Lexus ES300 (2002 year). Service manual - part 346

F41654

SW1

SW2

A22

21

20

Y

V

IF2

5

4

1

3

ECU1

ECU2

GND

2

W-B

3B

70

SB

IA

8

2R

2L

Driver Side J/B

Passenger Side J/B

A23 
Absorber Control SW

Absorber Control ECU

A22

IF2

Y

W-B

3B

Y

20

8

-

DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

05-227

380

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

C1787/87 ABSORBER CONTROL SWITCH CIRCUIT

CIRCUIT DESCRIPTION

The absorber control switch is a switch which selects the damping force mode of shock absorber.

DTC No.

DTC Detecting Condition

Trouble Area

C1787/87

Absorber control switch signal does not change.

Absorber control switch

Absorber control switch circuit

Absorber control ECU

WIRING DIAGRAM

056AH-01

W04329

C66870

F41636

GND

ECU2

ECU1

SPORT

SEMI-SPOR T

SEMI-COMFOR T

COMFORT

05-228

-

DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

381

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

INSPECTION PROCEDURE

HINT:
Start the inspection from the step 1 in case of using hand-held tester and start from step 2 in case of not
using hand-held tester.

1

READ VALUE OF HAND-HELD TESTER

(a)

Connect the hand-held tester to the DLC3.

(b)

Turn the ignition switch ON and turn the hand-held tester main switch ON.

(c)

Select the item ”DAMPER SW1 (SW2)” in the DATA LIST and read its value displayed on the hand-
held tester.

(d)

Check that the acceleration value of the acceleration sensor observed in the hand-held tester is
changing when the vehicle is bounced.
OK:
Absorber control switch value must be changing.

NG

CHECK AND REPLACE ABSORBER CONTROL
ECU(See page 

01-31

)

OK

2

INSPECT ABSORBER CONTROL SWITCH

(a)

Disconnect the absorber control switch.

(b)

Check the continuity between each terminal of the ab-
sorber control switch at each switch position.
OK:

Absorber control switch ”SPORT” position:

Terminal No. (Terminal name)

Specification

1 (ECU1) - 2 (GND) - 3 (ECU2)

No continuity

Absorber control switch ”SEMI-SPORT” position:

Terminal No. (Terminal name)

Specification

2 (GND) - 3 (ECU2)

Continuity

Absorber control switch ”SEMI-COMFORT” position:

Terminal No. (Terminal name)

Specification

1 (ECU1) - 2 (GND) - 3 (ECU2)

Continuity

Absorber control switch ”COMFORT” position:

Terminal No. (Terminal name)

Specification

1 (ECU1) - 2 (GND)

Continuity

NG

REPLACE ABSORBER CONTROL SWITCH

OK

-

DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

05-229

382

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

3

CHECK HARNESS AND CONNECTOR(ABSORBER CONTROL SWITCH -
ABSORBER CONTROL ECU)

(a)

Check for open and short circuit in harness and connector between absorber control switch and ab-
sorber control ECU (See page 

01-31

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE ABSORBER CONTROL ECU(See page 

01-31

)

F41655

Absorber Control ECU

Passenger Side J/B

D2 DLC3

Driver Side J/B

Tc

P-B

6

A22

2

IF2

2R

2L

8

W-B

IA

SB

(*1)

3B

11

51

71

(*2)

50

70

60

80

13

4

Tc

CG

*1: w/ VSC 
*2: w/o VSC

3B

3B

3B

3B

3B

3B

(*2)

(*1)

(*2)

(*1)

(*1)

P-B

P-B

W-B

8

05-230

-

DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

383

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

TC TERMINAL CIRCUIT

CIRCUIT DESCRIPTION

Making short circuit between terminal Tc and CG of DLC3 will output DTC from the TEM terminal of DLC3.

WIRING DIAGRAM

056AI-01