1991 LEXUS SC400 Service Repair Manual

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Page 3177 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG INSPECTION PROCEDURE 1Preparation. P1. Disconnect battery negative (±) terminal cable, andwait at least 90 seconds. 2. Remove steering wheel pad (See page RS±19). 3. Disconnect connectors o

Page 3178 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG 3Check front airbag sensor circuit. (Measure resistance between terminals +SR\ and +SL of cen- ter airbag sensor assembly connector and body ground.) C OK Measure resistance between termin

Page 3179 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG 5Check P squib circuit. OK PFor the connector (on the center airbag sensor assem- bly side) between the center airbag sensor assembly and front passenger airbag assembly, measure the re- si

Page 3180 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG 7Check D squib. C OK Hint P1. Turn ignition switch LOCK. 2. Disconnect battery negative (±) terminal cable, andwait at least 90 seconds. 3. Connect steering wheel pad (squib) connector. 4

Page 3181 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG From the results of the above inspection, the malfunctioning part can now be\ considered normal. To make sure of this, use the simulation method to check. 9Check front airbag sensor. C OK

Page 3182 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM DTC12 wShort in Squib Circuit of Front Airbag Sensor Circuit (to B+) w Open in Front Airbag Sensor Circuit CIRCUIT DESCRIPTION The squib circuit consists of the center airbag sensor a

Page 3183 of 4087

LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART (See page RS±48). (See page RS±49). ± SUPPLEMENTAL RESTRAINT SYSTEM TROUBLESHOOTINGRS±79 WhereEverybodyKnowsYourName

Page 3184 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG INSPECTION PROCEDURE 1Preparation. P1. Disconnect battery negative (±) terminal cable, andwait at least 90 seconds. 2. Remove steering wheel pad (See page RS±19). 3. Disconnect connectors o
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