Lexus SC300 / Lexus SC400. Manual — part 204
REPLACEMENT OF RELAY BLOCK NO. 2
(B) IN RELAY BLOCK NO. 2
1.
REMOVE RELAY BLOCK NO. 2 (B)
(a) Disconnect the battery terminals.
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ”LOCK” position and negative (–) terminal
cable is disconnected from the battery.
(b) Remove the relay block No. 2 cover.
(c) Remove the relay block No. 2 lower cover.
2.
INSTALL RELAY BLOCK NO. 2 (B)
For installation follow the removal procedure in reverse.
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BODY ELECTRICAL SYSTEM
Power Source
BE–17
Description
The power source supplies power to each of the vehicle’s electrical devices. It is composed of the battery, fuses
and relays, which are located centrally at relay block No. 2 and relay block No. 6 in the engine compartment
and junction block No. 1 relay block No. 4 and relay block No. 5 in the cabin near the driver’s feet.
Related systems for each Fuse
No.
Part Name
Related Systems or Parts
1
IGN
Charging System
AIR–BAG System
1
IGN
Engine
2
ST
Starter
3
WIPER
Wiper and Washer System
4
HTR
Defogger System
A/C System
5
ENGINE
Charging System
6
RADIO NO. 2
Audio System
Power Mirror System
Cigarette Lighter
A/C System
7
CIG
Combination Meter System
AIR–BAG System
7
CIG
Shift Lock System
Theft Deterrent System
TEL System
8
STOP
Stop Light System
Cruise Control System
9
TURN
Turn Signal and Hazard
Warning Light System
Cornnering Light System
10
MIR HTR
Mirror Heater System
11
PANEL
Illumination Light System
12
ECU–B
Combination Meter System
AIR–BAG System
Combination Meter System
ECT System
13
GAUGE
Back–Up Light
Transmission Indicator
Light Failare Sensor
ABS and TRAC
Power Seat System
Door Lock Control System
TEL System
Shift Lock System
14
ECU–IG
Radiator Fan
Auto Antenna
Electric Tension Reducer System
Power Steering
Auto–Tilt away Steering
Cruise Control System
15
TAIL
Taillight System
Side Marker
15
TAIL
Clearance Light
16
DOOR
Power Seat System
Luggage Door Opener
16
DOOR
Door Lock Control System
Fuel Lid Opener System
17
IG SW
Upstream of ECU–IG, ENGINE, WIP, HTR, TURN, GAUGE, and ST Fuse
18
PWR
Power Window System
Sliding Roof System
19
ABS NO. 1
ABS and TRAC
20
AM1
Upstream of MIR HTR, TAIL, PANEL, STOP, ECUA–B, DOOR and PWR Fuse
21
ALT
Upstream of DEF, HTR, AM1, and ABS No. 1 Fuse
BE–18
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BODY ELECTRICAL SYSTEM
Power Source
No.
Part Name
Related Systems or Parts
22
MAIN
Upstream of ALT–S and EFI Fuse
23
AM2
Charging System
Engine
23
AM2
AIR–BAG System
24
ABS NO. 2
ABS and TRAC
25
INJ
Charging System
Engine
25
INJ
AIR–BAG System
26
DEF
Defogger System
Power Seat System
Sliding Roof System
A/C System
Liquid Crystal Inner Mirror System
27
DOME
Combination Meter System
Interior Light System
27
DOME
ABS and TRAC
Wireless Door Lock Control System
Cruise Control System
Auto–Tilt away Steering
Theft Deterrent System
28
EFI
Engine
29
HAZ HORN
Turn Signal and Hazard Warning Light System
29
HAZ–HORN
Horn System
30
RADIO NO. 1
Audio System
31
TEL
TEL System
32
ALT–S
Charging System
33
TRAC
ABS and TRAC
34
HEAD (RH–LWR)
Headlight System
35
HEAD (LH–LWR)
Headlight System
36
HEAD (RH–UPR)
Headlight System
37
HEAD (LH–UPR)
Headlight System
38
HTR
Blow Motor
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BODY ELECTRICAL SYSTEM
Power Source
BE–19
Inspection of Power Source Circuit
INSPECTION OF JUNCTION BLOCK NO. 1
1.
INSPECT FUSE CIRCUIT
Remove the fuse from the junction block and inspect the con-
nector on junction block side as shown.
Fuse
Check for
Tester connection
Condition
Specified value
IGN
Voltage
1–Ground
Ignition switch turned to ON
Battery voltage
ST
g
4–Ground
Ignition switch turned to START
y
g
WIPER
5–Ground
Ignition switch turned to ON
HTR
8–Ground
g
ENGINE
9–Ground
RADIO NO. 2
11–Ground
Ignition switch turned to ACC or ON
CIG
14–Ground
g
STOP
15–Ground
Constant
TURN
18–Ground
Ignition switch turned to ON
MIR HTR
20–Ground
Ignition switch turned to ON and defogger
switch turned to ON
PANEL
21–Ground
Light control switch turned to TAIL or HEAD
and *Engine Running
ECU–B
27–Ground
Constant
GAUGE
29–Ground
Ignition switch turned to ON
ECU–IG
32–Ground
g
TAIL
33–Ground
Light control switch turned to TAIL or HEAD
and *Engine Running
DOOR
35–Ground
Constant
IG SW
38–Ground
POWER
39–Ground
If the circuit is not as specified, refer to
and inspect the circuits connected to other parts.
BE–20
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BODY ELECTRICAL SYSTEM
Power Source
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