Lexus ES300 (1997 year). Service manual — part 404

N21462

(Example)
Inspection of
Slide Switch

8

12

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM

DI–393

545

1997 LEXUS ES300 (RM511U)

OK

Proceed to next circuit inspection shown on
matrix chart (See page

DI–374

).

NG

2

Check power seat control switch.

PREPARATION:
Disconnect power seat control switch connector.
CHECK:
Check continuity of each terminal.
OK:

Switch position

Terminal

Neutral

–

Slide switch FRONT

8 – 12

Slide switch BACK

4 – 12

Front vertical switch UP

10 – 12

Front vertical switch DOWN

10 – 12

Rear vertical switch UP

2 – 12

Rear vertical switch DOWN

3 – 12

Reclining switch FORWARD

1 – 12

Reclining switch REARWARD

5 – 12

NG

Replace power seat control switch.

OK

3

Check harness and connectors between Seat Position Control ECU and power
seat control switch (See page

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace Seat Position Control
ECU.

N21267

Seat Memory Switch

Seat Position Control ECU

SW1

SW2

MMRY

5

P

3

BR

9

6

7

BR

BR

BR

SGND

11

1

4

2

V

Y

S15

S15

S15

S15

BS2

IH

N22151

Seat Position Control ECU

Connect

(–)

(+)

SGND

MMRY

SW2 SW1

DI–394

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM

546

1997 LEXUS ES300 (RM511U)

Seat Memory Switch

CIRCUIT DESCRIPTION

Seat memory switch send memory and return signals to the seat position control ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

1

Check voltage between each terminal of the seat memory switch and SGND of
Seat Position Control ECU connector.

PREPARATION:
Remove Seat Position Control ECU with connectors still con-
nected.
CHECK:
Measure voltage between terminal of the seat memory switch
and SGND of Seat Position Control ECU connector.
(The illustration shows inspection of the Memory 1 as an exam-
ple.)
OK:

At each terminal with switch ON

0 V

At each terminal with switch OFF

10

∼

14 V

OK

Proceed to next circuit inspection shown on
matrix chart (See page

DI–374

).

DI0GH–01

N21463

(Example)
Inspection of SET Switch

2

1

–

DIAGNOSTICS

POWER SEAT CONTROL SYSTEM

DI–395

547

1997 LEXUS ES300 (RM511U)

NG

2

Check seat memory switch.

PREPARATION:
Disconnect seat memory switch connector.
CHECK:
Check continuity of each terminal.
OK:

Switch position

Terminal

SET switch ON

1 – 2

Memory switch 1

2 – 3

Memory switch 2

2 – 4

NG

Replace seat memory switch.

OK

3

Check harness and connectors between Seat Position Control ECU and seat
memory switch (See page

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace Seat Position Control
ECU.

DI01P–01

Customer Problem Analysis

Vehicle Brought to Workshop

Problem Symptom Confirmation

Symptom Simulation

Symptom does not occur

Problem Symptom Table

Circuit Inspection

Identification of Problem

Repair

Confirmation Test

End

Titles inside

are titles of pages in this

manual with the page number indicated in the
bottom portion. See the indicated pages
for detailed explanations.

1

2

3

4

5

7

Step 5, 7 : Diagnostic steps permitting the use

of the LEXUS hand–held tester and
LEXUS break–out–box.

P.

DI–397

P.

DI–397

P.

IN–17

P.

DI–406

∼

DI–439

Symptom occur

6

DI–396

–

DIAGNOSTICS

THEFT DETERRENT SYSTEM

548

1997 LEXUS ES300 (RM511U)

THEFT DETERRENT SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:
Troubleshooting of the theft deterrent system is based on the premise that the door lock control system is
operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that
the door lock control system is operating normally.
For troubleshooting using a volt/ohm meter.
Be sure to use troubleshooting procedure appropriate to the diagnostic tool being used.
Perform troubleshooting in accordance with the procedure on the following page.