Lexus ES300 (1997 year). Service manual — part 360

W03875

AB0119

F00256

STP

ON

(–)

(+)

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

DI–217

369

1997 LEXUS ES300 (RM511U)

2

Check voltage between terminal STP of absorber control ECU connector and
body ground.

PREPARATION:
(a)

Remove the No.1 lower panel (See page

BO–82

).

(b)

Turn the ignition switch ON.

CHECK:
Measure voltage between terminal STP of absorber control
ECU connector and body ground when brake pedal is released
and depressed.
OK:

Released

10 – 14 V

Depressed

Below 1.5 V

OK

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

DI–203

).

NG

3

Check harness and connectors between absorber control ECU and stop light
switch (See page

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace absorber control ECU.

W03893

J15

Absorber Control ECU

Absorber Control Switch

W–B

Connector

A

A

II

1

4

2

V

Y

A24

A24

SW2

SW1

3

21

W–B

Junction

DI–218

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

370

1997 LEXUS ES300 (RM511U)

DTC

52

Absorber Control Switch Circuit

CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

52

SW1 and SW2 of absorber control switch signal do not

change.

Absorber control switch

Open or short circuit in between absorber control switch and

absorber control ECU

Absorber control ECU

WIRING DIAGRAM

DI0AO–01

W03876

AB0119

F00257

SW1

ON

(–)

(+)

SW2

W04329

2

3

4

1

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

DI–219

371

1997 LEXUS ES300 (RM511U)

INSPECTION PROCEDURE

1

Check voltage between terminals SW1 and SW2 of absorber control ECU con-
nector and body ground.

PREPARATION:
(a)

Remove the No.1 lower panel (See page

BO–82

).

(b)

Using SST, connect between terminals Ts and E1 of
DLC1.
SST

09843–18020

(c)

Turn the ignition switch ON.

CHECK:
Measure voltage between terminals SW1 and SW2 of absorber
control ECU connector and body ground when move slowly
moving the absorber control switch ”COMFROT”

↔

”SPORT”

both ways one.
OK:
SW1:

Absorber control switch 1

8 V or more

Absorber control switch 2

Below 1.5 V

SW2:

Absorber control switch 3

8 V or more

Absorber control switch 4

Below 1.5 V

OK

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

DI–203

).

NG

W03877

1

3

2

1

2

3

DI–220

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

372

1997 LEXUS ES300 (RM511U)

2

Check absorber control switch.

PREPARATION:
(a)

Remove the upper control panel (See page

BO–82

).

(b)

Disconnect the absorber control switch connector.

CHECK:
Check continuity between each terminal of absorber control
switch when each switch position.
OK:
Absorber control switch 3:

Terminals 2 and 3

Continuity

Absorber control switch 2:

Terminals 1 and 2

Continuity

Terminals 2 and 3

Continuity

Absorber control switch 1:

Terminals 1 and 2

Continuity

NG

Replace absorber control switch.

OK

3

Check harness and connectors between absorber control ECU and absorber
control switch and body ground (See page

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace absorber control ECU.