1991 LEXUS SC400 Service Repair Manual

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Page 817 of 4087

LEXUS SC400 1991 Service Repair Manual 2. INSPECT RELAY CIRCUITRemove the relay from the junction block and inspect the connector on junction block side as shown. RelayCheck forTester connectionConditionSpecified value TAILVoltage(1)±Gr

Page 818 of 4087

LEXUS SC400 1991 Service Repair Manual FuseCheck forTester ConnectionConditionSpecified value HTRVoltage(15)±GroundConstantBattery voltage DEF(17)±Ground DOME(24)±Ground EFI(26)±Ground HAZ±HORN(28)±Ground RADIO NO. 1(30)±Ground TEL

Page 819 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF RELAY BLOCK NO. 4 AND NO. 5 RELAY BLOCK 1. INSPECT FUSE CIRCUITRemove the fuse from the relay block and inspect the con- nector on relay block side as shown. FuseCheck forTester connec

Page 820 of 4087

LEXUS SC400 1991 Service Repair Manual If the circuit is not as specified, refer to BE±15 wiring diagram and inspect the circuits connected to other parts. INSPECTION OF RELAY BLOCK NO. 6 (ABS and TRAC Relay Block) INSPECT RELAY CIRCUIT

Page 821 of 4087

LEXUS SC400 1991 Service Repair Manual IGNITION SWITCH Description The ignition switch is supplied with power from the battery via a fusible l\ ink. Power is supplied to each fuse and relay according to the position of the switch, whether

Page 822 of 4087

LEXUS SC400 1991 Service Repair Manual Parts Inspection (Ignition Switch and Key Unlock Warning Switch) REMOVAL AND INSTALLATION OF IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH 1. DISCONNECT BATTERY TERMINALSCAUTION: Work must be started

Page 823 of 4087

LEXUS SC400 1991 Service Repair Manual (Switch circuit) Connect the switch connector and inspect the connector on the wire harness side from the back side as shown. Check forTester connectionConditionSpecified value Voltage2±GroundIgnit

Page 824 of 4087

LEXUS SC400 1991 Service Repair Manual LIGHTING SYSTEM BE±28± BODY ELECTRICAL SYSTEM Lighting System WhereEverybodyKnowsYourName
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