mirror LEXUS SC400 1991 Service Manual PDF

172
REMOTE CONTROL MIRROR (w/ DRIVING POSITION MEMORY)
CURRENT IS ALWAYS APPLIED TO TERMINAL +B OF REMOTE CONTROL MIRROR ECU THROUGH THE ECU±B FUSE.
WHEN THE IGNITION SW IS TURNED TO ON OR ACC POSITION, THE CURRENT FLOWS TO TERMINAL ACC OF THE REMOTE
CONTROL MIRROR ECU THROUGH THE RADIO NO. 2 FUSE.
REMOTE CONTROL MIRROR OPERATION
WHEN THE IGNITION SW IS TURNED TO ON OR ACC POSITION, THE REMOTE CONTROL MIRROR ECU OPERATES. WHEN THE
SELECT SW OF THE REMOTE CONTROL MIRROR SW IS MOVED TO THE LH POSITION AND THE OPERATION SW IS MOVED TO
ªLEFTº SIDE, A SIGNAL IS INPUT FROM TERMINAL SWO2 OF REMOTE CONTROL MIRROR ECU TO TERMINAL 2 OF REMOTE
CONTROL MIRROR SW " TERMINAL 12 "TERMINAL SWI2 OF ECU.
AS A RESULT, THE CURRENT TO TERMINAL +B OF ECU FLOWS FROM TERMINAL MHL OF ECU "TERMINAL 1 OF REMOTE
CONTROL MIRROR LH " MOTOR " TERMINAL 2 "TERMINAL M+L OF ECU "TERMINAL GND "GROUND , ROTATING THE MOTOR
TO ADJUST THE ANGLE OF THE LEFT SIDE OF THE OUTER MIRROR (DRIVER'S).
TO CHANGE THE ANGLE OF THE RIGHT SIDE OF THE MIRROR, THE OPERATION SW OF THE REMOTE CONTROL MIRROR SW IS
MOVED TO THE ªRIGHTº SIDE.
THEN, A SIGNAL IS INPUT FROM TERMINAL SWO2 OF REMOTE CONTROL MIRROR ECU " TERMINAL 2 OF REMOTE CONTROL
MIRROR SW " TERMINAL 8 "TERMINAL SWI1 OF ECU. AS A RESULT, THE CURRENT TO TERMINAL +B OF REMOTE CONTROL
MIRROR ECU FLOWS FROM TERMINAL M+L OF ECU " TERMINAL 2 OF REMOTE CONTROL MIRROR " MOTOR " TERMINAL 1 "
TERMINAL MHL OF ECU " TERMINAL GND " GROUND, CAUSING THE ANGLE OF THE OUTER MIRROR (DRIVER'S) TO CHANGE ON
THE RIGHT SIDE.
THE MOVEMENT TO OTHER POSITIONS OCCURS SIMILARLY, SO ONLY THE CURRENT FLOW TO EACH MOTOR IS SHOWN:
SELECT SW RH POSITION, OPERATION SW LEFT POSITION
TERMINAL +B OF REMOTE CONTROL MIRROR ECU "TERMINAL MHR "TERMINAL 1 OF REMOTE CONTROL MIRROR " MOTOR "
TERMINAL 2 "TERMINAL M+R OF ECU "TERMINAL GND "GROUND .
SELECT SW RH POSITION, OPERATION SW RIGHT POSITION
TERMINAL +B OF REMOTE CONTROL MIRROR ECU "TERMINAL M+R "TERMINAL 2 OF REMOTE CONTROL MIRROR " MOTOR "
TERMINAL 1 "TERMINAL MHR OF ECU " TERMINAL GND "GROUND .
SELECT SW LH POSITION, OPERATION SW UP POSITION
TERMINAL +B OF REMOTE CONTROL MIRROR ECU " TERMINAL MVL " TERMINAL 3 OF REMOTE CONTROL MIRROR " MOTOR "
TERMINAL 2 "TERMINAL M+L OF ECU "TERMINAL GND "GROUND .
SELECT SW LH POSITION, OPERATION SW DOWN POSITION
TERMINAL +B OF REMOTE CONTROL MIRROR ECU "TERMINAL M+L "TERMINAL 2 OF REMOTE CONTROL MIRROR " MOTOR "
TERMINAL 3 "TERMINAL MVL OF ECU " TERMINAL GND "GROUND .
SELECT SW RH POSITION, OPERATION SW UP POSITION
TERMINAL +B OF REMOTE CONTROL MIRROR "TERMINAL MVR "TERMINAL 3 OF REMOTE CONTROL MIRROR " MOTOR "
TERMINAL 2 "TERMINAL M+R OF ECU "TERMINAL GND "GROUND .
SELECT SW RH POSITION, OPERATION SW DOWN POSITION
TERMINAL +B OF REMOTE CONTROL MIRROR "TERMINAL M+R "TERMINAL 2 OF REMOTE CONTROL MIRROR " MOTOR "
TERMINAL 3 "TERMINAL MVR OF ECU " TERMINAL GND "GROUND .
THE NUMBER OF TURNS OF EACH MOTOR (AMOUNT OF MOVEMENT OF EACH PART OF THE MIRROR) IS DETECTED BY THE
POSITION SENSORS AND INPUT TO THE ECU, MAKING IT POSSIBLE TO PERFORM MEMORY AND RETURN FUNCTIONS FOR THE
MIRROR POSITION USING THE DRIVING POSITION MEMORY AND RETURN SWITCH.
SYSTEM OUTLINE
WhereEverybodyKnowsYourName

