1991 LEXUS SC400 Service Repair Manual

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Page 2945 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG INSPECTION PROCEDURE 1Check voltage between terminals VC and MSW of ECU connector. C OK PRemove ECU with connectors still connected. Measure voltage between terminals V C and MSW of ECU con

Page 2946 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG 3Check harness and connector between ECU and tilt & telescopic switch (See pa\ ge IN±33). Replace tilt & telescopic switch. Check and replace ECU. SR±86± STEERING STEERING COLUMN WhereEvery

Page 2947 of 4087

LEXUS SC400 1991 Service Repair Manual ±MEMO± ± STEERING STEERING COLUMNSR±87 WhereEverybodyKnowsYourName

Page 2948 of 4087

LEXUS SC400 1991 Service Repair Manual SR±52). IN±33). WIRING DIAGRAM Set Switch Circuit CIRCUIT DESCRIPTION When switch 1 or 2 is pushed while SET switch is being pushed ON in memory o\ peration, a signal is sent to the ECU to memorize

Page 2949 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG OKNG INSPECTION PROCEDURE 1Check voltage between terminals MRY and ECU±E of ECU connector. C OK PRemove ECU with connectors still connected. Measure voltage between terminals MRY and ECU±

Page 2950 of 4087

LEXUS SC400 1991 Service Repair Manual SR±52). IN±33). WIRING DIAGRAM Memory & Return Switches Circuit CIRCUIT DESCRIPTION A memory command signal when switch 1 or 2 pushed while SET switch is being pushed ON or a return command signal

Page 2951 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG OKNG INSPECTION PROCEDURE 1Check voltage between terminals M1, M2 and ECU±E of ECU connector. C OK PRemove ECU with connectors still connected. Measure voltage between terminals M1, M2 and

Page 2952 of 4087

LEXUS SC400 1991 Service Repair Manual SR±52). WIRING DIAGRAM Ignition Switch Circuit CIRCUIT DESCRIPTION The ON, OFF signal from the IG switch is sent to the ECU. DIAGNOSTIC CHARTDIAGNOSTIC CHART SR±92± STEERING STEERING COLUMN Where
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