2008 Lexus IS350 Service & Repair Manual
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576
LEXUS IS 350 / 250 (EM0140U)
I GROUND POINT
EFI NO. 2 Relay
Front Controller
EFI MAIN Relay
(–S)
IG2 Relay
(–ST)
ST CUT Relay
(E)
A/F Relay
(E)
A3
(SW)
A4
(E)
A1
(SOL–)
E8
(EC)
A5
2B
3
2F
1
2A
7
2
2
2
(FSW–)
A23
(E1)
A27
(E)
A16
(GND3)
A35
A13
(GND)
(GND2)
A14
FAN NO. 2 Relay
(E)
(E)
A19
A18
(E)
(GND1)
A14
J78
(GND1)
AE1
36
2
1
3
4
7
5 4 12 1
2
3
A2 A3
2
W–B
W–B
W–B
W–B
(∗2)
(∗1)
(∗1)
A1
JA2
17
W–B W–B
W–B
W–B
W–B
(∗1) (∗1)
(∗2)
2
3
4
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
6
W–B
W–B
W–B
W–B
(∗3)
Junction
Connector
A20
Junction
Connector
A15
(∗4)
∗ 1 : w/ Vehicle Dynamics Integrated Management
∗ 2 : w/o Vehicle Dynamics Integrated Management
∗ 3 : w/ Adaptive Front–Lighting
∗ 4 : w/ Headlight Cleaner
∗ 5 : 2GR–FSE
∗ 6 : 4GR–FSE
∗ 7 : w/ HID
Skid Control ECU
with Actuator
Wireless Door Lock
Buzzer
Windshield Wiper
Motor
Skid Control ECU
Headlamp Cleaner
Control Relay
Skid Control ECU
with Actuator
Windshield Washer
Motor
Brake Actuator
Water Level
Warning SW
Skid Control ECU
A/C Compressor
Engine Control
Module
Brake Fluid Level
Warning SW
Headlamp Swivel
ECU
Brake Pedal Road
Sensing SW
Junction
Connector
A9
LEXUS IS 350 / 250 (EM0140U)
577
I
(GND)
A34
(E)
B8
(E)
B12
(E)
(E)
(E)
(E)
(E)
B11
A4 A5
W–B
W–B
W–B
(∗5)
(∗6)
B1
(E)
(E)
B13
B2
(E)
(E)
(E)
(E)
(E)
(E)
B4
B1 B2
W–B W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B W–B W–B
W–B W–B W–B W–B
H1 I1
(
Shielded
)
(
Shielded
)
BR
BR
Ab1
3
(∗5)
W–B
(PGND)
A31
B
b1
(GND)
(∗7)
(∗5)
(∗7)
(
Shielded
)
C1
Smog Ventilation
Sensor
Headlamp Assembly
(LH)
Engine Hood
Courtesy SW
Blower Motor
Cooling Fan Motor
(No. 1)
Headlamp Assembly
(RH)
Fog Lamp
(Front LH)
Fog Lamp
(Front RH)
Power Steering
ECU
Blower Motor
578
LEXUS IS 350 / 250 (EM0140U)
I GROUND POINT
(E03)
(ME01)
(E02)
(E01)
(E04)
(E1)
E3, E4, E5, E6
(MGND)
Q49
B9
(SGND)
(GND)
E32
E33
(GND)
(GND)
E35
E22
(GND)
E23
(GND)
(GND)
E24
B
3
B
4
B
7
(Shielded)
(Shielded)
(Shielded)
A
4
A
6
A
5
A
1
(Shielded)
(Shielded)
A
2
A
3
A
7
B
6
B
1
B
11
BA2
12
JA3
55
17
AQ1
A
9
B
10
B
12
E1
AE1 1
E2
BR
BR
BR BR
BR
BR
BR
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
BR
W–B
W–B W–B
BR
W–B
(∗8) (∗8)
(GND)
Z2
Z1
(GND)
W–B
ZE1
1
ZE2
1
W–B
W–B
(∗6)
(∗6)
W–B
W–B
(∗6)
(∗6)
(∗5)
(∗5)
(GND)
E43
W–B BR
B
5
(Shielded)
B
8
(Shielded)
B
9
E8
(SSR–)
BR
BR (Shielded)
2
B
A
12
8
A (E05)
Junction Connector
A10(A), E1(B)
AE1
26
W–B BR
29
AE1
Ignition Coil
(No. 5)
Engine Control Module
Ignition Coil
(No. 1)
Ignition Coil
(No. 3)
Ignition Coil
(No. 6)
Ignition Coil
(No. 4)
Ignition Coil
(No. 2)
Millimeter Wave
Radar Sensor
Canister Pump
Assembly
Ignition Coil
(No. 4)
Ignition Coil
(No. 6)
Engine Oil
Level Sensor
A/C Compressor
LEXUS IS 350 / 250 (EM0140U)
579
I
J24
(ECC)
J43
(E)
