Tacoma PreRunner Dbl Cab 2WD V6-3.4L (5VZ-FE) (2001)
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Key Reminder Switch: Description and Operation
KEY REMINDER AND SEAT BELT WARNING
SYSTEM OUTLINE
Current always flows to TERMINAL 4 of the body ECU through the DOME fuse.
1. SEAT BELT WARNING SYSTEM
When the ignition SW is turned on, current flows from the ECU-IG fuse to TERMINAL 10 of the body ECU. At the same time, current flows to
the ECU from the GAUGE fuse through the seat belt warning light. This current activates the body ECU and, for approx. 4 - 8 seconds, the
current flowing through the warning light flows from ECU to TERMINAL 8 to GROUND, causing the warning light to light up. At the same time
as the warning light lights up, a buckle SW LH on signal is input to the body ECU, the current flowing from TERMINAL 4 of the body ECU flows
to TERMINAL 8 to GROUND and the seat belt warning buzzer sounds for approx. 4 - 8 seconds. However, if the seat belt is put on (Buckle SW
LH off) during this period (While the buzzer is sounding), a signal input to the body ECU stops and the current flowing from TERMINAL 4 of the
body ECU to TERMINAL 8 to GROUND is cut, causing the buzzer to stop.
2. KEY REMINDER SYSTEM
With the ignition key inserted in the key cylinder (Unlock warning SW on), the ignition SW still off and front LH door open (Door courtesy SW
on), a signal is input to the body ECU, the body ECU operates and current flows from TERMINAL 10 of the ECU to TERMINAL 8 to GROUND
and the key reminder buzzer sounds.
