Lexus SC300 / Lexus SC400. Service manual — part 61
11. DIAGNOSTIC CODE CHECK
After repeating ignition switch ON–OFF operation (ON: wait 20 secs., OFF: wait 20 secs.) 5 times, check
the diagnostic codes. If only code 41 is displayed, proceed to step [ 12 ]. If a code other than code 41 is
displayed, return to step [ 7 ] and troubleshoot the displayed malfunction code.
NOTICE: When connecting the battery after clearing the malfunction code, always do it with the ignition
switch in LOCK position. When the battery has been reconnected, turn the ignition switch to ACC or ON
position after at least 2 seconds have elapsed.
If the battery is reconnected with the ignition switch in ACC or ON position, or the ignition switch is turned
ACC or ON within 2 seconds of connecting the battery, it is possible that the diagnosis system will not oper-
ate normally.
12. CLEARING OF MALFUNCTION CODE 41 STORED IN MEMORY
Clear malfunction code 41 stored in memory. This operation is not necessary only in case that the power
source voltage returns to normal.
13. CONFIRMATION
TEST
Check the warning light again and confirm that all the malfunctions have been repaired. If the warning light
indicates an abnormality, repeat the operation again from step [ 2 ]. If code 41 is output at step [ 3 ], skip
steps [ 4 ] and [ 5 ] and proceed to step [ 7 ].
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AIRBAG – Troubleshooting
Customer Problem Analysis
Diagnostic Code Check and Recording
P.
P.
Warning Light Check
P.
Diagnostic Code Check and Recording
P.
Clearing of Malfunction Code (Except Code 41)
P.
Diagnostic Code Chart
P.
Circuit Inspection
P.
Identification of Problem
Repair
Vehicle Brought to Workshop
Symptom Simulation
P.
Clearing of Malfunction Code (Except Code 41)
P.
Diagnostic Code Check
P.
Clearing of Malfunction Code 41 Stored in Memory
P.
Confirmation Test
END
Only Code 41 Output
Output Other Than Code 41
Output Other Than Code 41
Only Code 41
Output
Output Other Than
Code 41
Only Code 41
Output
Does Not Light Up
Normal Code
Malfunction Code
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AIRBAG – Troubleshooting
Customer Problem Analysis Check Sheet
SRS
AIRBAG System Check Sheet
Registration No.
Customer’s Name
Registration Year
/ /
Frame No.
Date Vehicle
Brought In
/ /
Odometer Reading
Km
Miles
Date of Problem Occurrence
/ /
Weather
Fine
Cloudy
Rainy
Snowy
Various/Other
Conditions
Outdoor
Temperature
Hot
Warm
Cool
Cold (Approx.
C (
F))
Conditions
at Time
of Problem
Occurrence
Vehicle
Operation
Starting
Idling
Driving
Constant speed
Acceleration
Deceleration
Other]
[
Condition
of road
Details of Problem
Vehicle Inspection,
Repair History Prior
to Occurrence of
Malfunction
(Including Airbag
System)
(Diagnosis System Inspection)
Airbag Warning
1st Time
Remain On
Sometimes Lights Up
Does Not Light Up
Airbag Warning
Light Inspection
2nd Time
Remain On
Sometimes Lights Up
Does Not Light Up
Diagnostic Code
1st Time
Normal Code
Malfunction Code [Code.
]
Diagnostic Code
Inspection
2nd Time
Normal Code
Malfunction Code [Code.
]
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AIRBAG – Troubleshooting
Inspector’s
Name:
Diagnosis Inspection
AIRBAG WARNING LIGHT CHECK
(a) Turn the ignition switch to ACC or ON and check that the
airbag warning light lights up.
(b) Check that the airbag warning light goes out after
approx. 6 seconds.
HINT:
•
When the ignition switch is at ACC or ON and the airbag
warning light remains on, the center airbag sensor
assembly has detected a malfunction code.
•
If, after approx. 6 seconds have elapsed, the airbag
warning light sometimes lights up or the airbag warning
light lights up even when the ignition switch is OFF, a
short in the airbag warning light circuit can be
considered likely. Proceed to Airbag warning light
system (always lit up) on page
DIAGNOSTIC CODE CHECK
1.
OUTPUT DIAGNOSTIC CODE
(a) Turn the ignition switch to ACC or ON position and wait
approx. 20 seconds.
(b) Using SST, connect terminals Tc and E
1
of the TDCL.
SST 09843–18020
NOTICE: Never make a mistake with the terminal connec-
tion position as this will cause a malfunction.
2.
READ DIAGNOSTIC CODE
Read the diagnostic code as indicated by the number of
times the airbag warning light blinks.
•
Normal code indication
The light will blink 2 times per second.
•
Malfunction code indication
In the event of a malfunction, the light will blink. The first
number of the code No. will equal the first digit of a
2–digit diagnostic code, and after a 1.5 second pause,
the 2nd number of the code No. will equal the 2nd digit.
If there are two or more codes, there will be a 2.5 second
pause between each.
After all the codes have been output, there will be a 4.0 se-
cond pause and they will all be repeated.
HINT:
•
In the event of a number of trouble codes, indication will
begin from the smaller numbered code to the larger.
•
If a diagnostic code is not output or is continuously
output, proceed to the TC terminal circuit inspection on
page
.
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AIRBAG – Troubleshooting
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