J21
(SG)
(GND)
(SGND)
J17
77
38
48
67
57
58
J66
(GND)
J3
BR
W–B
BR
W–B
BR
BR BR
BR
(GND2)
P27
(GND)
(GND)
P31
(E)
u1
(E)
P13
(E)
P33
N8
(E)
(GND)
N1
(SEL1)
(–)
L12
(GND)
L10
(E)
L8
(E)
L9
(GND)
L13
(GND)
n2
Electrical Key
Oscillator
(Front Door RH)
NP1
5
LP1
17
P2
P3
P1
1
PT1
(A/T)
(∗8)
Junction
Connector
J70
W–B
W–B
W–B
Y
W–B
W–B
W–B
W–B
W–B
W–B W–B
W–B W–B
W–B
W–B
W–B
W–B
BR
W–B W–B
W–B
W–B
W–B
1
8
4
7
9
(∗9)
W–B W–B
Junction Connector
P26
∗ 5 : 2GR–FSE
∗ 9 : w/ Seat Position Memory
∗10 : w/o Seat Position Memory
(∗8)
∗ 6 : 4GR–FSE
∗ 8 : w/ Dynamic Radar Cruise Control
W–B
(–)
L14
(∗9)
(∗10)
8
Ln1
W–B
(Shielded) W–B
Spiral Cable
Transmission Control
SW
Data Link
Connector 3
Radio Receiver
Assembly
Distance Control
ECU
Door Control Receiver
Seat Heater (RH)
Stereo Component
Amplifier
Power Outlet
Socket
Certification ECU
Door Lock Assembly
(Rear RH)
Power Window SW
(Rear RH)
Outer Rear
View Mirror (RH)
Outer Mirror
Control ECU (RH)
Door Lock Assembly
(Front RH)
Door Lock
Control SW
Power Window SW
(Front RH)
Outer Rear
View Mirror (RH)
Pu1
1
Rear Window Defogger
(E)
P19
W–B
W–B
(∗11) (∗12) (∗12)
∗11 : w/ Power Seat
∗12 : w/o Power Seat
(∗11)
580
LEXUS IS 350 / 250 (EM0140U)
I GROUND POINT
(GND)
T6
(E)
T8
(GND)
(E)
T3
(GND)
T13
(GND)
T12
(E)
T2
4
5
9
12
10 11
9
8
11
W–B
W–B
W–B
W–B
W–B W–B
W–B
W–B
(∗11)
(∗11)
(∗11)
Junction Connector
T11
(GND)
U13
(GND)
U12
W–B
W–B
W–B
W–B
W–B
10
8
11
(∗11)
(∗11)
(∗11)
(∗11)
Junction
Connector
U11
∗10 : w/o Seat Position Memory
∗ 9 : w/ Seat Position Memory
(E)
U3
9
(∗9)
W–B
(E)
T15
(∗10)
∗11 : w/ Power Seat
∗12 : w/o Power Seat
∗13 : w/ LEXUS Parking Assist (Clearance Sonar)
∗14 : w/ Rear Sunshade
Position Control ECU
and SW (Front RH Seat)
Power Seat SW
(Front RH Seat
Lumbar Support
Control)
Seat Heater (RH)
Seat Climate
Control Blower
(Front RH
Seat Cushion)
Seat Climate
Control Blower
(Front RH
Seat Back)
Front Seat
Inner Belt (RH)
Seat Climate
Control Blower
(Front LH
Seat Back)
Seat Climate
Control Blower
(Front LH Seat
Cushion)
Seat Heater (LH)
Power Seat SW
(Front RH Seat)
(∗11)
(∗11)
(∗11)
(∗11)
(∗11)
10
W–B
(∗11)
Junction Connector
T14
LEXUS IS 350 / 250 (EM0140U)
581
I
(E)
Q40
(E)
Q46
(E)
Q50
(E)
Q51
Q47
(E)
Q41
(E)
Q45
(E)
Q38
(PGND)
Q37
(E)
Q24
(E)
(GND)
(E)
U14
(E)
(E)
U4
(E)
Q14
(E)
Q25
(E)
Q39
(E)
Q42
(E)
O8
(GND)
O1
(SEL2)
(GND)
o2
Electrical Key
Oscillator
(Front Door LH)
(GND)
M7
(E)
M2
(GND)
M10
(–)
M15
(E)
M9
(E)
M8
OQ1
15
OQ1
5
Q2
A
4
B
1
B
3
B
4
B
2
A
1
B
5
Q1
MQ1
9
2
9
6 12
5
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B W–B W–B
W–B
W–B
W–B
W–B
W–B
W–B
BR
W–B W–B
W–B
W–B
Y
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B W–B
W–B
W–B
W–B
W–B
W–B
W
W–B
(∗12)
(∗11)
W–B
Junction
Connector
Q35
(∗9)
(∗10)
(∗9)
(∗13)
(∗14)
(∗10)
(–)
M11
W–B
8
Mo1
W–B
(∗9)
(∗9)
(E)
(∗10)
U15
W–B
W–B
W–B
Rear Combination
