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Do not mess around with this as it is a complete computer unit behind the facia and expensive and the official wiring diagram just shows a block with connections and no colours or numbers but then it is a haynes book so say no more ,it just says typical wiring diagram .Now what you can do is find a three or four click switch from a lod 60s model car then wire it directly into the motor under the passenger side dash where their is the resistor pack.Or pay the money for a new unit ,i also do this for the AC on and off as well ,YES I AM cowboy i admit i can and do bodge these things but wait till you find out the price ,the blower motor is 198+tax alone
2007 Toyota Sienna Car Audio Wiring Color Codes Car Radio Battery Constant 12v+ Wire: Blue/Yellow Car Radio Accessory Switched 12v+ Wire: Gray Car Radio Ground Wire: Brown Car Radio Illumination Wire: Green Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: Black/Red Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Pink Left Front Speaker Negative Wire (-): Violet Right Front Speaker Positive Wire (+): Green Right Front Speaker Negative Wire (-): Blue Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Black Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Red Right Rear Speaker Negative Wire (-): White
Radio Constant 12V+ Wire: Blue/Yellow Radio Switched 12V+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Green Left Front Speaker Wire (+): Pink Left Front Speaker Wire (-): Purple Right Front Speaker Wire (+): Purple Right Front Speaker Wire (-): Light Green Left Rear Speaker Wire (+): Black Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Red Right Rear Speaker Wire (-): White
No idea to be honest but you must be able to find the colour of the wires at the ends and then re-connect them i would have thought unless its all the same colour wires ,or look at the council scrap yards and see if you see a similar machine and take the wireing out of it but take plenty of pics on the phone so you know where they all go ?.
Personally owning this car and installing several Hyundai stereo's, I would purchase a wiring harness kit from car audio shop or electronics retailer. The wire harness has a plug that connects to the cars wiring harness. This wiring harness kit will also list the wires to connect your new aftermarket radio to the harness. I would also recommend using crimped **** connectors to attach the two harnesses together.
If the rear speakers worked before your new head unit was installed, then the first question is does your new head unit have the facility to feed four speakers. Some systems will only power two speakers. The Audio Shop should have rectified the fault - you paid for the installation and as the customer you have a reasonable expectation that they would do it properly and ensure that all of the existing speakers were functioning properly. It would be worth challenging them again - if they refuse you could go to Citizen's Advice Bureaux or the nearest Trading Standards Office. Alternatively, try tracing the wires back from the rear speakers to the head unit - are the wires connected up properly... at both ends (i.e., the speaker end and the head unit).
The audio shop has probably hard wired the head unit because the sockets in the back of the head unit were not compatible with the plugs that came as standard with the car. A Haynes Manual or equivalent will give the colour codes for the various wires for the audio system.