My suzuki grand vitara v6 CHECK ENGINE light Blinks continuosly when the switch turned to on position

Correct. When you turn off the engine you lose the engine vacuum to the brake boost assist. No brakes. Can't accelerate with engine off.

see if you can pull the timing belt cover over enough to see timing belt. then have someone crank engine and see if it is turning.

Take it to autozone they will check your engine light for free and tell you the problem.

you must test this procedure. God bless you
When you turn the ignition ON before starting the car, the "Check engine" light is supposed to come on indicating that the engine computer (also could be called ECM, PCM, or ECU) is powered on. If the "Check engine" light does not come with the ignition ON, it's possible that there is no power coming to the engine computer (e.g., due to a broken wire, faulty main relay, burnt fuse, etc.) or that there is a problem with the engine computer itself.

The check engine light is because all check engine light codes are caused by components that affect emissions. It's not actually an engine problem, it's a problem with either your O2 sensor, MAF sensor, fuel/air ratio, pyrometer, or exhaust.

obd2 scanner

Disconnect the postive battery connection again and leave it disconnected for at least one minute.
Reconnect the battery connection and start it up.

Make sure your gas cap is tight. also go to a Auto Zone they will clear the code for free.

Take your rig.. drive it to a gas station.. fill the tank up with gas.. also fill 2 jugs of gasoline at the same time... put the jugs in the back of it.. now drive as far as you can until the rig runs out of gas.. then, take the two jugs of gas.. pour it all over the rig, inside and out.. now light it a-blaze, then walk to your nearest car dealer and buy a new car..

turn the power switch off for the transmission. It is not a warning light. It just indicates the power switch for the trans is on which lets the trans delay shifting in each gear so it allows the engine to get more RPM'S so it produces more HP and Torque.

Most likely your timing chain.
This is a major problem 99 -05 V6 GV.
The Timing chain tensioner failed.
When the chain breaks it destroys the engine.
Unfortunately is an "Interference" engine.
This and the rear main seal are the big problems with these cars.