Thanks for the suggestions and your precious time to suggest courses on electronics.
( as answer to my question on why voltage divider is not a good idea in this context )
Paul__B:
How would I know what is in his mind?
Without the pictures we have requested (haven't we? Can't imagine why not!), we don't quite know
I have already posted a diagram which shows the IC control pin being grounded through a voltage divider.
Also mentioned about the feable current in the control lines.
@raschemmel
"one side motors working" does not a working RC car make.
Sir, Both sides of the car / both motors are working . They are controlled by 4 lines.
People here are really trying to help me getting the RC work, more than teaching the answer to the
question on the voltage divider. 
Thank you all.
I am attaching pictures of the control board. TAIYO 93-R in the IC used- sadly I was not able to find a data sheet online.
I have "arduinoed" a couple of RC cars already. But this new one is a bit of off-roading type, and may require more current than L293d, L298N . That is why I decided to take advantage of the inbuilt controller with good heat sinking.
One side of the board shows my poor soldering skills and hot glue work to attach and secure a connector to 5 "control - lines" ( @raschemmel Any better term for this?)