Input Signal
Indicator Light
Blinking Pattern
Stop Light
switch ON
Light
ON
OFF
SW OFF
SW ON
DI
−
314
−
DIAGNOSTICS
CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch sends a signal to the ECU. When the ECU receives
this signal, it cancels the cruise control.
A fail
−
safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
The cancel conditions are: Battery positive voltage at terminal STP
−
When the brake is on, battery positive voltage normally applies through the STOP fuse and stop light switch
to terminal STP
−
of the ECU, and the ECU turns the cruise control off.
If the harness connected to terminal STP
−
has an open circuit, terminal STP
−
will have battery positive volt-
age and the cruise control will be turned off.
Also, when the brake is on, the magnetic clutch circuit is cut mechanically by the stop light switch, turning
the cruise control off (See page
DI
−
298
for operation of the magnetic clutch).
WIRING DIAGRAM
See page
DI
−
298
.
INSPECTION PROCEDURE
1
Check operation of stop light.
CHECK:
Check that stop light comes on when brake pedal is depressed, and turns off when brake pedal is released.
NG
Check stop light system (See page
BE
−
24
).
OK
2
Input signal check.
CHECK:
(a)
See input signal check on
DI
−
286
.
(b)
Check the indicator light when the brake pedal is de-
pressed.
OK:
The indicator light goes off when the brake pedal is
depressed.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI
−
295
).
NG
DI5OI
−
02
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