173
D10 DOOR LOCK MOTOR, DOOR UNLOCK DETECTION SW AND DOOR OPEN DETECTION SW LH
3±6 : CLOSED WITH FRONT DOOR LH OPEN
D12 DRIVING POSITION MEMORY AND RETURN SW
4±3 : CLOSED WITH SET SW ON
2±3 : CLOSED WITH MEMORY NO. 1 SW ON
1±3 : CLOSED WITH MEMORY NO. 2 SW ON
R18 REMOTE CONTROL MIRROR SW 2±12: CONTINUITY WITH SELECT SW AT LH POSITION AND OPERATION SW AT LEFT POSITION
2±8: CONTINUITY WITH SELECT SW AT LH POSITION AND OPERATION SW AT RIGHT POSITION
9±12: CONTINUITY WITH SELECT SW AT RH POSITION AND OPERATION SW AT LEFT POSITION
9±8: CONTINUITY WITH SELECT SW AT RH POSITION AND OPERATION SW AT RIGHT POSITION
3±12: CONTINUITY WITH SELECT SW AT LH POSITION AND OPERATION SW AT UP OPERATION
3±8: CONTINUITY WITH SELECT SW AT LH POSITION AND OPERATION SW AT DOWN POSITION
10±12: CONTINUITY WITH SELECT SW AT RH POSITION AND OPERATION SW AT UP POSITION
10±8: CONTINUITY WITH SELECT SW AT RH POSITION AND OPERATION SW AT DOWN POSITION
R 7 REMOTE CONTROL MIRROR ECU
4±GROUND : ALWAYS APPROX. 12 VOLTS
7±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ACC OR ON POSITION
11±GROUND : ALWAYS CONTINUITY 9±GROUND : APPROX. 12 VOLTS WITH REMOTE CONTROL MIRROR LH AT UP OPERATION
8±GROUND : APPROX. 12 VOLTS WITH REMOTE CONTROL MIRROR LH AT LEFT OPERATION
13±GROUND : APPROX. 5 VOLTS
12±GROUND : ALWAYS CONTINUITY 2±GROUND : APPROX. 12 VOLTS WITH REMOTE CONTROL MIRROR RH AT UP OPERATION
1±GROUND : APPROX. 12 VOLTS WITH REMOTE CONTROL MIRROR RH AT LEFT OPERATION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
D1030R 8B29R1831
D1230R1631T1029
R 7A29R1731
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1D20FRONT DOOR LH WIRE
1H
1I20COWL WIRE
1J
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IF136FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)IF236FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)
IP138FRONT DOOR RH WIRE AND COWL WIRE (RIGHT KICK PANEL)IP238FRONT DOOR RH WIRE AND COWL WIRE (RIGHT KICK PANEL)
BT140FLOOR WIRE AND COWL WIRE (LEFT KICK PANEL)
BU140FLOOR WIRE AND INSTRUMENT PANEL WIRE (LEFT KICK PANEL)
Ba142FLOOR WIRE AND FRONT SEAT LH WIRE (UNDER THE FRONT LH SEAT)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
IF36LEFT KICK PANEL
IG36INSTRUMENT PANEL BRACE LH
IH36UNDER THE ASHTRAY LH
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
I 3I1138COWL WIRE
I 438COWL WIREB 940FLOOR MAIN WIRE
I 5B2746FRONT SEAT LH WIRE
SERVICE HINTS
WhereEverybodyKnowsYourName

