Troubleshooting RCAs - Toyota Yaris Forums

CharlieBravo · 01-18-2015, 08:45 PM

So I have 2 amps: one for the 4 cabin speakers (2 front, 2 rear) and one for the sub.

I upgraded the sub amp recently (swapped to higher watts); and when I tested it out, there was no sound from the sub. The cabin speakers were fine.

Light on the amp comes on (indicating power) and I measured ~12.5v (engine off) across the power-ground inputs.

With power to the amp, I pulled the RCAs coming from the HU and inserted a pair coming off my phone (headphone jack to RCA). Sound could be heard from the sub.

I really doubt the RCA cables are bad, since they were working before with the previous sub amp.

So do I need a new head unit or is there something else I can try?

Opinions/comments welcomed!!

Bluevitz-rs · 01-18-2015, 10:35 PM

Make sure the Sub level is turned up if it's hooked up to a sub output on the deck.

IllusionX · 01-19-2015, 07:02 AM

Your cables could have gone bad from pulling out the old amp.

CharlieBravo · 01-19-2015, 07:16 PM

So its not the cables...

HU has 3 sets of RCA outputs: Front, Rear, Sub. I unplugged the Rear set and plugged in the pair from the sub amp. I got sound!

So now its definitely the HU Sub RCA outputs that are bad.

Know how to fix?

Bluevitz-rs · 01-19-2015, 11:47 PM

so you made sure the level is turned up on the sub output?

derickveliz2 · 01-20-2015, 07:32 AM

Did you try to put back your old amp?

D.

CharlieBravo · 01-20-2015, 10:36 PM

Yeah, I made sure the sub level output on the HU was greater than 1 (range is 0-6).

HU is JVC Arsenal KD-A625.

No, I didn't try the old amp.

01-18-2015, 08:45 PM	#1
CharlieBravo Drives: 2007 Yaris HB Join Date: Dec 2011 Location: Florida Posts: 39	Troubleshooting RCAs So I have 2 amps: one for the 4 cabin speakers (2 front, 2 rear) and one for the sub. I upgraded the sub amp recently (swapped to higher watts); and when I tested it out, there was no sound from the sub. The cabin speakers were fine. Light on the amp comes on (indicating power) and I measured ~12.5v (engine off) across the power-ground inputs. With power to the amp, I pulled the RCAs coming from the HU and inserted a pair coming off my phone (headphone jack to RCA). Sound could be heard from the sub. I really doubt the RCA cables are bad, since they were working before with the previous sub amp. So do I need a new head unit or is there something else I can try? Opinions/comments welcomed!!

01-19-2015, 07:02 AM	#3
IllusionX It's the illusion you see View User's Garage Drives: 07 Yaris Sedan Aero Join Date: Oct 2006 Location: Brossard, QC Posts: 3,888	Your cables could have gone bad from pulling out the old amp. __________________

01-20-2015, 07:32 AM	#6
derickveliz2 View User's Garage Drives: Yaris Sedan "S" Join Date: Oct 2008 Location: Central, MA Posts: 2,722	Did you try to put back your old amp? D. __________________ . My system may not blow your ears, but it will sweeten your senses. CLA 250, 4MATIC

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01-18-2015, 10:35 PM	#2
Bluevitz-rs 1NZ-6spd View User's Garage Drives: '05 6-Spd Vitz RS Join Date: Oct 2008 Location: Oshawa, Ontario, Canada Posts: 2,967	Make sure the Sub level is turned up if it's hooked up to a sub output on the deck.

01-19-2015, 07:16 PM	#4
CharlieBravo Drives: 2007 Yaris HB Join Date: Dec 2011 Location: Florida Posts: 39	So its not the cables... HU has 3 sets of RCA outputs: Front, Rear, Sub. I unplugged the Rear set and plugged in the pair from the sub amp. I got sound! So now its definitely the HU Sub RCA outputs that are bad. Know how to fix?

01-19-2015, 11:47 PM	#5
Bluevitz-rs 1NZ-6spd View User's Garage Drives: '05 6-Spd Vitz RS Join Date: Oct 2008 Location: Oshawa, Ontario, Canada Posts: 2,967	so you made sure the level is turned up on the sub output?

01-20-2015, 10:36 PM	#7
CharlieBravo Drives: 2007 Yaris HB Join Date: Dec 2011 Location: Florida Posts: 39	Yeah, I made sure the sub level output on the HU was greater than 1 (range is 0-6). HU is JVC Arsenal KD-A625. No, I didn't try the old amp.