Lamp (LH)
Rear Combination
Lamp (RH)
Rear Combination
Lamp (RH)
License Plate Lamp
(LH)
Luggage Compartment
Door Lock Cylinder
Luggage Electrical
Key SW
Seat Belt Control ECU
Clearance Warning ECU
Rear Sunshade Relay
Rear Combination
Lamp (LH)
Power Seat SW
(Front LH Seat)
Power Seat SW
(Front LH Seat
Lumbar Support
Control)
Front Seat Inner Belt
(LH)
Fuel Suction Pump
and Gage Assembly
Center Stop Lamp
Fuel Lid
Opener Motor
Door Lock Assembly
(Luggage)
Door Lock Assembly
(Rear LH)
Power Window SW
(Rear LH)
Power Window
Master SW
Door Lock Assembly
(Front LH)
Outer Mirror
Control ECU (LH)
Outer Rear View
Mirror (LH)
Outer Mirror SW
Outer Mirror SW
Outer Rear View
Mirror (LH)
Position Control ECU
and SW (Front LH Seat)
U6
Seat Heater (LH)
(E)
v1
C
5
(
∗12
)
(
∗11
)
Junction
Connector
Q7
(
A
)
, U1
(
B
)
, v2
(
C
)
582
LEXUS IS 350 / 250 (EM0140U)
I GROUND POINT
J80
(
B
)
J50
(GND1)
(GND3)
(∗15)
R5
(GND)
(L)
R1
(E)
J57
(L)
J14
(L)
Junction
Connector
A32
(GND)
ACC Relay
PWR POINT Relay
RH–IG1 Relay
Body ECU
(Cowl Side J/B RH)
(∗17)
(GND2)
J47
(E1)
(GND)
J22
J34
(E2)
(4WD)
12
B
(SGND)
J29
J55
(GND2)
(COM)
J31
(GND)
J69
(GND)
JR2
15
JR2
7
JR2
9
J42
11
RD RA
10
RA
4
RA
9
RL
6
(GND1)
13
B
14
J4
RD 7
(GND2)
J78
W–B
RA
5
W–B
20
19
90
89
88
10
60
49
50
40
59
B
W
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B W–B
W–B
W–B
W–B
W–B
W–B
W–B
W–B
W
Junction
Connector
J71
W–B
W–B
W–B
R3
W–B
W–B
W–B
∗14 : w/ Rear Sunshade
∗ 1 : w/ Vehicle Dynamics Integrated Management
(∗1)
(L)
STARTER Relay
(–S)
DEFOG Relay
(E)
NOISE FILTER
(DEF)
1
1
1
W–B W–B
RK
10
W–B
W–B
RD
17
∗15 : w/ LEXUS Navigation System
∗16 : w/o LEXUS Navigation System
∗17 : w/ Power Tilt and Power Telescopic
∗18 : w/ Sliding Roof
Vanity Lamp SW (RH)
Skid Control ECU
Cigarette Lighter
ID Code Box
Power SW
Power Source
Control ECU
Steering Lock ECU
Combination
Meter
Tilt Motor
Airbag Sensor
Assembly Center
4WD Control ECU
Luggage Compartment
Door Opener SW
Luggage Compartment
Door Opener SW (Main)
Vanity Lamp SW (LH)
Overhead J/B
Multi–Display
LEXUS IS 350 / 250 (EM0140U)
583
I
(∗16)
(E)
J36
(E)
(∗15)
(A/T)
(∗14)
J27
Junction Connector
(∗18)
J37
(E)
J41
(GND)
J45
(E)
J58
(GND)
(E)
J16
(E)
J26
(ESS)
J23
J42
(ILL–)
(GND)
J76
(E)
J54
J53
(E)
J2
(GND)
J29
(GND)
J28
J87
J49
(GND)
J48
(E)
J12
(∗18)
(E)
J21
(2WD)
(CG)
J46
(ILL–)
J56
(L)
J47
(E2)
J30
(E)
LH IG1 Relay
LH IG2 Relay
Body ECU
(Cowl Side
J/B LH)
(SGND)
(E)
W–B
W–B
LA 1
LD 12
9 LD
LA
7
LA
6
LD 8
J1
25
JR2
100
W–B
W–B
W–B
10
W–B
W–B
20
W–B
W–B
W–B 99
W–B
W–B
W–B
60
W–B
W–B
50
W–B
W–B
W–B 40
W–B
W–B
30
79
20
90
90
W–B
69
19
60 W–B
99
40
70
W–B
89
78
98
W–B
W–B
10
W–B
W–B W–B
W–B
W–B
W–B
W–B
W–B
(M/T)
W–B
(A/T)
(Shielded)
J34
(∗15)
(∗17)
(GND) LD
3
W–B
(ES)
W–B 29
(∗15)
(
∗17
)
Junction Connector
J70
Combination Meter
Turn Signal
Flasher
Airbag Sensor
