Page 793 of 2543
Park Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
When the shift position is put in EXCEPT D RANGE, a signal is sent from the park/neutral position switch to the
ECU. When this signal is input during cruise control driving, the ECU cancels the cruise control
WIRING DIAGRAM
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±191
Page 794 of 2543

INSPECTION PROCEDURE
Check that the starter operates normally and that the engine starts.
EG±381 or EG±487.)
(See page IN±30).
on page BE±169.
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
(1) See input signal check on page BE±169.
(2) Check the indicator light when shifting into ex±
cept D position.
Check operation of starter.
Check voltage between terminal D of ECU connector and body ground.
(1) Turn ignition switch ON.
(2) Measure voltage between terminal D of ECU
connector and body ground, when shifting into P,
N position and other positions.
Remove ECU with connectors still connected.
Input signal check.
The indicator light goes off when shifting into except D
range.
Proceed to engine troubleshooting (See page
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
VoltageShift Position
D range
Other ranges
Check for open in harness and connector between ECU and ST fuse
Repair or replace harness or connector.
Check and replace ECU. BE±192
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM
Page 795 of 2543
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc. Terminal GND and the cruise control
ECU case are grounded.
WIRING DIAGRAM
INSPECTION PROCEDURE
Check ECU±IG fuse.
Remove ECU±IG fuse from J/B No.1.
Check continuity of ECU±IG fuse.
Continuity
Check for short in all the harness and components
connected to the ECU±IG fuse (See attached wiring
diagram).
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±193
Page 796 of 2543
Check voltage between terminals +B and GND of ECU connector.
(1) Turn ignition switch ON.
(2) Measure voltage between terminals +B and
GND of ECU connector.
Remove ECU with connectors still connected.
Voltage: 10 ± 14 V
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
Check continuity between terminal GND of ECU connector and body
ground.
Measure resistance between terminal GND of cruise
control ECU connector and body ground.
Resistance: 1 or loss
Repair or replace harness or connector.
Check and repair harness and connector
between battery and ECU. BE±194
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM
Page 797 of 2543
Back up Power Source Circuit
CIRCUIT DESCRIPTION
The ECU back±up power source provides power even when the ignition switch is off and is used for diagnostic
code memory, etc.
WIRING DIAGRAM
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±195
Page 798 of 2543
INSPECTION PROCEDURE
Check ECU±B fuse.
Remove ECU±B fuse from R/B No.2.
Check continuity of ECU±B fuse.
Continuity
Check for short in all the harness and components
connected to the ECU±B fuse (See attached wiring
diagram).
Remove ECU with connectors still connected.
Voltage: 10 ± 14 V
Check continuity between terminal BATT of ECU connector and body
ground.
Measure voltage between terminal BATT of ECU con-
nector and body ground.
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
Check and repair harness and connector
between battery and ECU. BE±196
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM
Page 799 of 2543
Main Switch Circuit (Cruise Control Switch)
CIRCUIT DESCRIPTION
When the cruise control main switch is turned off, the cruise control does not operate.
WIRING DIAGRAM
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±197
Page 800 of 2543

Check harness and connector between cruise control ECU and main
switch, main switch and body ground. (See page IN±30).
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
(1) Turn ignition switch ON.
(2) Measure voltage between terminal CMS and
GND of cruise control ECU connector when main
switch is held on and off.
Remove cruise control ECU with connectors still con-
nected.
Main switch
Repair or replace harness or connector.
Check and replace cruise control ECU.
Voltage
Check continuity between terminals 2 and 4 of cruise
control switch connector when main switch is held on
and off.
(1) Remove steering wheel center pad (See page
RS Section).
(2) Disconnect cruise control switch connector.
Terminals
Main switch
OFF
Hold ON
Continuity
Check main switch.
Repair or replace harness or connector.
Check and replace cruise control ECU.
Replace control switch.
Check voltage between terminal CMS and GND of cruise control ECU
connector
BE±198± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM