1991 LEXUS SC400 Service Repair Manual

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Page 785 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG NGOK OKNG OKNG INSPECTION PROCEDURE 1Check DOME fuse. Check for short in all the harness and components con- nected to DOME fuse (See attached wiring diagram). 2Check voltage between terminals +

Page 786 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM Door Unlock Detection Switch Circuit CIRCUIT DESCRIPTION The door unlock detection switch is built into the door lock motor assembly\ . The switch is OFF when the door lock knob is in

Page 787 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK INSPECTION PROCEDURE 1Check voltage between terminals LSWD1, LSWP and LSWD2 of ECU connector a\ nd body ground. C OK P1. Remove the rear seat and RH quarter trim panel. 2. Remove the ECU. 3. Tur

Page 788 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM Door Key Lock and Unlock Switch Circuit (Unlock Side) CIRCUIT DESCRIPTION The door key lock and unlock switch is built into the door key cylinder. When the key is turned to the lock si

Page 789 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK INSPECTION PROCEDURE 1Check voltage between terminal UL1 of ECU connector and body ground. C OK P1. Remove the rear seat and RH quarter trim panel. 2. Remove the ECU. 3. Turn ignition switch on.

Page 790 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM Door Key Lock and Unlock Switch Circuit (Lock Side) CIRCUIT DESCRIPTION Refer to page BE±464. Tr inside the ECU coming ON causes the wireless door lock ECU to output a\ signal to loc

Page 791 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK INSPECTION PROCEDURE 1Check voltage between terminal L1 of wireless door lock ECU connector and bod\ y ground. C OK P1. Remove the rear seat and RH quarter trim panel. 2. Remove the ECU. 3. Turn

Page 792 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM Key Unlock Warning Switch Circuit CIRCUIT DESCRIPTION When the key is inserted in the ignition key cylinder the key unlock warning\ switch comes ON, and when the key is not inserted s
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