1991 LEXUS SC400 Service Repair Manual

cruise control coolant level traction control emergency towing coolant temperature horn

Page 3169 of 4087

$LEXUS SC400 1991 Service Repair Manual SYMPTOM SIMULATION ªIntermittent troubles or problemsº are the malfunctions about which the customer \ has a complaint, but which do not occur and can not be confirmed in the workshop. The intermi$

Page 3170 of 4087

$LEXUS SC400 1991 Service Repair Manual 2HEAT METHOD: When the problem seems to occur when the suspect area is heate\ d. Heat the component that is likely the cause of the mal- function with a hair dryer or similar object. Check to see if$

Page 3171 of 4087

$LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC TROUBLE CODE MATRIX CHART If a malfunction code is displayed during the diagnostic trouble code chec\ k, check the circuit listed for that code in the table below (Proceed to the page give$

DIAGNOSTIC TROUBLE CODE MATRIX CHART
If a malfunction code is displayed during the diagnostic trouble code chec\
k, check the circuit listed for that
code in the table below (Proceed to the page given for that circuit).
DTC No.\
\
Diagnosis Page
(Normal)*1\
\
Source voltage drop RS±68
11\
\
Short in squib circuit or front airbag sensor circuit (to ground) RS±70
12\
\
Short in squib circuit or front airbag sensor circuit (to B+) RS±78
13\
\
Short in squib circuit (between D+ wire harness and D± wire harness\
) RS±85
14\
\
Open in squib circuit (between D+ wire harness and D± wire harness)\
RS±92
15\
\
Open in front airbag sensor circuit RS±97
22*2\
\
SRS warning light system malfunction RS±102
31\
\
Center airbag sensor assembly malfunction RS±108
53\
\
Short in squib circuit (between P+ wire harness and P± wire harness\
) RS±110
54\
\
Open in squib circuit (between P+ wire harness and P± wire harness)\
RS±115
HINT:
*
1 When the SRS warning light remains lit up and the diagnostic trouble co\
de is the normal code, this means
a source voltage drop.
*
2 Code 22 is recorded when a malfunction occurs in the SRS warning light \
system. If an open malfunction
occurs in the SRS warning light system, the SRS warning light does not light up, s\
o that until the malfunction
is repaired, the diagnostic trouble code (including 22) cannot be conf\
irmed.
PROBLEM SYMPTOM CHART
Proceed with troubleshooting of each circuit in the table below.
\
\
Problem Symptom Inspection Item Page
\

\

With the ignition switch at ACC or ON, the SRS warning light
sometimes lights up after approx. 6 seconds have elapsed SRS warning light system
(Always lit upwhen ignition switch isRS±119\

\

SRS warning light lights up even when ignition switch is in
the LOCK position (Always lit up when ignition switch is
LOCK position)RS±11 9
\
\
Diagnostic trouble code not displayed. Tc terminal circuitRS±121
\
\
Diagnostic trouble code continuously displayed. Tc terminal circuitRS±121
±
SUPPLEMENTAL RESTRAINT SYSTEM TROUBLESHOOTINGRS±67
WhereEverybodyKnowsYourName

Page 3172 of 4087

$LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM CIRCUIT INSPECTION DTC(Normal)Source Voltage Drop CIRCUIT DESCRIPTION The supplemental restraint system is equipped with a voltage ± increase \ circuit (DC±DC converter) in the cente$

Page 3173 of 4087

LEXUS SC400 1991 Service Repair Manual
YESNO
INSPECTION PROCEDURE
1Preparation.
P1. Turn ignition switch LOCK.
2. Disconnect battery negative (±) terminal cable, andwait at least 90 seconds.
3. Connect battery negative (±) terminal cab

Page 3174 of 4087

LEXUS SC400 1991 Service Repair Manual
DTC11Short in Squib Circuit or Front Airbag Sen-
sor Circuit (to Ground)
CIRCUIT DESCRIPTION
The squib circuit consists of the center airbag sensor assembly, spiral cable and the steering wheel pad (

Page 3175 of 4087

LEXUS SC400 1991 Service Repair Manual
DIAGNOSTIC CHART
DIAGNOSTIC
CHART
(See page RS±49).
(See page RS±48).
±
SUPPLEMENTAL RESTRAINT SYSTEM TROUBLESHOOTINGRS±71
WhereEverybodyKnowsYourName

Page 3176 of 4087

LEXUS SC400 1991 Service Repair Manual
WIRING DIAGRAM
DIAGNOSTIC CHART (Contd)DIAGNOSTIC CHART (Contd)
(See page RS±49).
RS±72±
SUPPLEMENTAL RESTRAINT SYSTEM TROUBLESHOOTING
WhereEverybodyKnowsYourName

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