What does the integration relay do on a Toyota Rav4?

Horn circuits are typically operated through a relay. Locate your owners manual and find the relay in your power control panel (probably under the hood). Remove the relay and change it with another in the control panel (that is, if there's another one like it) and see if the problem moves with the relay. If so, replace the relay. There should also be a separate fused circuit that controls the relay. If its not the relay there might be a loose connection or another faulty switch, etc. in that circuit. In that case you'll need a wiring diagram to find out what else is on the horn relay control circuit. Try one device and connector at a time until you've check the integrity of the circuit. Last thing to check would be the power control panel itself. There might be a loose connection from another powered circuit making contact with the horn circuit.
Good luck.

TAIL LIGHT NOT WORKING

It can be faulty tail light bulb or its issue with tail light control switch or its wiring's are short.

Check the voltage at fuse slot of tail light.Do you receive 12 volt there.If not,then it says tail light switch is not receiving power supply.

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There are few help links related to your problem.I suggest you refer the list and check the help links.Click the link below:-----

Turn Signal Not working

http://technoanswers.blogspot.com/2012/11/turn-signal-not-working.html

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Right turn signal not working on Pontiac Car?

http://schematicsdiagram.blogspot.com/2011/12/right-turn-signal-not-working-on.html

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Only one side indicator light working on car?

http://schematicsdiagram.blogspot.com/2011/12/only-one-side-indicator-light-working.html

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Turn signals not working on 1987 Jeep Wagoneer?

http://schematicsdiagram.blogspot.com/2011/12/turn-signals-not-working-on-1987-jeep.html

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SOLVE YOUR 4 WAY FLASHER RELATED PROBLEMS HERE

http://repairhelpcenter.blogspot.com/2012/11/4-way-flasherturn-signal-flashersignal.html

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1994 Toyota Camry: Bypass Tail light Relay Circuit?

http://whatisbyme.blogspot.in/2012/04/1994-toyota-camry-bypass-tail-light.html

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2008 Toyota RAV4: Replace Tail light Lens Cover?

http://technoanswers.blogspot.in/2012/04/2008-toyota-rav4-replace-tail-light.html

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2003 Chevrolet S10 Tail light Fuse

http://schematicsdiagram.blogspot.com/2012/11/2003-chevrolet-s10-tail-light-fuse.html

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Chevrolet Parking light and Tail lamp light Wiring diagram

http://schematicsdiagram.blogspot.com/2012/11/chevrolet-parking-light-and-tail-lamp.html

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Car Tail Lights Not Working?

http://schematicsdiagram.blogspot.com/2011/12/car-tail-lights-not-working.html

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These details will help.

Thanks.

Then you need someone who can,like a repair shop

need more ifo

It can be faulty tail light bulb or its issue with tail light control switch or its wiring's are short.

Check the voltage at fuse slot of tail light.Do you receive 12 volt there.If not,then it says tail light switch is not receiving power supply.


---------
There are few help links related to your problem.I suggest you refer the list and check the help links.Click the link below:-----
1994 Toyota Camry: Bypass Tail light Relay Circuit? http://whatisbyme.blogspot.in/2012/04/1994-toyota-camry-bypass-tail-light.html

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2008 Toyota RAV4: Replace Tail light Lens Cover?

http://technoanswers.blogspot.in/2012/04/2008-toyota-rav4-replace-tail-light.html
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2003 Chevrolet S10 Tail light Fuse http://schematicsdiagram.blogspot.com/2012/11/2003-chevrolet-s10-tail-light-fuse.html
--------- Chevrolet Parking light and Tail lamp light Wiring diagram http://schematicsdiagram.blogspot.com/2012/11/chevrolet-parking-light-and-tail-lamp.html
---------- Car Tail Lights Not Working?

http://schematicsdiagram.blogspot.com/2011/12/car-tail-lights-not-working.html

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Turn Signal Not working http://technoanswers.blogspot.com/2012/11/turn-signal-not-working.html
---------- Right turn signal not working on Pontiac Car?

http://schematicsdiagram.blogspot.com/2011/12/right-turn-signal-not-working-on.html

--------
Only one side indicator light working on car?

http://schematicsdiagram.blogspot.com/2011/12/only-one-side-indicator-light-working.html

-----------
Turn signals not working on 1987 Jeep Wagoneer? http://schematicsdiagram.blogspot.com/2011/12/turn-signals-not-working-on-1987-jeep.html

-----------

SOLVE YOUR 4 WAY FLASHER RELATED PROBLEMS HERE
http://repairhelpcenter.blogspot.com/2012/11/4-way-flasherturn-signal-flashersignal.html

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Thesedetails will help.
Thanks.

Do the flashers still work? This sounds like a bad flasher relay problem.Locate the flasher for the turn signals and hazard lights. The flasher relay is under the dash near the steering column. It will be the larger of the square relays.Try wiggling it to see if turn siganls will work or emergency flashers will work. The relay should look like this

the module can be replaced by a chime or a truck blinker switch from a diesel truck shop and you may here it, however the other guy is right and has a couple good ideals. JC whitnet has one
here is the web page. and this is for the
RAV 4 http://www.jcwhitney.com/autoparts/Search?catalogId=10101&storeId=10101&sku=loud+turn+signal+flasher
CEC INDUSTRIES MUSICAL AND VERY LOUD TURN SIGNAL FLASHERS
Hear your turn signal over road noise and music! Select "Love Me Tender" which plays at standard volume, or our signal flasher louder than a standard flasher.
Review this product

You can find the fuse box either under the Driver's side of the dashboard or in the Engine compartment.

Try this solution, hope you can find the right one.

there is a seprat fuse and flasher for the turn signals on the rav4 so check the fuse panle

The integration relay is a large white box, and it is attached to the fusebox, under the dashboard, driver side. It is a very expensive part.