Lexus ES300 (1997 year). Manual - part 430

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

DI–497

649

1997 LEXUS ES300   (RM511U)

4

Check vehicle speed sensor (See page 

BE–92

).

NG

Replace vehicle speed sensor.

OK

Check and replace cruise control ECU 
(See page 

IN–27

).

DI–498

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

650

1997 LEXUS ES300   (RM511U)

DTC

    23

Vehicle Speed Signal Abnormal

CIRCUIT DESCRIPTION

See page 

DI–495

.

DTC No.

Detection Item

Trouble Area

23

Vehicle speed sensor pulse is abnormal.

Vehicle speed sensor

Cruise control ECU

WIRING DIAGRAM

See page 

DI–495

.

INSPECTION PROCEDURE

1

Check vehicle speed sensor (See page 

BE–92

).

NG

Replace vehicle speed sensor.

OK

Check and replace cruise control ECU 
(See page 

IN–27

).

DI0ES–01

N21219

Cruise Control ECU

CCS

W–L

W

Cruise Control Switch

 Main Switch

 Control Switch

1J

W–B

5

3

8

W–B

MAIN

CANCEL

SET/COAST

RES/ACC

A

11

10

4

Junction
Connector

J8

II

J8

1J

Junction
Connector

Instrument
Panel J/B

7

C14

C14

CMS

J15

C12

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

DI–499

651

1997 LEXUS ES300   (RM511U)

DTC

   32

Control Switch Circuit (Cruise Control
Switch)

CIRCUIT DESCRIPTION

This circuit carries the SET/COAST, RESUME/ACCEL and CANCEL signals (each voltage) to the ECU.

DTC No.

Detection Item

Trouble Area

32



Short in 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

WIRING DIAGRAM

DI0EU–01

Input Signal

Indicator Light
Blinking Pattern

SET/COAST
switch

RESUME/ACCEL
switch

CANCEL switch

2 Pulses

ON

OFF

ON

OFF

3 Pulses

ON

OFF

SW OFF

SW ON

AB0119

N19911

I00739

ON

CCS

(–)

(+)

DI–500

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

652

1997 LEXUS ES300   (RM511U)

INSPECTION PROCEDURE

1

Input signal check.

PREPARATION:
See input signal check on page 

DI–478

.

CHECK:
Check the indicator light operation when each of the SET/
COAST, RESUME/ACCEL and CANCEL is turned on.
OK:

SET/COAST, RESUME/ACCEL switch
The signals shown in the table on the left should be
output when each switch is ON. The signal should
disappear when the switch is turned OFF.
CANCEL switch
The indicator light goes off when the cancel switch is
turned ON.

OK

Wait and see.

NG

2

Check voltage between terminals CCS of cruise control ECU connector and body
ground.

PREPARATION:
(a)

Remove the ECU with connector still connected.

(b)

Turn ignition switch ON.

CHECK:
Measure voltage between terminals 18 of ECU connector and
body ground, when each of the SET/COAST, RESUME/AC-
CEL and CANCEL  is turned ON.

Switch position

Resistance (V)

Neutral

10 – 16 V

RES/ACC

0.8 – 3.7 V

SET/COAST

2.5 – 6.3 V

CANCEL

4.2 – 8.8 V

NG

Proceed to next circuit inspection shown on
problem symptom table (See page 

DI–487

).

OK