1991 LEXUS SC400 wiring

DIAGNOSTIC CHART
Preparation.
Check front airbag sensor circuit.
(Measure voltage between terminal +SR
or +SL of center airbag sensor assembly
connector and body ground).
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.
Repair or replace harness or connector
between center airbag sensor assembly and
spiral cable. Check front airbag sensor circuit.
(Measure resistance between terminals +SR
and ±SR, +SL and ±SL of center airbag
sensor assembly connector).
Check squib circuit.
Check center airbag sensor assembly.
Check squib.
Check spiral cable.Repair or replace spiral cable.
Go to step [ 7 ].
Replace center airbag sensor
assembly.
Replace steering wheel pad.
Go to Code 15 (See page
AB±68).
Repair or replace harness or
connector between center airbag
sensor assembly and front airbag
sensor (See page AB±20).
WIRING DIAGRAM
AB±49SRS AIRBAG ± Troubleshooting
WhereEverybodyKnowsYourName

DIAGNOSTIC CHART (Cont'd)
Check spiral cable.Repair or replace spiral cable.
Check harness between center airbag
sensor assembly and spiral cable.Repair or replace harness or
connector between center airbag
sensor assembly and spiral cable.
Check center airbag sensor assembly.Replace center airbag sensor
connector.
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.
WIRING DIAGRAM
AB±55SRS AIRBAG ± Troubleshooting
WhereEverybodyKnowsYourName

WIRING DIAGRAM
combination meter
AT±66 combination meter
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±79
WhereEverybodyKnowsYourName

AT±66
IN±33
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±83
WhereEverybodyKnowsYourName

IN±33AT±66
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±87
WhereEverybodyKnowsYourName

AT±66IN±33
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±91
WhereEverybodyKnowsYourName

AT±66
IN±33
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±95
WhereEverybodyKnowsYourName

AT±66
IN±33
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±99
WhereEverybodyKnowsYourName