Toyota ZZT230 series, Repair Manual

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Dl-515
DIAGNDSnCS
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CRUISE CONTROL SYSTEM
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 is applied through the STOP fuse and stop tight
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 01-498 for operation of the magnetic clutch)