174
REMOTE CONTROL MIRROR (w/ DRIVING POSITION MEMORY)
WhereEverybodyKnowsYourName

175
REMOTE CONTROL MIRRORS (w/o DRIVING POSITION MEMORY)
1D
11
MM MM
132
2
3
1
12
92 103 118
IF2
20 IF2 9
1J
1 1D
10
IP1
13 IP1 12 IP1 9 LG±R
W±B W±B
W±B
LG±R
LG±R
LG±R LG±R
LG±R
R±Y
R±Y R±Y
LG
LG±B LG±B LG LG
LG±B LG
BR±B
LG±B
BR±B BR±B
LH RH LH RH
LEFT
RIGHT
UP
DOWN
LEFT
UP
RIGHT
DOWN
SELECT SW OPERATION SW
REMOTE
CONTROL
MIRROR LH REMOTE
CONTROL
MIRROR RH
GR
7. 5A
RADIO NO. 2
REMOTE CONTROL MIRROR SW
B32
R18
R17
R16 FROM POWER SOURCE SYSTEM
(
SEE PAGE 56 )
IF2
8
IF
WhereEverybodyKnowsYourName

176
REMOTE CONTROL MIRRORS (w/o DRIVING POSITION MEMORY)
R18 REMOTE CONTROL MIRROR SW
12±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ACC OR ON POSITION
11±8 : CONTINUITY WITH OPERATION SW AT LEFT OR UP POSITION
3±11 : CONTINUITY WITH OPERATION SW AT RIGHT OR DOWN POSITION
8±GROUND : ALWAYS CONTINUITY
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
R1631R1731R1831
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1D20FRONT DOOR LH WIRE
1J20COWL WIRE
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IF238FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)
IP138FRONT DOOR RH WIRE AND COWL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
IF36LEFT KICK PANEL
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
B 3240FRONT DOOR LH WIRE
21
3 X2 3 XX
X X 8 9 10 11 12
R16, R17 R18
SERVICE HINTS
WhereEverybodyKnowsYourName

192
REAR WINDOW DEFOGGER AND MIRROR HEATER
1B
11C 71D 11H 4
3A
1
1J
1
22
2
1A
5
3G
3
1D
10
22
1E18
IE1
13
IQ1
13
IP1
20
IG1
16 IP1
4
Bc2
10
BL IF IJ
E9
A
10
B
7 2
34
1
12
W±B
BB
B
R±L
R±Y
R±Y
R±Y
R±Y
W±B
W±B L±R B
B
L±R
L±R
B
W±B W±B
W±B
W±B
FROM POWER SOURCE SYSTEM
(
SEE PAGE 56 )
10A
HTR 50A
DEFOGGER 10A
MIR±HTR
DEFOGGER
RE LA Y
REA R
WINDOW
DEFOGGER CHOKE
COILMIRROR
HEATER LH
MIRROR
HEATER RH
RDFGR GND
IQ1
10
W±B
DEFOGGER SW
[A/C CONTROLASSEMBLY]
A12 , A 1 3
C22
R16 R17
B
A
43
2 1EB
B
4 A
7
B
4 A
7
A
8
B
5 A
8
B
5 (
W/ MEMORY )
( W/O MEMORY )
( W/ MEMORY )
( W/O MEMORY )
B
W±B
NOISE FILTERN2
A
1
B
1
BL
R14 , R15 A
B
WhereEverybodyKnowsYourName

