1991 LEXUS SC400 Service Repair Manual

Page 3081 of 4087

LEXUS SC400 1991  Service Repair Manual 
±
STEERING STEERING COLUMNSR±59 
WhereEverybodyKnowsYourName

Page 3082 of 4087

LEXUS SC400 1991  Service Repair Manual 
SR±60±
STEERING STEERING COLUMN 
WhereEverybodyKnowsYourName

Page 3083 of 4087

LEXUS SC400 1991  Service Repair Manual 
LOCATION OF CONNECTORS IN SEAT
±
STEERING STEERING COLUMNSR±61 
WhereEverybodyKnowsYourName

Page 3084 of 4087

LEXUS SC400 1991  Service Repair Manual 
SR±52).
IN±33).
WIRING DIAGRAM
CIRCUIT INSPECTION
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source also supplies power to the CPU and sensor, etc. Power is supplied to the ECU even

Page 3085 of 4087

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

Page 3086 of 4087

LEXUS SC400 1991  Service Repair Manual 
OKNG
3Check DOME Fuse.
C
OK
PRemove DOME Fuse from R/B No. 2.
Check continuity of DOME Fuse.
Continuity
Check for short in all the harness and components con-
nected to DOME Fuse (See attached wiring

Page 3087 of 4087

LEXUS SC400 1991  Service Repair Manual 
±MEMO±
±
STEERING STEERING COLUMNSR±65 
WhereEverybodyKnowsYourName

Page 3088 of 4087

LEXUS SC400 1991  Service Repair Manual 
DTC53Short in Squib Circuit (Between P+ Wire Harness
P
± Wire Harness)
CIRCUIT DESCRIPTION
The squib circuit consists of the center airbag sensor assembly, (squib). It causes the SRS to deploy when