Lexus ES300 (1997 year). Manual — part 399
DI0FT–01
N21495
N21496
N21464
I00703
Instrument Panel Junction Block
AM1 Fuse
STOP Fuse
GAUGE Fuse
ECU–IG Fuse
Engine Room Junction Block
ECU–B Fuse
Front Vertical Motor
Slide Motor
Rear Vertical Motor
Seat Position Control ECU
Power Seat Control Switch
Seat Memory Switch
Reclining Motor
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
DI–373
525
1997 LEXUS ES300 (RM511U)
PARTS LOCATION
DI0FV–01
DI–374
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
526
1997 LEXUS ES300 (RM511U)
PROBLEM SYMPTOMS TABLE
Perform troubleshooting of the circuits for the applicable problem symptom in the order given in the chart
below. Proceed to the page located for each circuit.
HINT:
If the instruction ”Proceed to next circuit inspection shown on matrix chart” is given in the flow chart
for each circuit, proceed to the circuit with the next highest number in the table to continue the check.
If the trouble still reappears even though there are no abnormalities in any of the other circuits, then
check and replace the Seat Position Control ECU as the last step.
Symptom
Suspect Area
See page
Both manual & return functions do not operate(All functions).
1. +B power source circuit
2. Power seat control switch circuit
3. Motor circuit
4. Power seat control ECU
Both manual & return functions do not operate(One function only).
1. Motor circuit
2. Power seat control ECU
One or all functions do not operate for manual operation only.
1. Power seat control switch circuit
2. Power seat control ECU
Memory function does not operate.
1. Power seat memory switch circuit
2. Ignition switch circuit
3. Park/neutral position switch circuit
4. Power seat control ECU
Return operation does not stop when brake pedal is depressed.
1. Stop light switch circuit
2. Power seat control ECU
Only return function does not operate or operates a little, then
stops (All return functions).
1. Power seat memory switch circuit
2.ECU power source circuit
3.Position sensor power source circuit
4.Power seat control ECU
Only return function does not operate or operates a little, then
stops (Only one return function).
1. Position sensor circuit
2.Power seat control ECU
DI0FY–01
N21259
BR
Battery
POWER
Instrument Panel J/B
ALT
Seat Position Control ECU
FL MAIN
+B
SGND
GND
L–W
AM1
F/L
J37
Instrument Panel J/B
L–W
L–W
BR
W–B
W–B
IF2
F8
F6
B–R
2
7
1B
1K
1B
1D
3
8
7
9
8
7
8
11
A
A
S14
S15
BS2
S14
BS2
BS2
B–R
B–G
BN
IH
4
2
1
N21258
LOCK
(–)
+B
8
(+)
GND
Seat Position Control ECU
Connect
7
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
DI–375
527
1997 LEXUS ES300 (RM511U)
CIRCUIT INSPECTION
+B Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for motors such as the slide motor, reclining motor, front vertical motor and rear
vertical motor.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check voltage between terminals +B and GND of Seat Position Control ECU con-
nector.
PREPARATION:
Remove Seat Position Control ECU with connectors still con-
nected.
CHECK:
Measure voltage between terminals +B and GND of Seat Posi-
tion Control ECU connector.
OK:
Voltage: 10 – 14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
N21251
GND
Seat Position Control ECU
Disconnect
7
DI–376
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM
528
1997 LEXUS ES300 (RM511U)
NG
2
Check continuity between terminals GND of Seat Position Control ECU connec-
tor and body ground.
CHECK:
Measure resistance between terminals GND of Seat Position
Control ECU connector and body ground.
OK:
Resistance: Continuity (below 1
Ω
)
NG
Repair or replace harness or connector.
OK
3
Check AM1 fuse and POWER fuse.
NG
Check for short in all the harness and compo-
nents connected to the AM1 and POWER fuse,
and repair them (See attached wiring diagram).
OK
Check and repair harness or connector be-
tween Seat Position Control ECU and battery.
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