New stereo and factory amp bypass

[fj62max]

Disconnect the amp if you haven't already and if your unit is running hot then you have a bad earth/ground. The antenna cable should give you adequate earth but i ran additional black earth cable from the side of the HU to a decent point on the dash for extra earth. One thing i noticed on mine is there were two antenna cables and one provided a better ground (improving the clarity of sound 150% ) have a look and see if you also have two cables and do a test with the HU out of its mounting hole to test for overheating and sound quality improvement when swapping antenna cables

I found out what happened one of my rear speakers was grounded out. Woo hoo. Thank god. I didnt have to remove my dadh again!

 

[revelario]

My factory stereo was seriously lacking in performance in my 1995 Land Cruiser so I decided to upgrade to a Kenwood DDX371 Touch screen unit. I purchased the Metra 70-8112 Harness to connect the new stereo harness to the factory harness (white connector) behind the stereo. I drove it for about a week in this configuration but the new sound wasn't what I was expecting, so off to Mud to find a solution! I read through many different threads saying to bypass or remove the factory amp in order to let the new stereo power the speakers. I decided that this was the solution to getting it to sound better. The threads stated that I needed to get a different harness other than the Metra 70-8112. This new harness was the Scosche TA02B. In most of the threads it stated that I needed to add 20" of wire to extend it from the back of the new stereo to the amp location near the passenger right knee. I can follow instruction good enough so that's exactly what I did, however once I routed this harness and tried to plug into the male connectors that came off the amp, it was a no go, they didn't fit! Off to Mud again to figure out where I went wrong. I noticed in a lot of the pics that some rigs have 3 connections at the amp where I only had 2. Could this be the difference between the Land Cruiser and the LX? I don't know but it didn't work. I stumbled upon a thread that said to connect this harness to the 2 gray (previously unused) connectors behind the stereo. It worked and sounded much better too! Problem solved! Hope this helps someone else.

I wanted to post this because I found some of the threads very confusing and in my case not accurate for my application. Over all I'm happy with the set up, however the screen does have a glare issue. Another odd thing, my front door speakers do not work in any of the configurations but the little dash ones do...not sure about that.


View attachment 876360
Another thing I was having problems with is the DVD player, it seems you have to hook up a wire for the Parking Brake switch in order to have it work. I just grounded it to the chassis of the stereo seems to work fine.



View attachment 876356
Metra 70-8112 harness used to connect the factory (white connector) to the new stereo utilizing the factory amp.




View attachment 876358
Schosche TA02B harness used to connect the 2 gray connectors to the new stereo in order to bypass or remove the factory amp.




View attachment 876362
Completed harness




View attachment 876363
2 connectors at the factory amp location




View attachment 876366
Connectors behind stereo. The 2 on the right are gray in color and the ones that I connected to. The white one is unused.




View attachment 876364
Stereo




View attachment 876372
Factory Amp removed

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Did you ever

My factory stereo was seriously lacking in performance in my 1995 Land Cruiser so I decided to upgrade to a Kenwood DDX371 Touch screen unit. I purchased the Metra 70-8112 Harness to connect the new stereo harness to the factory harness (white connector) behind the stereo. I drove it for about a week in this configuration but the new sound wasn't what I was expecting, so off to Mud to find a solution! I read through many different threads saying to bypass or remove the factory amp in order to let the new stereo power the speakers. I decided that this was the solution to getting it to sound better. The threads stated that I needed to get a different harness other than the Metra 70-8112. This new harness was the Scosche TA02B. In most of the threads it stated that I needed to add 20" of wire to extend it from the back of the new stereo to the amp location near the passenger right knee. I can follow instruction good enough so that's exactly what I did, however once I routed this harness and tried to plug into the male connectors that came off the amp, it was a no go, they didn't fit! Off to Mud again to figure out where I went wrong. I noticed in a lot of the pics that some rigs have 3 connections at the amp where I only had 2. Could this be the difference between the Land Cruiser and the LX? I don't know but it didn't work. I stumbled upon a thread that said to connect this harness to the 2 gray (previously unused) connectors behind the stereo. It worked and sounded much better too! Problem solved! Hope this helps someone else.

I wanted to post this because I found some of the threads very confusing and in my case not accurate for my application. Over all I'm happy with the set up, however the screen does have a glare issue. Another odd thing, my front door speakers do not work in any of the configurations but the little dash ones do...not sure about that.


