Toyota Camry Manual page 525

BE–206
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
CIRCUIT DESCRIPTION
When the brake is on, battery voltage normally applies through the stop fuse and stop switch to
terminal STP– of the ECU, and the ECU turns the cruise control off.
A fail–safe function is provided so that the cancel functions normally, even if there is a malfunction in
the stop light signal circuit.
1 If the harness connected to terminal STP– has an open, terminal STP– will have battery positive
voltage and the cruise control will be turned off, also SET not occurring.
2 If the stop fuse is open, terminal STP+ becomes approx. 0 V when the brake is turned on, so the
ECU performs cancel function normally.
Also, shown the brake is on, the magnet clutch circuit is cut mechanically by the stop light switch, turn–
ing the cruise control off. (See page
DIAGNOSTIC CHART
Check operation of stop light.
Input signal check.
Check voltage between terminal
STP+ STP– of cruise control ECU
connector and body ground.
Check for open in harness and
connectors between terminal STP+ of
cruise control ECU and stop light
switch, terminal STP– of cruise control
ECU and stop Iight switch.
Check and replace cruise control
ECU.
BODY ELECTRICAL SYSTEM
BE–190 for operation of the magnet clutch.)
– CRUISE CONTROL SYSTEM
Check stop light circuit
(See page BE–50).
Proceed to next circuit
inspection shown on matrix
chart (See page BE–178).
Proceed to next circuit
inspection shown on matrix
chart (See page BE–178).
Repair or replace harness or
connector.