Assembly Center
Glove Box Lamp
Console Box Lamp
Data Link Connector 3
Rear Sunshade SW
Shift Lock Control
ECU
Tire Pressure
Warning ECU
ETCS Snow SW
Tilt and Telescopic
ECU
Steering Lock ECU
Clock Assembly
Integration
Control and Panel
Assembly
Gateway ECU
Cigarette Lighter
Steering Sensor
Windshield Wiper
SW Assembly
Satellite SW
A/C Amplifier
Seat Heater SW
Yaw Rate Sensor
Traction Control SW
Electronically
Controlled Transmission
Pattern Select SW
R6
Sliding Roof
Control ECU
584
LEXUS IS 350 / 250 (EM0140U)
I GROUND POINT
: Parts Location
Code See Page Code See Page Code See Page
A9
50 (2GR–FSE)
E1 B
52 (2GR–FSE) Q7 A 66
A9
54 (4GR–FSE)
E1 B
56 (4GR–FSE) Q35 64
A10 A
50 (2GR–FSE) J27 58 T11 66
A10 A
54 (4GR–FSE) J70 60 T14 66
A15
50 (2GR–FSE) J71 60 U1 B 66
A15
54 (4GR–FSE) J80 B 60 U11 66
A20 61 P26 63
: Relay Blocks
Code See Page Relay Blocks (Relay Block Location)
1 22 Engine Room R/B No.1 (Near the Battery)
2 26 Engine Room R/B No.2 (Engine Compartment Left)
:
Junction Block and Wire Harness Connector
Code See Page Junction Block and Wire Harness (Connector Location)
2A
27 Engine Room Main Wire and Engine Room J/B No.2 (Engine Compartment Left) 2B 27 Engine Room Main Wire and Engine Room J/B No.2 (Engine Compartment Left)
2F
LA
35 Instrument Panel Wire and Cowl Side J/B LH (Cowl Side Left)
LD
35 Instrument Panel Wire and Cowl Side J/B LH (Cowl Side Left)
RA
41 Instrument Panel Wire and Cowl Side J/B RH (Cowl Side Right)
RD
41 Instrument Panel Wire and Cowl Side J/B RH (Cowl Side Right)
RK
42 Engine Room Main Wire and Cowl Side J/B RH (Cowl Side Right)
RL
42 Engine Room Main Wire and Cowl Side J/B RH (Cowl Side Right)
: Connector Joining Wire Harness and Wire Harness
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
AE1
68 (2GR–FSE)
Engine Room Main Wire and Engine Wire (Inside of the ECU Box) AE1
69 (4GR–FSE)
Engine Room Main Wire and Engine Wire (Inside of the ECU Box)
AQ1 70 Engine Room Main Wire and Floor No.2 Wire (Upper the Cowl Side Panel LH)
Ab1 70 Engine Room Main Wire and Wiring A/C No.2 Harness Sub Assembly (Near the Blower Motor)
BA2
68 (2GR–FSE)
Engine Room No.2 Wire and Engine Room Main Wire (Inside of the Engine Room R/B No.2) BA2
69 (4GR–FSE)
Engine Room No.2 Wire and Engine Room Main Wire (Inside of the Engine Room R/B No.2)
JA2
70 Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)
JA3
70 Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)
JR2 70 Instrument Panel Wire and Roof Wire (Front Pillar LH)
LP1 70 Front Door RH Wire and Floor No.1 Wire (Cowl Side Panel RH)
Ln1 71 Front Door RH Wire and Electrical Key Wire Harness Front RH (Front Door RH)
MQ1 70 Front Door LH Wire and Floor No.2 Wire (Cowl Side Panel LH)
Mo1 71 Front Door LH Wire and Electrical Key Wire Harness Front LH (Front Door LH)
NP1 71 Rear Door No.1 Wire and Floor No.1 Wire (Center Pillar RH)
