Lexus RX300 (MCU15). Manual — part 268
DI6OX–01
Supplemental Restraint System Check Sheet
Date Problem Occurred
Customer’s Name
Registration No.
Registration Year
Frame No.
Odometer Reading
Weather
Temperature
Vehicle Operation
Road Conditions
Details Of Problem
Vehicle Inspection, Repair Histo-
ry Prior to Occurrence of Mal-
function (Including Supplemen-
tal Restraint System)
Diagnosis System Inspection
SRS Warning Light
Inspection
DTC Inspection
1st Time
2nd Time
1st Time
2nd Time
Inspector’s
Name
Fine
Cloudy
Rainy
Snowy
Other
Approx.
Starting
Idling
Driving
[
Constant speed
Acceleration
Deceleration
Other
]
Remains ON
Sometimes Lights Up
Does Not Light Up
Remains ON
Sometimes Lights Up
Does Not Light Up
Normal Code
Malfunction Code
Normal Code
Malfunction Code
[ Code.
]
[ Code.
]
km
Miles
/
/
/
/
/
/
Date Vehicle Brought In
DI–304
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
CUSTOMER PROBLEM ANALYSIS CHECK
H05060
DI6OY–08
H10658
DLC3
CG
Tc
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–305
LEXUS RX300 (RM785E)
PRE–CHECK
1.
SRS WARNING LIGHT CHECK
(a)
Turn the ignition switch to the ON position and check that
the SRS warning light lights up.
(b)
Check that the SRS warning light goes out after approx.
6 seconds.
HINT:
S
When the ignition switch is at ON and the SRS warning
light remains on or flashes, the airbag sensor assembly
has detected a malfunction code.
S
If, after approx. 6 seconds have elapsed, the SRS warn-
ing light sometimes lights up or the SRS warning light
lights up even when the ignition switch is OFF, a short in
the SRS warning light circuit can be considered likely.
Proceed to ”SRS warning light circuit malfunction” on
page DI-434.
2.
DTC CHECK (Using diagnosis check wire)
(a)
Present troubles codes:
Output the DTC.
(1)
Turn the ignition switch to the ON position and wait
for approx. 20 seconds.
(2)
Using SST, connect terminals Tc and CG of the
DLC3.
SST
09843–18020
NOTICE:
Pay due attention to the terminal connecting position to
avoid a malfunction.
(b)
Past troubles codes:
Output the DTC.
(1)
Using service wire, connect terminals Tc and CG of
the DLC3.
SST
09843–18020
(2)
Turn the ignition switch to the ON position and wait
for approx. 20 seconds.
NOTICE:
Pay due attention to the terminal connecting position to
avoid a malfunction.
AT0716
AB0056
H08231
Normal Code
ON
OFF
0.25
0.25
Code 11 and 31
ON
OFF
0.5
2.5
4.0
1.5
0.5
DTC 11
DTC 31
Repeat
D09456
Hand–held Tester
DLC3
DI–306
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
LEXUS RX300 (RM785E)
(c)
Read the DTC.
Read the 2–digit DTC as indicated by the number of times
the SRS warning light blinks. As an example, the blinking
patterns, normal, 11 and 31 are shown in the illustration.
S
Normal code indication
The light will blink 2 times per second.
S
Malfunction code indication
The first blinking output indicates the first digit
of a 2–digit DTC. After a 1.5–second pause,
the second blinking output will indicate the
second digit.
If there are 2 or more codes, there will be a 2.5–second pause
between each code. After all the codes have been output, there
will be a 4.0–second pause and they will all be repeated.
HINT:
S
In the event of a number of trouble codes, indication will
start from the smallest numbered code.
S
If a DTC is not output or a DTC is output without terminal
connection, proceed to the Tc terminal circuit inspection
on page DI–439.
3.
DTC CHECK (Using hand–held tester)
(a)
Hook up the hand–held tester to the DLC3.
(b)
Read the DTCs by following the prompts on the tester
screen.
HINT:
Please refer to the hand–held tester operator’s manual for fur-
ther details.
4.
DTC CLEARANCE (Not using service wire)
When the ignition switch is turned off, the diagnostic trouble
code is cleared.
HINT:
DTC might not be cleared by turning the ignition switch OFF.
In this case, proceed to the next step.
5.
DTC CLEARANCE (Using service wire)
(a)
Connect the 2 service wires to terminals Tc and A/B of
DLC3.
(b)
Turn the ignition switch to ON and wait for approx. 6 se-
conds.
H10687
H05060
H16263
AB
Terminal
Tc
AB
OFF
Body
Ground
OFF
ON
OFF
Several
Seconds
50 m sec.
50 m sec.
1 second
(±0.5 sec.)
Tc
Body
Ground
1 second
(±0.5 sec.)
1
2
3
4
5
D09456
Hand–held Tester
DLC3
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–307
LEXUS RX300 (RM785E)
(c)
Starting with the Tc terminal, ground alternately terminal
Tc and terminal A/B twice each in cycles of 1.0 second.
Make sure that the terminals are grounded. Ensure the
terminal Tc remain grounded.
HINT:
When alternately grounding terminals Tc and AB, release
ground from one terminal and immediately ground the other ter-
minal within an interval of 0.2 seconds.
If DTCs are not cleared, repeat the above procedure until the
codes are cleared.
(d)
Several seconds after doing the clearing procedure, the
SRS warning light will blink in a 50 – m sec. cycle to indi-
cate the codes which have been cleared.
6.
DTC CLEARANCE (Using hand–held tester)
(a)
Hook up the hand–held tester to the DLC3.
(b)
Clear the DTCs by following the prompts on the tester
screen.
HINT:
Please refer to the hand–held tester operation’s manual for fur-
ther details.
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