177
SRS AIRBAG
NOTICE: When inspecting or repairing the SRS AIRBAG, perform the operation in accord\
ance with the
following precautionary instructions and the procedure and precautions in the Repair Manual for the applicable
model year.

Malfunction symptoms of the airbag system are difficult to confirm, so the diagnostic codes become the most
important source of information when troubleshooting.
When troubleshooting the airbag system, always inspect the diagnostic codes before disconnecting the
battery.

Work must be started after 30 seconds or longer from the time the Ignition SW is set to the ªLOCKº position
and the negative (±) terminal cable is disconnected from the battery.
(The airbag system is equipped with a back±up power source so that if work is started within 30 seconds of
disconnecting the negative (±) terminal cable of the battery, the airbag may be deployed.)
When the negative (±) terminal cable is disconnected from the battery, memory of the clock and audio systems
will be cancelled. So before starting work, make a record of the contents memorized by each me\
mory system.
Then when work is finished, reset the clock and audio system as before.
When the vehicle has tilt and telescopic steering, power seat, outside r\
ear view mirror and power shoulder
belt anchorage, which are all equipped with memory function, it is not possible to make a record of the memory
contents. So when the operation is finished, it will be necessary to explain this\
fact to the customer, and
request the customer to adjust the features and reset the memory.
To avoid erasing the memory of each memory system, never use a back±up \
power supply from outside the
vehicle.

When removing the steering wheel pad or handling a new steering wheel pad, keep the pad upper surfa\
ce
facing upward. Also, lock the lock lever of the twin lock type connector\
at the rear of the pad and take care
not to damage the connector.
(Storing the pad with its metallic surface up may lead to a serious accident if \
the airbag inflates for some
reason).

Store the steering wheel pad where the ambient temperature remains below\
93 °C (200 °F), without high
humidity and away from electrical noise.

Never use airbag parts from another vehicle. When replacing airbag parts\
, replace them with new parts.

Never disassemble or repair the steering wheel pad, center airbag sensor asse\
mbly or front airbag sensors.

Before repairing the body, remove the airbag sensors if during repair shocks are likely to be app\
lied to the
sensors due to vibration of the body or direct tapping with tools or oth\
er parts.

Do not reuse a steering wheel pad or front airbag sensors.
After evaluating whether the center airbag sensor assembly is damaged or not, decide whether or not to reuse
it. (See the Repair Manual for the method for evaluating the center airbag\
sensor assembly.)

When troubleshooting the airbag system, use a high±impedance (Min. 1\
0k W/V) tester.

The vehicle wiring harness exclusively for the airbag system is distinguish\
ed by corrugated yellow tubing, as
are the connectors.

Do not measure the resistance of the airbag squib.
(It is possible this will deploy the airbag and is very dangerous.)

If the wire harness used in the airbag system is damaged, replace the wh\
ole wire harness assembly.
When the connector to the airbag front sensors can be repaired alone (when \
there is no damage to the wire
harness), use the repair wire specially designed for the purpose.
(Refer to the Repair Manual for the applicable Model year for details o\
f the replacement method.)

INFORMATION LABELS (NOTICES) are attached to the periphery of the airbag componen\
ts. Follow the
instructions on the notices.
WhereEverybodyKnowsYourName