View attachment 876360
Another thing I was having problems with is the DVD player, it seems you have to hook up a wire for the Parking Brake switch in order to have it work. I just grounded it to the chassis of the stereo seems to work fine.



View attachment 876356
Metra 70-8112 harness used to connect the factory (white connector) to the new stereo utilizing the factory amp.




View attachment 876358
Schosche TA02B harness used to connect the 2 gray connectors to the new stereo in order to bypass or remove the factory amp.




View attachment 876362
Completed harness




View attachment 876363
2 connectors at the factory amp location




View attachment 876366
Connectors behind stereo. The 2 on the right are gray in color and the ones that I connected to. The white one is unused.




View attachment 876364
Stereo




View attachment 876372
Factory Amp removed

View attachment 876356

View attachment 876358

View attachment 876360

View attachment 876362

View attachment 876363

View attachment 876364

View attachment 876366

View attachment 876372

Did you ever find out how to fix the 'no sound from front door speakers' issue? I just soldered up a harness from my new stereo to a Metra amp bypass harness, and plugged it into the two gray connections at the truck and I'm getting sound from the front knee speakers and the rear roof speakers, but nothing from the door speakers. Not sure how to deal with this, given that the harness only has 4 speaker connections and I'm weak at electrical.

 

[HankMoody]

Been having issues with my speakers not working or popping. Replaced a speaker and that’s not an issue. Went to look for the stock amp and it appears it’s missing possibly? See picture below. Did some years not come with an amp or is it likely it was removed? Stereo head unit it stock, doesn’t look like original owner did any upgrades or mods. Thanks

 

[Malleus]

What year? US spec? How many speakers do you have?

The 9 speaker stereo was standard for all US spec 80 series models, but maybe not non-US (IDK). If you have more than four speakers, there should be an amplifier.

Why does no one think to use the EWD? The stereo doesn't run on gas.

 

[HankMoody]

What year? US spec? How many speakers do you have?

The 9 speaker stereo was standard for all US spec 80 series models, but maybe not non-US (IDK). If you have more than four speakers, there should be an amplifier.

Why does no one think to use the EWD? The stereo doesn't run on gas.

Have this on two threads now, believe you responded to the other. I have 6 speakers, two dash, two second row, and two third row. Believe thats why I dont have a factory amp. US spec. What is EWD?

 

[revelario]

Have this on two threads now, believe you responded to the other. I have 6 speakers, two dash, two second row, and two third row. Believe thats why I dont have a factory amp. US spec. What is EWD?

Electrical Wiring Diagram.

It took me a while to find a copy but it’s been really helpful.

FWIW, I had no idea I had rear speakers until I bothered to look back there and at the diagram. Was so busy tackling other squawks on the truck that it wasn’t even in my list of priorities till I started with the stereo project.

 

[HankMoody]

Electrical Wiring Diagram.

It took me a while to find a copy but it’s been really helpful.

FWIW, I had no idea I had rear speakers until I bothered to look back there and at the diagram. Was so busy tackling other squawks on the truck that it wasn’t even in my list of priorities till I started with the stereo project.

Can you share the EWD? Know where I can find it?

 

[revelario]

Can you share the EWD? Know where I can find it?

It took me 3 seconds of Google:

1994 Toyota Land Cruiser Wiring Diagram Manual - NEED

Does anyone know where I can get the 94 wiring diagram manual? I searched everywhere and that seems to be the only year no one has. Digital file preferred. I attached a picture as a reference. Thanks again

forum.ih8mud.com

 

[Malleus]

Can you share the EWD? Know where I can find it?

That's the 1994 edition. The 1995 edition is in the Resources Section. Along with the FSM.

 

[Malleus]

Have this on two threads now, believe you responded to the other. I have 6 speakers, two dash, two second row, and two third row. Believe thats why I dont have a factory amp. US spec. What is EWD?

Do you have a model without a sunroof and rook rack too?

 

[avdeveloper]

question: I have the 1997 lexus lx 450 and looking at the diagram in the resources EWD attached to this post, I only see two connectors. one gray and the other white (amp). On the videos I checked, there are a total of 3: 2 gray connectors (bypasses amp) and one white if u want to use factory amp. I see on my car that there is just one gray and one white.

 

[avdeveloper]

welp I found this thread Thread '1997 LX450 Stereo /Power antenna /Amp bypass' 1997 LX450 Stereo /Power antenna /Amp bypass - https://forum.ih8mud.com/threads/1997-lx450-stereo-power-antenna-amp-bypass.838474/