact, and the aluminum body is very thick. I bet these things last a long time if you don't try prying them apart :)
General view of the damage so far:

The nut on the center stud was loctite'd. Nut came off, but the stud is solidly adhered to the board. After more probing, I think the first place the trigger voltage goes is this resistor leg, rather than that transistor. Current plan is to add a wire to that resistor leg, put the amp half way back together, and test it in the car to see if I get 12v when I want it, and that the amp behaves normally. Perhaps tomorrow.
Closeup of stud, resistor, etc
2001 9-3 base
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Re: Subwoofer remote/sense signal sources

1S2A1B
I added a wire to that resistor leg. It's ugly, but it makes good contact. Reassembled and reinstalled. Turned on the stereo, checked voltage on my wire. 6.8V . Unplugged and tested the center pin on the cable to the head unit, 12V. Maybe I should have just peeled open the cable in the first place.

On my way home I decided to try wiring it up anyway, and the sub powers on just fine. Hooray! I suppose 7V is enough for the relay in the Bazooka. I'll do some testing and some crimping and I should be all set. I'll report back if anything interesting happens.
2001 9-3 base