1991 LEXUS SC400 Service Repair Manual

Page 809 of 4087

LEXUS SC400 1991  Service Repair Manual 
Parts Location (Contd)
±
BODY ELECTRICAL SYSTEM Power SourceBE±13 
WhereEverybodyKnowsYourName

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LEXUS SC400 1991  Service Repair Manual 
Parts Location (Contd)
BE±14±
BODY ELECTRICAL SYSTEM Power Source 
WhereEverybodyKnowsYourName

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LEXUS SC400 1991  Service Repair Manual 
Wiring Diagram
±
BODY ELECTRICAL SYSTEM Power SourceBE±15 
WhereEverybodyKnowsYourName

Page 812 of 4087

LEXUS SC400 1991  Service Repair Manual 
Replacement of Relays
REPLACEMENT OF RELAY IN RELAY
BLOCK NO. 1, NO. 4 and NO. 5
1.  REMOVE FOLLOWING PARTS:(See page  BO±112)
(a)  No. 1 under cover.
(b) Door scuff plate.
(c) Floor carpet.
2.  REM

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LEXUS SC400 1991  Service Repair Manual 
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 fro

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LEXUS SC400 1991  Service Repair Manual 
Description
The power source supplies power to each of the vehicles electrical devices. It is composed of the battery, fuses
and relays, which are located centrally at relay block No. 2 and relay bl

Page 815 of 4087

LEXUS SC400 1991  Service Repair Manual 
No.Part NameRelated Systems or Parts
22MAIN   Upstream of ALT±S and EFI Fuse
23AM2   Charging System   Engine23AM2   AIR±BAG System
24ABS NO. 2   ABS and TRAC
25INJ   Charging System    Engi

Page 816 of 4087

LEXUS SC400 1991  Service Repair Manual 
Inspection of Power Source Circuit
INSPECTION OF JUNCTION BLOCK NO. 1
1.  INSPECT FUSE CIRCUITRemove the fuse from the junction block and inspect the con-
nector on junction block side as shown.
Fuse