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Discussion Starter #1
I received an aftermarket stereo harness for my RAV4 that's missing pin2 on the 28 pin harness, which is needed to connect to the reverse wire on the stereo. The harness includes everything else I need.

What kind of pin or pin/wire do I need to add the extra pin to this connector? Is there anywhere in the US I can order one from?

And I'm not looking for the female pin connector, I'm looking to add a pin to the connector that attaches to my car's 28-pin female socket.
 

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Can't you contact the vendor of the aftermarket stereo harness and tell 'em that the harness is defective, it is missing contacts?
 

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Discussion Starter #3
It's not defective. It just wasn't designed to support the OEM rear camera on my RAV. Other than that, it's a more efficient harness for this head unit than others I have found and supports better SWC functionality (doesn't require an SWC controller, and picks up all controls).

I ordered this harness from the Android head unit's manufacturer (Pumpkin) in China. I'd prefer not to wait another 10 days to receive a single pin connection for it. Surely, these are available? Just need a part number.

I think something like this (though not positive if this is the right one):
Long needle + short needle Volkswagen ECU connector pin terminal meter cruise terminal-in Connectors from Electrical Equipment & Supplies on Aliexpress.com | Alibaba Group

Also hoping to find a vendor where I can just order a few - preferably within the US.

I've already built a harness out of several other connectors that does everything needed (power, speakers, SWC, audio in, OEM rear camera), though it's gotten pretty big and messy. By adding one pin to the 28 pin adapter, I can have a nice clean harness that supports all functionality.
 

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Rad3d,

What did you do to tap into the backup camera connector? I'm also installing a new head unit and do not want to cut or tap the wires.
 

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Discussion Starter #6
I've gone 2 different directions with my harnesses - but the main backup cam connection was done using one of these:

Axxess AX-TOYCAM-3 - Add-On Harness for retaining OEM Backup Camera (includes 12-6v stepdown?)
Metra Online

I found for $9.49 on Ebay, though I only see this one from BestBuy now for $20
Metra Harness for Most 2011 2014 Toyota Vehicles Multi | eBay

It's a 24 pin harness that connects to the one in your RAV. It has both male and female 24 pin connectors (female doesn't connect to anything), and has male and female RCA jacks that support either the OEM camera or allow you to add a 3rd party one. The only thing it's missing is Reverse wire that comes off of pin2 on your 28-pin connector.

My first harness - which was pieced together from a few different ones - included an ASWC1 controller (~$47), and an Axxess AX-TOY28SWC add-On Harness with RCA Audio In - $6.99
Amazon.com: Axxess AX-TOY28SWC Steering Wheel Controller Add-On Harness with RCA and 28-Pin Connector for Toyota Vehicles: Car Electronics

The TOY28SWC had a free Reverse wire coming from Pin2 on it's 28pin connector - so I just connected to the Head Unit's reverse pin, and connected Yellow and Black wires from the AX-TOYCAM-3 to the Yellow and Black wires in my main harness.

Everything worked - including the backup cam, though I wasn't getting all of my SWC keys.

I spoke to Pumpkin support, who said I actually didn't need the ASWC1, and said they had a Toyota-specific harness for $18. I bought it (10 days to ship), and it was a nice, simple harness that connected SWC directly (no controller), but it didn't have a pin in the 28 pin connector for the reverse wire (they told me this before I purchased). See first image attachment.

The pins mentioned in the previous comment 'do' fit this 28 pin connector, so I soldered a wire to one and carefully added it at the pin 2 position. You want to be careful if you do this, as once you get it in place, you need some special tools to even attempt to remove the pin. But it worked as expected (see second attachment)

With the pin added, everything works with the Pumpkin harness - including the OEM camera - though I'm still using the AX-TOYCAM-3 24 pin cable with this setup.

In this configuration, you 'only' need the Pumpkin harness and the AX-TOYCAM-3, but I had to add the extra reverse wire, and I also had to cut the yellow and black wires on the Pumpkin harness, so I could splice in the yellow and black wires from the AX-TOYCAM-3.

But - I'm still not done yet...

One issue I still have is that the Pumpkin harness is only allowing the head unit to see 4 of my SWC keys (Pumpkin support tells me that I should see ALL of them, so we're still working through). With the ASWC1 setup, I was able to see 8 (out of 12) keys.
 

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Rav4 Pioneer Nex4100 install

Thanks for the excellent information! I have ordered much of the same except for the AX-TOYCAM-3, which I just ordered and should have it here for the weekend to install. I had also decided to use the iDatalink Maestro ADS-MSW Steering wheel control interface. I'm installing a Pioneer Nex4100 BTW. Here's what I've ordered for the install:

Scosche Radio Wiring Harness for 1987-Up Toyota Power/4 Speaker Connector
https://www.amazon.com/gp/product/B00009UHKW/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1

iDatalink Maestro ADS-MSW Steering wheel control interface - connects your car's steering wheel audio controls to an aftermarket stereo
https://www.amazon.com/gp/product/B00J4W10XG/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

Axxess AX-TOY28SWC Steering Wheel Controller Add-On Harness with RCA and 28-Pin Connector for Toyota Vehicles
https://www.amazon.com/gp/product/B00BXF5A74/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

MicroBypass Parking Brake Switch Fully Automatic Video in Motion Interface for Pioneer Model AVH-4100NEX
https://www.amazon.com/gp/product/B00VKQ6ECQ/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

** Although I've read I may be able to do this without the bypass now and disable through a hidden option**

Metra 40-LX11 Antenna Adaptor Cable - Select 2009-Up Lexus/Toyota
https://www.amazon.com/gp/product/B003VYWSES/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

Kenwood KAC-M1804 Compact 4-channel Amplifier
https://www.amazon.com/gp/product/B00JEC0YFQ/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

2 of JBL GT7-6C 6.5" 2-Way GT7-Series Component Speaker System-Set of 2
https://www.amazon.com/gp/product/B00OYGV6IQ/ref=oh_aui_detailpage_o03_s01?ie=UTF8&psc=1

PAC USB-TY1 toyota/Lexus OEM USB Port Retention CablePAC USB-TY1 toyota/Lexus OEM USB Port Retention Cable
https://www.amazon.com/gp/product/B00F0YJ49O/ref=oh_aui_detailpage_o03_s01?ie=UTF8&psc=1

DROK® Waterproof DC Buck Converter Voltage Regulator 8-22V to 1-15V 5V 12V 3A Adjustable Output Power Supply Transformer Step-down Volt Module Boa
https://www.amazon.com/gp/product/B00C0KL1OM/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
 

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Discussion Starter #8
Looks like a nice configuration.

I bought the DROK Converter originally, but never used it. The information I first got on the AX-TOYCAM-3 states that it does the conversion, but I'm not sure I see a transformer anywhere. I've also talked to a few people who've said they've done the installation without the transformer and the OEM camera worked just fine.

All I know is that my OEM backup camera works with the AX-TOYCAM-3 alone.
 
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