Lexus RX300 (MCU15). Service 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.