How do I change frequencies so both cars are not controlled by same controller

The frequency cannot be changed in the cars. The frequency is set, you have to buy two different frequency cars. There are stickers on the cars, and there is also a label on the outside of the box. The frequencies are 27 and 49, we got two 49s, so we ll have to exchange one.

How to change frequency on RC toy car? - Instructables

www.instructables.com/.../How-to-change-frequency-on-RC...

InstructablesAug 4, 2009 - My friend and I bought 2 rc toys (1:18 scaled Ferrari F1) just for fun, but they work on same frequency (40.685 MHz) so we can't drive at same time. So i need some suggestions on how to change the frequency on one of them. The transmitter have quartz crystal, but receiver have only ...

Modding Fisher-Price 72825 Formel Junior Fernlenkflitzer

www.instructables.com/.../Modding-Fisher-Price-72825-For...

InstructablesI'll show you how to modify a rc toy car to work on a different frequency. ... the method I describe here should work with nearly every rc car. ... if you mean to change thefrequency from lets say 27.005Mhz to 27.415Mhz, it's basically the same.

How to change frequency on RC toys - Instructables

Hi Janet, unfortunately this I'd due to the transmitter frequency being the same! This should have been pointed out to you when purchasing both items together! The packaging should indicate this too! I race remote control cars and on the higher end transmitters the frequency can be changed so all racers are on different frequencies but this would not be the case for you!

None that I have ever heard of---usually those are burned in the microprocessor circuit the unit uses with the remote.

Only chance would be to contact the maker of each to see if alternate code can be set but I doubt it.

IM NOT FAMILIAR THE THESE BRANDS BUT THERE SHOULD BE A CHIP IN THE CONTROLER THAT POPS OUT THAT YOU CAN CHANGE AS WELL AS THE CAR ITSELF. FIRST LOOK AT THE CONTROLLER WHERE IT HAS THE FREQUENCY AND YOU SHOULD BE ABLE TO PULL IT OUT. IF SO THERE IS ONE IN THE CAR TOO, JUST MAKE SURE YOU BUY A DIFFERENT FREQUENCY AND REINSTALL.

Here's the relevant instructions out of the manual.
Storing and recalling broadcast frequencies You can easily store up to six broadcast frequencies for later recall. ! Six stations for each band can be stored in memory. 1 Press LIST. Preset screen is displayed. 2 Use MULTI-CONTROL to store the selected frequency in memory. Turn to change the preset number. Press and hold to store. # You can also store the frequency in memory by pushing and holding MULTI-CONTROL right. 3 Use MULTI-CONTROL to select the desired station. Turn to change the station. Press to select. # You can also change the station by pushing MULTI-CONTROL up or down. # To return to the ordinary display, press BAND/ESC or LIST. # If you do not operate the list within about 30 seconds, the display automatically returns to the ordinary display.
You can find the full manual here: http://www.pioneerelectronics.com/StaticFiles/PUSA/Files/DEHP4000UBOperationManual1019.pdf

It changes the frequency (because it's a dual frequency remote). I don't know which setting is which frequency though.

Because of regulations set by the authority in your (any) country which controls the radio spectrum usage, toys in particular are only allowed to operate on certain frequency bands and the transmitter must be controlled by signal sources (oscillators) that are 'crystal' controlled (quartz). These maintain a very stable signal at a specific frequency just like a 'quartz watch.' The receivers need not be that stable so the controlled toy has a simpler circuit that can be tuned but this isn't useful in your case since that would only result in reducing the sensitivity (range) unless the transmitter crystal was changed.
I'm sure the manufacturer has anticipated the possibility that two or more of these toys might be operated in close proximity and probably has multiple models with different crystals available but unless you can contact them, this won't do you much good as you would likely have to return the toy to have it changed.

There should be dip switches in/on both the remote control and the ceiling fan that enable you to change the control frequency. The only thing that you have to ensure is that the two components are set to a matching frequency.

The switches in the remote are located in the battery compartment just above the batteries. Remove the dome on the ceiling fan and you should find the switches for that unit. Just compare the two and match whatever changes you make from one unit to the other.

This is copied from the manual, hope it helps:

You can easily store up to six broadcast frequencies
for later recall.
! Six stations for each band can be stored in
memory.
1 Press LIST.
Preset screen is displayed.
2 Use MULTI-CONTROL to store the selected
frequency in memory.
Turn to change the preset number. Press and
hold to store.
# You can also store the frequency in memory
by pushing and holding MULTI-CONTROL right.
3 Use MULTI-CONTROL to select the desired
station.
Turn to change the station. Press to select.
# You can also change the station by pushing
MULTI-CONTROL up or down.
# To return to the ordinary display, press
BAND/ESC or LIST.
# If you do not operate the list within about 30
seconds, the display automatically returns to the
ordinary display.