Lexus ES300 (1997 year). Service manual — part 426

N17520

N17520

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

DI–481

633

1997 LEXUS ES300 (RM511U)

(d)

CANCEL INSPECTION
(1)

Push the main switch ON.

(2)

Drive at a desired speed (40 km/h (25 mph) or high-
er).

(3)

When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.

Depress the brake pedal

Shift to except D position

Push the main switch OFF

Pull the cruise control switch to CANCEL

(e)

RESUME INSPECTION
(1)

Push the main switch ON.

(2)

Drive at a desired speed (40 km/h (25 mph) or high-
er).

(3)

When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.

Depress the brake pedal

Shift to except D position

Push the main switch OFF

Pull the cruise control switch to CANCEL

(4)

After the control switch is turned to RES/ACC at the
driving speed of more than 40 km/h (25 mph), check
that the vehicle restores the speed prior to the can-
cellation.

N17520

(1)

(2)

(1)

No.

Operation Method

CRUISE MAIN Indicator Light
Blinking Pattern

Diagnosis

1

Turn SET/COAST switch ON

2

Turn RES/ACC switch ON

3

Turn CANCEL switch ON

Turn stop light switch ON
Depress brake pedal

Turn PNP switch OFF
(Shift to except D position)

4

Drive at about 40 km/h
(25 mph)or higher

Drive at about 40 km/h
(25 mph) or below

Light

ON

OFF

Light

ON

OFF

Light

ON

OFF

Switch ON

Switch OFF

Light

ON

OFF

Switch OFF

Switch ON

SET/COAST switch circuit
is normal

RES/ACC switch circuit
is normal

CANCEL switch circuit
is normal

Stop light switch circuit
is normal

PNP switch circuit is
normal

Vehicle Speed Sensor is
normal

Light

ON

OFF

Light

ON

OFF

1sec.

0.25 sec.

0.25 sec.

DI–482

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

634

1997 LEXUS ES300 (RM511U)

6.

INPUT SIGNAL CHECK

HINT:

(1) For check No.1

∼

No.3

Turn ignition switch ON.

(2) For check No.4

Jack up the vehicle.

Start the engine.

Shift to D position.

(a)

Press the control switch to SET/COAST or RES/ACC
position and hold it down or hold it up ”1”.

(b)

Push the main switch ON ”2”.

(c)

Check that the CRUISE MAIN indicator light blinks twice
or 3 times repeatedly after 3 seconds.

(d)

Turn the SET/COAST or RES/ACC switch OFF.

(e)

Operate each switch as listed in the table below.

(f)

Read the blinking pattern of the CRUISE MAIN indicator
light.

(g)

After performing the check, turn the main switch OFF.

HINT:
When 2 or more signals are input to the ECU, the lowest num-
bered code will be displayed first.

DI0EJ–01

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

DI–483

635

1997 LEXUS ES300 (RM511U)

DIAGNOSTIC TROUBLE CODE CHART

If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below and proceed to the appropriate page.

DTC No.

(See Page)

Circuit Inspection

Trouble Area

11, 15

(

DI–488

)

Actuator Motor Circuit

Actuator motor

Harness or connector between cruise control ECU and

actuator motor

Cruise control ECU

12

(

DI–490

)

Actuator Magnetic Clutch Circuit

STOP Fuse

Stop light switch

Actuator magnetic clutch

Harness or connector between cruise control ECU and

actuator magnetic clutch, actuator magnetic clutch and body

ground

Cruise control ECU

14

(

DI–493

)

Actuator Mechanical Malfunction

Actuator motor (actuator lock: motor, arm)

Cruise control ECU

21

(

DI–493

)

Open in Vehicle Speed Sensor Circuit

Combination meter

Harness or connector between cruise control ECU and com-

bination meter, combination meter and vehicle speed sensor

Vehicle speed sensor

Cruise control ECU

23

(

DI–498

)

Vehicle Speed Signal Abnormal

Vehicle speed sensor

Cruise control ECU

32

(

DI–499

)

Control Switch Circuit

Cruise control switch

Harness or connector between cruise control ECU and cruise

control switch, cruise control switch and body ground

Cruise control ECU

41

Cruise control ECU

Cruise control ECU

42

Source voltage drop

Power source

51

(

DI–502

)

Idle Signal Circuit

Throttle position sensor

Harness or connector between ECM and throttle position

sensor

Harness or connector between cruise control ECU and ECM

Cruise control ECU

DI0EK–01

N21505

N21506
N12490

I00642

Stop Light Switch

Cruise Control Actuator

Actuator Motor

Actuator Magnetic Clutch

Engine Room Junction Block No.2

ECU–B Fuse

Cruise Control ECU

Cruise Control switch

Main Switch

Control Switch

DLC2

Instrument Panel Junction Block No.1

ECU–IG Fuse

STOP Fuse

Vehicle Speed Sensor

Park/Neutral Position Switch

CRUISE MAIN Indicator Light

DI–484

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

636

1997 LEXUS ES300 (RM511U)

PARTS LOCATION