1991 LEXUS SC400 relay

215
TLMT
B
FL+ FL± RL+ RL±
RADIO AND PLAYER
RR+ RR±
IF2
10 IF2 1
IQ 2
6IQ2 7
BT1
5
BU1
6
BV1
10
BV2
10 BV2 9BV24BV2 3
Bc2
12
Bc2
11
IG2
1
IG 2
2
Bc1
20 B
3B 1B6B 2
11 14 13 12
B
4B 12 B5
A
3 C
2C 6D2D 6D1D 3
VOLC VOL+ PWR
MUTE SP± SP+ L
V
L
L
LG
P
B
Y
R
W V PP
V
B
Y
R
W G±R
R±L
R±W G±Y
A/C CONTROL SW AND RADIO SW
TELEPHONE
TRANSCEIVER AND
SPEAKER RELAY RH LHFRONT DOOR SPEAKER LH RH
REAR SPEAKER
A1 5
T16 ,
F12 F11R12 R13
R2 ,
R3 ,
R5
,R6
ABCD
AB 11
22
V
IP 1
10
IP1
1
A
12
A
5
B5
B
12
LG
(
W/ TEL )
LG
LG
(
W/ TEL )
(
W/O TEL )
LG L
L
LG T16 ,
SHORT CONNECTOR
SHORT
CO NNECTOR
L
P
V
B
Y
R
W
C
4C 3
BV2
7BV1 2IQ13IQ2 11
I31 IE1
2
IG2
3
1E
10 2
L±Y
GR
GR
L±Y
L±Y
GR GR
L±Y
L±Y
GR
L±Y
L±Y
L±Y
7. 5A
RADIO
NO. 220A
RA DIO
NO. 1
FROM POWER SOURCE SYSTEM
(
SEEPAGE56 )
SGND
VOLC
VOL+ PWR
11 22
7 8
SGND
ACC
V
T16
,B
B
(
W/O TEL ) V
T1 7
A
T1 7
A
7
T1
WhereEverybodyKnowsYourName

216
RADIO AND PLAYER (w/o CD PLAYER)
R 5(A) RADIO AND PLAYER
(A) 3±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ACC OR ON POSITION
(A) 4±GROUND : ALWAYS APPROX. 12 VOLTS
(A) 7±GROUND : ALWAYS CONTINUITY
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A1528R 3B29T16A31
A3230R 5C29T17B31
F1130R 6D29W 931
F1230R1231W1031
R 2A29R1331
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
219ENGINE COMPARTMENT LEFT
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1C20FLOOR WIRE
1E20INSTRUMENT PANEL WIRE
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IE136ENGINE ROOM MAIN WIRE AND COWL WIRE (R/B NO. 4)
IF236FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)
IG236INSTRUMENT PANEL WIRE AND COWL WIRE (R/B NO. 5)
IP138FRONT DOOR RH WIRE AND COWL WIRE (RIGHT KICK PANEL)
IQ138INSTRUMENT PANEL WIRE AND CONSOLE BOX WIRE (UNDER THE INSTRUMENT PANEL CENTER)IQ238INSTRUMENT PANEL WIRE AND CONSOLE BOX WIRE (UNDER THE INSTRUMENT PANEL CENTER)
BT140FLOOR WIRE AND COWL WIRE (LEFT KICK PANEL)
BU140INSTRUMENT PANEL WIRE AND FLOOR WIRE (LEFT KICK PANEL)
BV140FLOOR NO 3 WIRE AND CONSOLE BOX WIRE (UNDER THE INSTRUMENT PANEL CENTER)BV240FLOOR NO. 3 WIRE AND CONSOLE BOX WIRE (UNDER THE INSTRUMENT PANEL CENTER)
Bc140FLOOR NO 3 WIRE AND FLOOR WIRE (UNDER THE LEFT SIDE OF REAR SEAT CUSHION)Bc240FLOOR NO. 3 WIRE AND FLOOR WIRE (UNDER THE LEFT SIDE OF REAR SEAT CUSHION)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
II36UNDER THE ASHTRAY RH
BM40BACK PANEL CENTER
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
I3138CONSOLE BOX WIREB1940FLOOR NO. 3 WIRE
B1640FLOOR NO. 3 WIRE
SERVICE HINTS
WhereEverybodyKnowsYourName

