1991 LEXUS SC400 Service Repair Manual

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Page 705 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM CIRCUIT INSPECTION ECU Power Source Circuit CIRCUIT DESCRIPTION This circuit provides power for ECU operation and is also the power source f\ or the slide position sensor. DIAGNOSTIC C

Page 706 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG NGOK OKNG INSPECTION PROCEDURE 1Check DOME fuse. Check for short in all the harness and components con- nected to DOME fuse and repair them (See attached wir- ing diagram). 2Check voltage betwee

Page 707 of 4087

LEXUS SC400 1991 Service Repair Manual Check DOOR fuse.NG OK NG OK NGOK Check for short in all the harness and components connected to the DOOR fuse (See attached wiring diagram). * 1 Check voltage between terminals +B and GND of ECU conn

Page 708 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG NGOK OKNG INSPECTION PROCEDURE 1Check DOOR fuse. Check for short in all the harness components con- nected to the DOOR fuse and repair them (See attached wiring diagram). *1 2Check voltage betwe

Page 709 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM Slide Motor Circuit CIRCUIT DESCRIPTION The passengers seat ECU control the slide motor. DIAGNOSTIC CHARTDIAGNOSTIC CHART Check slide motor.NG NG OK OK Replace motor. Repair or replac

Page 710 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG INSPECTION PROCEDURE 1Check Slide Motor. C OK P(1) Remove Seat (2) Disconnect slide motor connector. Check seat movement when battery voltage is applied to slide motor. Connect positive 

Page 711 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM Position Sensor Circuit CIRCUIT DESCRIPTION The position sensor senses movement of the seat and send pulse signals to the ECU. The position sensor sends pulses to the ECU in proportion

Page 712 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION PROCEDURE 1Position Sensor Check. C Hint P(1) Remove the passengers seat. (2) Remove the bolts for seat rail and lift the seat cush-ion up a little. Notice: If the seat cushion is lift
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