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1 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
da 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.
da 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.
da jayeff
Thanks.... Using 20x jeweler's glasses and don't see any markings on the smaller components.
da uhf mhz