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03-28-2012, 08:53 PM | #151 | |
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03-28-2012, 09:42 PM | #152 |
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Use a good digital voltmeter and check the voltage on the 4400's amp turn-on wire.
Also, temporarily disconnect that and use your meter to measure how much current everything is drawing (use the meter to complete the circuit from the 4400's blue/white turn-on lead to everything else that you had connected to it. It's possible that the voltage is dropping too low for the car's booster amp to be running properly. It's also possible that you're trying to run too much from the 4400's amp turn-on lead. Pioneer's manual says it's rated for 300 mA max. The car's booster amp draws about 45-50 mA. If you're using one of those huge automotive relays for your brake bypass, those can draw 150-200 mA. Some older speaker amplifiers have a relay inside that does the same. Awhile back, someone found that the Subaru's right-angle Motorola plug did not seat completely in the new HU's socket, causing poor reception. You can either switch to an aftermarket Subaru antenna adapter, or add a short Motorola extension -- both types of cables have a straight Motorola plug. Let us know what you find in case others run into the same problem. |
03-28-2012, 10:10 PM | #153 | |
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03-28-2012, 10:46 PM | #154 |
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I'll check that out with my multi meter the next time I pull my HU.. I bet that automotive relay plus the amp turn on lead is taking too much power.. I might just try hooking it up without the relay to see if I can hear a difference.
Also that relay makes it so you cannot do the setup section where you calibrate the touchscreen which you do from the unit being off, so there's nothing to trip the relay, so the HU thinks the parking brake is off and there's no way to get around it with the HU installed. That's obviosly also why the microphone auto EQ setup won't work with the brake bypass. I wonder if there's a way to safely hook up a relay and a switch so that when the relay doesn't work, you could just toggle a switch to make it work and "override" the relay? |
03-28-2012, 10:50 PM | #155 |
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Thanks for the heads up on my issue with the antenna signal strength. I have been pondering on what you said about the voltage drop and it does make sense to me. There is only 1 issue I have with that and maybe you can clarify for me as I explain what I think. I have a pretty good high powered amp, pacs steering wheel control module and the EQ wired to the amp turn on lead from the head unit. When I bypass the EQ with the rca's and go straight to the amp the fm signal is great, even though the EQ and amp are still powered on from the battery and the turn on lead. I am questioning whether or not the turn on lead has anything to do with the voltage dropping the antenna even though the amp and EQ are all powered from the battery and the turn on lead. Thanks again. Sent a pm but mailbox is full.
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03-28-2012, 11:09 PM | #156 |
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Sorry, I have to leave my PM box full because otherwise I get too many requests for personal "tech support" (from people who haven't bought anything from me) that should be posts in threads.
I agree that simply disconnecting the EQ's audio shouldn't affect the voltage/current on the amp turn-on lead. But who knows, maybe somehow the EQ unit doesn't actually draw anything until it detects signals? Measure everything and find out. While you're at it, you can even measure each device's current draw separately. Maybe your speaker amp is already pushing the 4400 to the edge? I hope you weren't saying the PAC module was connected to the amp turn-on lead (it shouldn't be). Its tiny draw from the +12V Accessory line shouldn't be impacting anything. Added: Right-angle antenna plug issue mentioned here: FM reception issue (blue wires connected) Last edited by SVXdc; 03-28-2012 at 11:18 PM. |
03-29-2012, 07:14 AM | #157 | |
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03-29-2012, 12:25 PM | #158 |
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Yeah I think you can use that, I'm going to get one to see if it works. I think I'm going to hook uo antenna booster power directly to switched power to see if that helps too.
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03-29-2012, 01:53 PM | #159 |
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Great review! I have been doing research for head units for a couple of months now and this thread has convinced me to buy the 4400, I'm pumped.
One thing I was concerned about was if the display brightness could be dimmed during night driving.. just recently I read a review on crutchfield saying that in fact you can dim the display. Can anyone confirm this? Also, has anyone tried out the Motion X app for GPS on this head unit? How well does it work? |
03-29-2012, 01:57 PM | #160 | |
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03-29-2012, 06:39 PM | #161 | |
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Last edited by WRX09MD; 03-29-2012 at 10:37 PM. |
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03-29-2012, 10:32 PM | #162 | |
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03-30-2012, 10:42 AM | #163 |
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I fixed the poor reception on my 3300BT yesterday.
First I went to a local stereo shop and bought a straight antenna plug that connected to the subaru factory harness. It totally replaces the 90 degree antenna lead coming out of dash. That did nothing, but I eliminated that connection as the problem. Next I rewired the antenna signal booster to the switched power lead coming out of the dash. It improved FM reception a huge amount. With a turn on lead for an amp, and the relay for the parking brake bypass, the HU's remote turn on lead does not have sufficient power to run the antenna signal amplifier properly. I didn't measure current draw with multi-meter, I would have if I couldn't fix it though. So that's how you fix the poor reception issue if you are running an amplifier and a parking brake bypass relay. Don't waste your $$ on an antenna cord extension before you try hooking up the antenna amp power lead directly to a switched power source. |
03-30-2012, 11:10 AM | #164 | |
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03-30-2012, 12:08 PM | #165 |
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weird. i have both an amp and a bypass and no reception issues.
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03-30-2012, 12:24 PM | #166 |
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Same here. I have the tiny bypass, though.
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03-30-2012, 01:44 PM | #167 |
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My 4400 in my12 and svx harness soldered up with swc and bypass!
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03-31-2012, 07:08 AM | #168 |
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I have a hand brake bypass that's about 1 inch square or so. Looks like a small automotive relay. It's not thar really small one that I saw on e-bay after I bought this one.
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03-31-2012, 07:13 AM | #169 | |
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03-31-2012, 07:18 AM | #170 |
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Yeah, I know exactly what it is.
http://www.ebay.com/itm/PIONEER-DVD-...33346541767675 Did you read the posts above? Do you know why I said how big it was? |
03-31-2012, 07:31 AM | #171 | |
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You where making a statement, one that seemed involve a question, I was answering said "question"..... something along the lines of "it looks like a small automotive relay" I was backing your STATMENT... |
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03-31-2012, 08:43 AM | #172 |
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Ok, LOL... but yeah... there was a reason I stated that. I was going to quote this: ...but I figured everyone would have read that anyway. I think the difference between the power draw of the larger and smaller brake bypass is the difference between powering the antenna amp properly or not if you're also running an amp.
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03-31-2012, 09:03 AM | #173 | |
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03-31-2012, 02:09 PM | #174 |
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If you ever have occasion to go back in there, I'd be really interested to know how much current each thing draws individually (your amp's remote turn-on and the large bypass relay).
Also, it's worth checking what voltage the Pioneer sends with nothing connected. It's possible that the HU doesn't provide a full 12 Volts and it wasn't sufficient for the car's booster amp even by itself. (I seem to recall someone saying that was the case in another thread). If your amp plus the bypass relay total more than 300 mA (or 250 or whatever the limit spec'd for your particular HU), you could use a double-pole relay for the bypass. Wire one pole to ground the HU's parking brake input. Wire the other pole to provide +12V (from the red Accessory / switched wire) to power the antenna booster, your speaker amp(s), and anything else that needs a remote turn-on. As I mentioned earlier, it can be the smallest relay you can find that has the correct number of contacts (it doesn't need to be capable of switching 30 Amps like the large automotive relays). |
03-31-2012, 10:36 PM | #175 | |
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