7XXX XX X
10 12 12
87 BA
N2
C22
A1 3
A12
A(
W/ MEMORY )
R16, R17
54B
R16, R17 (
W/O MEMORY ) 1
R
14 ,
R15
AB
193
DEFOGGER RELAY
2±4 : CLOSED WITH IGNITION SW AT ON POSITION AND DEFOGGER SW (A/C CONTROL ASSEMBLY) ON
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A12B28R14A31R17A31
A13A28R15B31R17B31
C2230R16A31
N 227R16B31
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
219ENGINE COMPARTMENT LEFT
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A20ENGINE ROOM MAIN WIRE1B20ENGINE ROOM MAIN WIRE
1C20FLOOR WIRE
1D20FRONT DOOR LH WIRE
1E20INSTRUMENT PANEL WIRE
1H20COWL WIRE1J20COWL WIRE
3A22INSTRUMENT PANEL WIRE3G22INSTRUMENT PANEL WIRE
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IE136ENGINE ROOM MAIN WIRE AND COWL WIRE (R/B NO. 4)
IG136INSTRUMENT PANEL WIRE AND COWL WIRE (R/B NO. 5)
IP138FRONT DOOR RH WIRE AND COWL WIRE (RIGHT KICK PANEL)
IQ138INSTRUMENT PANEL WIRE AND CONSOLE BOX WIRE (UNDER THE INSTRUMENT PANEL CENTER)
Bc240FLOOR NO. 3 WIRE AND FLOOR WIRE (UNDER THE LEFT SIDE OF REAR SEAT CUSHION)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EB34FRONT SIDE OF LEFT FENDER
IF36LEFT KICK PANEL
IJ36RIGHT KICK PANEL
BL40UNDER THE CENTER PILLAR RH
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E 934ENGINE ROOM MAIN WIRE
SERVICE HINTS
WhereEverybodyKnowsYourName

191
T12 SEAT HEATER SW
7±GROUND : APPROX. 12 VOLTS WITH SW AT ON POSITION
8±GROUND : ALWAYS CONTINUITY
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
S1532S1732S24B29
S1632S1832T12A29
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
423LEFT KICK PANEL (J/B NO. 1 LEFT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1E20INSTRUMENT PANEL WIRE
1J20COWL WIRE
3A22INSTRUMENT PANEL WIRE3H22INSTRUMENT PANEL WIRE
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IG236INSTRUMENT PANEL WIRE AND COWL WIRE (R/B NO. 5)
BU140FLOOR WIRE AND INSTRUMENT PANEL WIRE (LEFT KICK PANEL)
BY140INSTRUMENT PANEL WIRE AND FLOOR NO. 3 WIRE (RIGHT KICK PANEL)
Ba142FLOOR WIRE AND FRONT SEAT LH WIRE (UNDER THE FRONT LH SEAT)Ba242FLOOR WIRE AND FRONT SEAT LH WIRE (UNDER THE FRONT LH SEAT)
Bb142FLOOR NO. 3 WIRE AND FRONT SEAT RH WIRE (UNDER THE FRONT RH SEAT)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
IF36LEFT KICK PANEL
BK40UNDER THE CENTER PILLAR LH
BL40UNDER THE CENTER PILLAR RH
13 2
1
2
3 3X
10 X
78X
S15, S17 S16, S18
ORANGE
1X3 45XBA
S24 T12
SERVICE HINTS
WhereEverybodyKnowsYourName

62
STARTING AND IGNITION
AM1
AM2
11 4
1
6
ST1
IG2
A
1
B 1 1J
6
1J
7
2
22
1B
4 1K
4
6 9 4 14 13 7 M
IE1
16
EB2
1 IE1
15
E19
L±O
L±O B
B
B WW±R
W± RW
W±L
W±RW±L W
W
B±O
B±W
B
B
B
B
W± R
BATTERY
STARTER
31
52
IGNITION SW
40A
IGSW
STARTER
RELAY 7. 5A
ST
FUSE BLOCK
TO THEFT DETERRENT AND
DOOR LOCK ECU 30A AM2
120A ALT
100A AM1
30A INJ
60A MAIN
I15
S6 , S7
F9
BA
3
4
2 1
2
3 IJ1
6
EB1
3
IJ28
IJ1
7
B±O
B
B
B
BB±W B±W
B±W
(A/T )
( M/T )
NEUTRAL
START SW CLUTCH
START SW
N1 C23
( A/T )
( M/T )
2
WhereEverybodyKnowsYourName

