Yamaha TMAX 2020 Service Manual page 429

5. The smart key system indicator
light " " flashes.
(The indicator light repeatedly
flashes 3 times, and then goes off
after approximately 20 seconds.)
Refer to "SMART KEY SYSTEM
SELF-DIAGNOSIS" on page 8-78.
NO
• The smart key system indicator light
" " does not flash.
• There are sources of strong electro-
magnetic waves in the vicinity 
Move the vehicle.
• Smart key malfunction  Register
and use a different smart key.
• Remote control unit malfunction 
Replace the remote control unit.
Engine does not start even though vehicle power is turned on.
1. When the vehicle power is turned
on, the smart key system indicator
light " " flashes.
Refer to "SMART KEY SYSTEM
SELF-DIAGNOSIS" on page 8-78.
YES
2. Check for continuity in the commu-
nication line between the ECU and
the remote control unit
(Yellow/Blue).
OK
• Check the engine.
Refer to "FUEL INJECTION SYS-
TEM".
• Replace the ECU.
• Replace the remote control unit.
Seat/fuel lid does not open. (Vehicle power is turned on.)
TIP
If the smart key system indicator light " " comes on for 0.3 second, goes off for 1.0 second, and this
pattern continues for 20 seconds (error) when the seat/fuel lid is opened, the seat/fuel lid cannot be
opened unless the vehicle power is turned off and then on.
1. Check the vehicle power.
Refer to "Checking the vehicle
power".
OK
Steering lock unit data error or malfunction
YES
 Replace the steering lock unit.
Check and repair the electric starting sys-
tem.
NO
Refer to "ELECTRIC STARTING SYS-
TEM" on page 8-7.
NG Replace the wire harness.
NG Repair or replace any defective parts.
8-74
SMART KEY SYSTEM