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9. SAFETY INTERLOCK BOARD (SIB):
The ITrim is equipped with an integrated
circuit board designated as the Safety
Interlock Board (SIB). The SIB controls the
vehicle starter cranking, engine run and
deck run circuits and the indicator lights.
The starter motor won’t crank unless the
following conditions are met:
a. Operator must be sitting in the
seat.
b. Foot Pedal must be in neutral
position.
c. Deck Switch must be off.
If the operator gets up off the seat the
engine will continue to run if the following
conditions are met:
a. The foot pedal is in neutral
position.
The deck switch is off.
PROBLEM: STARTER WON’T CRANK - with
pedal in neutral position, operator in seat and
deck run switch in off position.
1. Using a test light, check for power to the start
relay, terminal 87 when the ignition switch is
turned to the start position.
If test light doesn’t come on at start relay, terminal
87:
1. With a test light, work back from the start
relay, checking for power at the ignition
switch, circuit breaker and positive battery
post on the starter solenoid.
2. Replace defective components or repair
wiring.
If test light comes on at start relay, terminal 87:
1. Remove contact terminals, terminals 87 and
30, from start relay.
2. Connect the contact terminals together with
a temporary jumper made with spade
terminals and 10 GA wire.
3. Turn the ignition switch to the start
position.
If engine doesn’t crank:
1. With a test light, check for power at plastic
connector on the starter solenoid while an
assistant turns the key.
If test light doesn’t come on:
The problem is in the wiring or
terminals between the start relay
and the starter solenoid.
If test light comes on:
The problem is in the starter
solenoid or starter.
If engine cranks:
1. Remove jumper and reinstall terminals on start
relay.
2. Turn the ignition switch to the on position.
3. Check the indicator lights on the SIB with an
assistant sitting on the seat of the vehicle.
a. All four indicator lights should be on.
If no lights come on:
1. Check for a blown fuse on the SIB and
replace if faulty.
2. Check for power to the SIB by checking
fuse receptacle with a test light. The left
slot of the fuse receptacle should have
power.
If there is no power to the left slot of the fuse
receptacle:
1. Check for power at terminal J2-2 on the SIB
with a test light. (Insert test light probe into
backside of connector.)
If there is power at terminal J2-2 on the SIB but
not at the left slot of the fuse receptacle, the
SIB is faulty and should be replaced.
If there isn’t power at terminal J2-2 on the SIB,
the problem is in the wiring or the terminals
between the ignition switch and the SIB.