Aftermarket radio install question Options

[Xander_X]

So I bit the bullet and bought a double din touch screen unit to replace my factory CD/Cassette ... I'm old, I like using CD's. I really had no problem with the factory set up other than the new unit was shiny and I have a problem with NOT buying things for this car ... even if they're not necessary or even really wanted.

Ok so basically, I've installed a lot of aftermarket stereos in my day but, I've never installed one in a car with a factory amp (all the OEM ones I've replace had the pre-amp built into the unit). I was wondering if I had to do anything different when installing this unit than I would say an other/older import? And do I have to do anything to the unit as the unit has a pre-amp built in and then I'll have the factory one too. I just don't want to either **** up my factory amp or the new unit by frying something. Thanks!

[richee3]

I've had a few head units in a couple of different Celicas with the 6 speaker setup. There was one plug I pulled from the factory amp and the other plug was from the factory head unit. Otherwise, the dash harness adapters do the job perfectly. I believe the head unit draws power from the amp.

[azian_advanced]

This is what you need if you don't want to bypass the oem amplifier.

Metra 70-8112 Integration Harness

otherwise, you can wire the speakers individually using the typical Toyota stereo harness (from Walmart or where ever) and use the built-in amp from the new stereo.

[Special_Edy]

You need to unplug the white plug on the back of the amp, because you need to wire your stereo into this harness. The blue plugs are useless

[Xander_X]

If I bypass the factory amp, and just hook everything up using your basic aftermarket radio harness, will I still have my door tweeters? I've never done this on a vehicle that came with more than 4 speakers. I've ADDED component speakers, but I needed a separate amp for them.

[richee3]

The blue plugs may be useless, but definitely leave them plugged in or find a way to bypass them. Unplug them from the amp and your head unit won't have power.