Lexus SC300 / Lexus SC400. Manual — part 180
NG
OK
OK
NG
3
Check voltage between terminals B1 and E1 of power seat switch connector.
C
OK
P
Remove power seat switch with connector still con-
nected.
Measure voltage between terminal B1 and E1 of power
seat switch connector.
Voltage:
10 – 14 V
Go to step 5.
4
Check continuity between terminal E1 or power seat switch connector and body ground.
C
OK
P
Disconnect power seat switch connector.
Check continuity of E1 terminal.
Resistance:
1
or less
Repair or replace harness or connector.
Check for open and short in harness and connec-
tor between ECU and battery (See page
BE–336
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Passenger’s Seat)
OK
NG
OK
NG
5
Check power seat switch.
C
OK
P
Disconnect power seat switch connector.
Check continuity of each terminal.
Continuity
Terminal
Switch Position
Side
Neutral
Forward
Back
1
3
4
2
Replace power seat switch.
6
Check for open and short in harness and connectors between ECU and power seat switch. (See
page
).
Repair or replace harness or connector.
Check and replace ECU.
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Passenger’s Seat)
BE–337
WIRING DIAGRAM
Buckle Switch Circuit
CIRCUIT DESCRIPTION
Buckle switch signal is sent to ECU when the passenger’s seat belt is fastened.
When the signal is input to ECU, ECU prohibits operation of the power walk–in.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
Check buckle switch.
Check voltage between terminals PBCL
and SGND of ECU connector.
OK
NG
OK
OK
NG
NG
Proceed to next circuit inspection
shown on matrix chart (See page
Replace the buckle switch.
Check the harness and connector between
buckle switch and ECU, ECU and battery.
Repair or replace harness or
connector.
Check and replace ECU.
BE–338
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Passenger’s Seat)
NG
OK
OK
NG
OK
NG
INSPECTION PROCEDURE
1
Check voltage between terminal PBCL and SGND of ECU connector.
C
OK
P
Remote ECU with connectors still connected.
Measure voltage between terminals PBCL and SGND
of ECU connector, when buckle switch is on and off.
With switch ON (Tung plate
is inserted into buckle
switch)
With switch OFF (Tung plate is
inserted into buckle switch)
Below 1 V
10 – 14 V
Proceed to next circuit inspection shown on matrix chart
(See page
2
Check buckle switch.
C
OK
P
Disconnect buckle switch connector.
Check continuity between terminal 1 and 2 of buckle
switch connector.
Terminal
Switch
condition
ON
OFF
Continuity
1
2
Replace buckle switch.
3
Check for open and short in harness and connector between buckle switch and ECU, ECU and
battery (See page
Repair or replace harness or connector.
Check and replace ECU.
–
BODY ELECTRICAL SYSTEM
Power Seat Control System (Passenger’s Seat)
BE–339
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