OQ1 71 Rear Door No.2 Wire and Floor No.2 Wire (Center Pillar LH)
PT1 72 Floor No.1 Wire and Front Seat RH Wire (Under the Front RH Seat)
ZE1
69 (4GR–FSE) Ignition Coil Wiring Sub Assembly and Engine Wire (Upper the Left Cylinder Head)
ZE2
69 (4GR–FSE) Ignition Coil Wiring Sub Assembly and Engine Wire (Upper the Left Cylinder Head)
LEXUS IS 350 / 250 (EM0140U)
585
I
: Ground Points
Code See Page Ground Points Location
A1
68 (2GR–FSE)
Rear Side of the Left Fender Apron
A1
69 (4GR–FSE)
Rear Side of the Left Fender Apron A2
68 (2GR–FSE)
Rear Side of the Left Fender Apron A2
69 (4GR–FSE)
Rear Side of the Left Fender Apron
A3
68 (2GR–FSE)
A3
69 (4GR–FSE)
A4
68 (2GR–FSE)
Rear Side of the Right Fender Apron
A4
69 (4GR–FSE)
Rear Side of the Right Fender Apron
A5
68 (2GR–FSE)
Rear Side of the Right Fender Apron
A5
69 (4GR–FSE)
B1
68 (2GR–FSE)
Front Side of the Right Fender Apron B1
69 (4GR–FSE)
Front Side of the Right Fender Apron
B2
68 (2GR–FSE)
Front Side of the Left Fender Apron B2
69 (4GR–FSE)
Front Side of the Left Fender Apron
C1
68 (2GR–FSE)
Near the Power Steering Motor C1
69 (4GR–FSE)
Near the Power Steering Motor
E1
68 (2GR–FSE)
Rear Side of the Left Cylinder Head E1
69 (4GR–FSE)
Rear Side of the Left Cylinder Head
E2
68 (2GR–FSE)
Rear Side of the Right Cylinder Head E2
69 (4GR–FSE)
Rear Side of the Right Cylinder Head
H1
68 (2GR–FSE)
Front Side of the Right Cylinder Head
H1
69 (4GR–FSE)
Front Side of the Right Cylinder Head
I1
68 (2GR–FSE)
Front Side of the Right Cylinder Head
I1
69 (4GR–FSE)
J1 70 Left Kick Panel
J2 70 Left Side of the Shift Lever
J3 70 Right Side of the Shift Lever
J4 70 Right Kick Panel
P1 71 Right Side of the Front Crossmember
P2 71 Right Side of the Upper Back Panel
P3 71 Roof Side Inner Rear Panel RH
Q1 71 Left Side of the Front Crossmember
Q2 71 Roof Side Inner Rear Panel LH
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If you are in need of a repair manual for your 2008 Lexus IS350, look no further. This comprehensive manual is designed to assist both professional mechanics and DIY enthusiasts in performing a wide range of repairs and maintenance tasks.
In the past, obtaining service information required purchasing traditional paper manuals at a higher cost. However, this digital format offers a more affordable and convenient alternative, providing access to essential details for fixing brakes, engines, suspension, steering, drivetrain, electrical systems, heating, air conditioning, and more.
Whether you are addressing brake issues, replacing suspension components, or conducting standard maintenance, this manual has you covered. It is compatible with Windows, Mac computers, smartphones, and tablets, ensuring easy access to the information you need to work on your vehicle and save on repair costs.
