Lexus SC300 / Lexus SC400. Manual — part 205
2. INSPECT RELAY CIRCUIT
Remove the relay from the junction block and inspect the
connector on junction block side as shown.
Relay
Check for
Tester connection
Condition
Specified value
TAIL
Voltage
(1)–Ground
Constant
Battery voltage
(4)–Ground
P/W MAIN
(6)–Ground
If the circuit is not as specified, refer to
and inspect the circuits connected to other parts.
INSPECTION OF RELAY BLOCK NO. 2
1.
INSPECT FUSE CIRCUIT
Remove the fuse from the relay block and inspect the con-
nector on relay block side as shown.
Fuse
Check for
Tester Connection
Condition
Specified value
ABS NO. 1
Voltage
2–Ground
Constant
Battery voltage
AM1
4–Ground
ALT
5–Ground
MAIN
7–Ground
AM2
9–Ground
ABS NO. 2
11–Ground
INT
13–Ground
–
BODY ELECTRICAL SYSTEM
Power Source
BE–21
Fuse
Check for
Tester Connection
Condition
Specified value
HTR
Voltage
(15)–Ground
Constant
Battery voltage
DEF
(17)–Ground
DOME
(24)–Ground
EFI
(26)–Ground
HAZ–HORN
(28)–Ground
RADIO NO. 1
(30)–Ground
TEL
(32)–Ground
ALT–S
(34)–Ground
TRAC
(36)–Ground
HEAD (RH–LWR)
(38)–Ground
Light control switch turned to TAIL or
HEAD (LH–LWR)
(40)–Ground
HEAD and *ENGINE running
HEAD (RH–UPR)
(44)–Ground
Light control switch turned to HEAD and
HEAD (LH–UPR)
(46)–Ground
dimmer switch turned to HI or FLASH
If the circuit is not as specified, refer to
and inspect the circuits connected to other parts.
2. INSPECT
RELAY
CIRCUIT
Remove the relay from the relay block and inspect the con-
nector on relay block side as shown.
Relay
Check for
Tester connection
Condition
Specified value
EFI
Voltage
(4)–Ground
Constant
Battery voltage
ST
(10)–Ground
(11)–Ground
DIM
(15)–Ground
Light control switch turned to TAIL or HEAD
(16)–Ground
and *Engine running
IG2
(18)–Ground
Constant
HTR
(24)–Ground
(25)–Ground
H–LP
(28)–Ground
(30)–Ground
DEF
(34)–Ground
(35)–Ground
If the circuit is not as specified, refer to
and inspect circuits connected to other parts.
BE–22
–
BODY ELECTRICAL SYSTEM
Power Source
INSPECTION OF RELAY BLOCK NO. 4
AND NO. 5 RELAY BLOCK
1.
INSPECT FUSE CIRCUIT
Remove the fuse from the relay block and inspect the con-
nector on relay block side as shown.
Fuse
Check for
Tester connection
Condition
Specified value
STHTR
Voltage
2–Ground
Ignition Switch Turn to ON
Battery voltage
If the circuit is not as specified, refer to
and inspect the circuits connected to other parts.
2. INSPECT
RELAY
CIRCUIT
Remove the relay from the relay block and inspect the con-
nector on junction block side as shown.
Relay
Check for
Tester connection
Condition
Specified value
HORN
Voltage
(8)–Ground
Constant
Battery voltage
IG MAIN
(9)–Ground
(13)–Ground
Continuity
CRNRNG LP
(14)–Ground
Ignition Switch Turned to ON
Battery voltage
(15)–Ground
–
BODY ELECTRICAL SYSTEM
Power Source
BE–23
If the circuit is not as specified, refer to
and inspect the circuits connected to other parts.
INSPECTION OF RELAY BLOCK NO. 6
(ABS and TRAC Relay Block)
INSPECT RELAY CIRCUIT
Remove the relay from the relay block and inspect the con-
nector on junction block side as shown.
Relay
Check for
Tester connection
Condition
Specified value
TRAC SOL
Voltage
(1)–Ground
Constant
Battery voltage
TRAC MTR
(7)–Ground
ABS SOL
(11)–Ground
ABS MIR
(17)–Ground
If the circuit is not as specified, refer to
and inspect circuits connected to other parts.
BE–24
–
BODY ELECTRICAL SYSTEM
Power Source
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