Electronic Control Unit (Ecu); Seat Switch - Toro Reelmaster 6500–D Service Manual

Electronic Control Unit (ECU)

The Toro electronic control unit (ECU) senses the condi-
tion of various switches, such as the seat switch, cutting
unit down switches, traction neutral switch, etc., and di-
rects power output to allow certain machine functions,
such as engine run, cutting units engage, etc.
Because of the solid state circuitry built into the control-
ler, there is no method to test it directly. The controller
may be damaged if an attempt is made to test it with an
electrical test device, such as a volt–ohm meter.
IMPORTANT: Before welding on the machine, dis-
connect both battery cables from the battery, dis-
connect both wire harness connectors from the
electronic control unit and disconnect the terminal
connector from the alternator to prevent damage to
the electrical system.

Seat Switch

The seat switch is a proximity type, normally open (NO)
reed switch that closes when the operator is on the seat.
With the operator on the seat, the magnet on the bottom
of the seat activates the reed switch causing it to close
and complete the circuit.
1. Raise the seat to get access to the seat switch wiring
connector.
2. Disconnect the seat switch wiring connector and
install a continuity tester or ohm meter between the two
leads of the seat switch.
3. Lower the seat. The continuity tester should show no
continuity.
NOTE: Make sure the compression spring holds the
seat up off the seat switch when there is no operator on
the seat.
4. Have the operator sit on the seat, slowly depressing
the seat switch magnet. The continuity tester should
show continuity as the seat approaches the bottom of its
travel.
Electrical System
Page 5 – 36
1
Figure 17
1. Electronic Control Unit
(Located behind access
panel below seat)
1
Figure 18
1. Seat switch
Reelmaster 6500–D/6700–D