64
STARTING AND IGNITION
C 4 COLD START INJECTOR
2±1 : APPROX. 12 VOLTS WHILE START INJECTOR TIME SW IS CLOSED AND STARTER CRANKING
I15 IGNITION SW
4±1 : CLOSED WITH IGNITION SW AT ST POSITION
11±6: CLOSED WITH IGNITION SW AT ON OR ST POSITION
N 1 NEUTRAL START SW
3±2 : CLOSED WITH A/T SHIFT LEVER IN P OR N POSITION
S 6(B), S 7(A) STARTER
POINTS CLOSED WITH NEUTRAL START SW ON AND IGNITION SW AT ST POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C 326F 926N 327
C2328I 227S 6B27
D1326I 427S 7A27
E1028I1529
E1228N 127
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
219ENGINE COMPARTMENT LEFT
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B20ENGINE ROOM MAIN WIRE
1J20COWL WIRE1K20COWL WIRE
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EB134ENGINE WIRE AND ENGINE ROOM MAIN WIRE (FRONT SIDE OF R/B NO 2)EB234ENGINE WIRE AND ENGINE ROOM MAIN WIRE (FRONT SIDE OF R/B NO. 2)
IE136ENGINE ROOM MAIN WIRE AND COWL WIRE (R/B NO. 4)
IJ136ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
IJ236ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
ED34REAR SIDE OF INTAKE MANIFOLD
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E1434ENGINE WIREE1934ENGINE WIREE1834ENGINE WIREE2034ENGINE WIRE
SERVICE HINTS
WhereEverybodyKnowsYourName

86
TAILLIGHT
1K
5 1K
11
1A
31C 16
1J
1 1 2
1
2
E11
E5
1B
2
OFF
TAI L
HEAD
IF G
G
W±B
W±B G
W
W±B W±B G±L LG±BG±W
G±W
G
G
G
G G
W±B
W±B
W±L
4 3103
411
TAILLIGHT
RELAY
FUSE BLOCK COMB INATION
SW
BATTERY
INTEGRATION
RELAY
INTEGRATION
RELAY
15A
TAIL
LIGHT
CONTROL SW
(USA )
( CANADA )
120A ALT
100A AM1
C15
I16
(
CANADA )
I16
(
USA )
W±L
F9 15
23
6 4
(
USA )
( CA NADA )
2
1
FRONT SIDE MARKER
LIGHT LH
F5
FRONT CLEARANCE
LIGHT LH F3
WhereEverybodyKnowsYourName

88
TAILLIGHT
WHEN THE LIGHT CONTROL SW IS TURNED TO TAIL OR HEAD POSITION. THE CURRENT FLOWS TO TERMINAL 3 OF THE LIGHT
FAILURE SENSOR THROUGH THE TAIL FUSE.
WHEN THE IGNITION SW IS TURNED ON, THE CURRENT FLOWS FROM THE GAUGE FUSE TO TERMINAL 8 OF THE LIGHT FAILURE
SENSOR, AND ALSO FLOWS THROUGH THE REAR LIGHT WARNING LIGHT TO TERMINAL 4 OF THE LIGHT FAILURE SENSOR.
TAILLIGHT DISCONNECTION WARNING
WITH THE IGNITION SW ON AND THE LIGHT CONTROL SW TURNED TO TAIL OR HEAD POSITION. IF THE TAILLIGHT CIRCUIT IS
OPEN, THE LIGHT FAILURE SENSOR DETECTS THE FAILURE BY THE CHANGE IN CURRENT FLOWING FROM TERMINAL 3 OF THE
LIGHT FAILURE SENSOR TO TERMINAL 9, 11 AND THE WARNING CIRCUIT OF THE LIGHT FAILURE SENSOR IS ACTIVATED.
AS A RESULT, THE CURRENT FLOWS FROM TERMINAL 4 OF THE LIGHT FAILURE SENSOR " TERMINAL 11 " GROUND AND TURNS
THE REAR LIGHT WARNING LIGHT ON, WHICH REMAINS ON UNTIL THE LIGHT CONTROL SW IS TURNED O\
FF.
TAILLIGHT RELAY
5±3 : CLOSED WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION
L 3 LIGHT FAILURE SENSOR
4, 8±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
3±GROUND : APPROX. 12 VOLTS WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION
11±GROUND : ALWAYS CONTINUITY
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C13B28F 526L 230
C14A28F 626L 330
C1528F 926R1031
F 326I16A29 (USA)R1131
F 426I16B29 (CANADA)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A20ENGINE ROOM MAIN WIRE1B20ENGINE ROOM MAIN WIRE
1C20FLOOR WIRE
1E20INSTRUMENT PANEL WIRE
1J20COWL WIRE1K20COWL WIRE
3A22INSTRUMENT PANEL WIRE3D22INSTRUMENT PANEL WIRE
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
BU140FLOOR WIRE AND INSTRUMENT PANEL WIRE (LEFT KICK PANEL)
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EA34FRONT SIDE OF RIGHT FENDER
IF36LEFT KICK PANEL
BM40BACK PANEL CENTER
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E 1E1134ENGINE ROOM MAIN WIRE
E 434ENGINE ROOM MAIN WIREB1440FLOOR MAIN WIREE 534ENGINE ROOM MAIN WIREB1540FLOOR MAIN WIRE
SYSTEM OUTLINE
SERVICE HINTS
WhereEverybodyKnowsYourName