OEM Connectors and Harness for the 2017 Toyota Aqua

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OEM Connectors and Harness for the 2017 Toyota Aqua

I recently purchased a 2017 Toyota Aqua, which was manufactured in 2018. The car came without a factory stereo, so I’m planning to install an aftermarket stereo.

However, I’m having difficulty identifying the connectors in the vehicle. I’ve managed to identify 4 out of the 7 cables, but I’m unsure about the remaining 3. If anyone could assist me with this, I would greatly appreciate it. I’m also open to any corrections if I’ve misidentified the connectors. Thank you!

Sirat Ul Jinan asked on 23 Jan 2025 17:19:59 pm

1 Answer

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Car Mechanic Expert - on 23 Jan 2025 17:22:59 pm

Several connectors are also present on Prius c models designed for the U.S. and European markets, and you may have already recognized them:

Larger Connectors: The two larger connectors, featuring 10 and 6 positions arranged in a “U” shape, are used for the +B and ACC power supply, ground, speakers, and illumination. Their pin configurations are consistent across many Toyota vehicles.

28-Pin Connector: The connector with 28 positions in two rows serves multiple functions. However, on models sold in Japan, it appears that only the steering wheel switch connections—terminals 21 and 22—are utilized. If your connector has just two wires, those are likely the ones.

Coaxial Terminal Connector: The connector with a coaxial terminal is designated for the radio antenna and its power supply.

Japan-Specific Connectors: The remaining connectors are specific to vehicles sold in Japan. While I don’t have complete documentation, I can offer some educated guesses:
The five-position are shown in connector , if it has two wires attached, is likely intended for a CAN bus connection, with the following pinout:
Terminal 4: CANH
Terminal 5: CANL

If you have any further questions o r need additional clarification, feel free to ask!