Keyfob Repair - Can't find schematic

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2013-2018 Toyota RAV4

The fourth-generation RAV4 was released in 2012 for the 2013 model year and was a complete redesign of the RAV4. It is known as the XA40 line.

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uhf mhz @uhfmhz

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发帖于: 2019年8月30日

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Keyfob Repair - Can't find schematic

2016 Toyota Rav4 keyfob failed. Can’t find a schematic. It does transmit, but very brief and weak signal. Capacitor? How do you determine values on micro capacitors on this board? https://fccid.io/GQ4-52T/Internal-Photos...

TRW Automotive, 314.4MHZ Transmitter

FCCID: GQ4-52T

Part Number: 226624-101 | 89071-0R040

Interchange Part Number: 1470A-33T

Battery Size: CR2016 (sold separately)

FCC ID: GQ4-52T

Board Marked: 226673-1 Rev C, Ref: Model: 226624-101, 226624-102

IC: 1470A33T, Canada IC: 1470A-33T

TRW Part No: 226624-101, 226624-102

Toyota Part No: 89071-ORO40, 89071-ORO20

Assembly Number 101 or 102

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Measurements can be done with multimeter, oscilloscope or something like the following tester:

BSIDE ESR02 PRO Transistor Tester SMD Components Checker Mega328 NPN/PNP Diode Resistor Inductor Capacitance ESR Meter

Check Amazon and other fine places for selection of different models, options etc

由 prop man 完成的 2019年8月30日

It's likely bad or weak component and so tester not really helpful unless I know specs. New OEM transmitter is $190 and so I ordered a used OEM for $22 from Ebay as replacement that I can program into the car myself. The new $20 China knockoffs aren't worth a flip (tried that too). Thanks for your input.

由 uhf mhz 完成的 2019年8月30日

Hi,

So there are no markings on the components then, even with a magnifying glass?

Here's a description of how it operates.

And here's info on the TDA chip

Not as good as a schematic but a start perhaps.

由 jayeff 完成的 2019年8月30日

Thanks.... Using 20x jeweler's glasses and don't see any markings on the smaller components.

由 uhf mhz 完成的 2019年8月31日

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uhf mhz @uhfmhz

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I ended up buying the same OEM Keyfob for $20 used on ebay. Will put it into a new case and then cut and program it into the car myself. Saves nearly $400 this way. Cheers…

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Measurements can be done with multimeter, oscilloscope or something like the following tester:

BSIDE ESR02 PRO Transistor Tester SMD Components Checker Mega328 NPN/PNP Diode Resistor Inductor Capacitance ESR Meter

Check Amazon and other fine places for selection of different models, options etc — prop man
It's likely bad or weak component and so tester not really helpful unless I know specs. New OEM transmitter is $190 and so I ordered a used OEM for $22 from Ebay as replacement that I can program into the car myself. The new $20 China knockoffs aren't worth a flip (tried that too). Thanks for your input. — uhf mhz
Hi,

So there are no markings on the components then, even with a magnifying glass?

Here's a description of how it operates.

And here's info on the TDA chip

Not as good as a schematic but a start perhaps. — jayeff
Thanks.... Using 20x jeweler's glasses and don't see any markings on the smaller components. — uhf mhz

iannai29 @supercell29 声誉积分: 35 3 · Answer 1 · 2019-11-02T09:35:43-07:00

iannai29 @supercell29

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发帖于: 2019年11月2日

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Hi there,

I purchased the following key for my 2015 RAV 4 XLE (http://tiny.cc/d7llfz) for $40, had it cut from my master key for $2 at our local locksmith and bought this OBD Remote Key Programmer (http://tiny.cc/x9llfz) for $36 to program both the transponder and the remote and it worked like a charm. It literally took me under five minutes to accomplish both. I also used the excellent instructions a successful customer provided within Amazon: http://tiny.cc/2nmlfz

I hope this helps!

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2013-2018 Toyota RAV4

Keyfob Repair - Can't find schematic

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