Lexus RX300 (MCU15). Service manual — part 76

B11114

Example:

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INTRODUCTION

FOR ALL OF VEHICLES

IN–15

LEXUS RX300 (RM785E)

(g)

SEAT BELT PRETENSIONER
(1)

Never measure the resistance of the seat belt pre-
tensioner. (This may cause the seat belt pretension-
er activation which is very dangerous.)

(2)

Never disassemble the seat belt pretensioner.

(3)

Never install the seat belt pretensioner in another
vehicle.

(4)

Store the seat belt pretensioner where the ambient
temperature remains below 80°C (176°F) and
away from electrical noise without high humidity.

(5)

When using electric welding, first disconnect the
connector (yellow color and 2 pins) before starting
work.

(6)

When disposing of a vehicle or the seat belt preten-
sioner alone, the seat belt pretensioner should be
activated before disposal (See page BO–191). Per-
form the operation in a safe place away from electri-
cal noise.

(7)

The seat belt pretensioner is hot after activation, so
let it cool down sufficiently before the disposal.
However never apply water to the seat belt preten-
sioner.

IN–16

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INTRODUCTION

FOR ALL OF VEHICLES

LEXUS RX300 (RM785E)

(h)

AIRBAG SENSOR ASSEMBLY
(1)

Never reuse the airbag sensor assembly involved
in a collision when the SRS has deployed.

(2)

The connectors to the airbag sensor assembly
should be connected or disconnected with the sen-
sor mounted on the floor. If the connectors are con-
nected or disconnected while the airbag sensor as-
sembly is not mounted to the floor, it could cause
undesired ignition of the supplemental restraint sys-
tem.

(3)

Work must be started after 90 seconds from the
time the ignition switch is turned to the ”LOCK” posi-
tion and the negative (–) terminal cable is discon-
nected from the battery, even if only loosing the set
bolts of the airbag sensor assembly.

(i)

WIRE HARNESS AND CONNECTOR
The SRS wire harness is integrated with the cowl wire har-
ness assembly and floor wire harness assembly. The
wires for the SRS wire harness are encased in a yellow
corrugated tube. All the connectors for the system are
also a standard yellow color. If the SRS wire harness be-
comes disconnected or the connector becomes broken
due to an accident, etc., repair or replace it as shown on
page RS–66.

B04707

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INTRODUCTION

FOR ALL OF VEHICLES

IN–17

LEXUS RX300 (RM785E)

2.

WHEN SERVICING FULL–TIME 4WD VEHICLES

The center differential of the Full–time 4WD RX300 is equipped
with the viscous coupling type LSD.
If incorrect preparations or test procedures are used, the test
will not only be unsuccessful, but may be dangerous as well.
Therefore, before beginning any such servicing or test, be sure
to check the following items:

S

Whether wheels should be touching ground or jacked up

S

Transaxle gear position

S

Maximum testing vehicle speed

S

Maximum testing time

CAUTION:

S

Never accelerate or decelerate the vehicle suddenly

S

Observe the other cautions given for each individual
test

(a)

Before Beginning Test
This vehicle does not have a Center Diff. Lock Mode or
4WD (Normal) Mode to allow only the front or rear wheel
to be rotated.
The test method for this vehicle is different from that for
vehicles equipped with the Center Diff. Lock Mode or
4WD (Normal) Mode, so make sure to use the correct test
method.

(b)

Braking Force Test
(Vehicle Speed: Below 0.5 km/h or 0.3 mph)
When performing low–speed type brake tester measure-
ments, observe the following instructions.
(1)

Position the wheels to be tested (front or rear) on
the tester.

(2)

Shift the transaxle shift lever to ”N” position.

(3)

Idle the engine, operate the brake booster and per-
form the test.

B13135

No.

Chassis Dynamometer Type

Vehicle Condition

Vehicle Speed and Test Time

2–Wheel Chassis Dynamometer

1.

2.

3.

No restriction on vehicle speed or duration
of test

*
Low speed (50 km/h or less) and 1 minute
or less

*
Low speed (50 km/h or less) and 1 minute
or less

4–Wheel Free Chassis Dynamometer

4–Wheel Driven Chassis Dynamometer

B04709

IN–18

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INTRODUCTION

FOR ALL OF VEHICLES

LEXUS RX300 (RM785E)

(c)

Speedometer Test or Other Tests
(Using Speedometer Tester or Chassis Dynamometer)
When performing test at high speed or high load, use the methods shown below.

*: This is to avoid damaging the center viscous coupling.
NOTICE:

S

Confirm that the vehicle is securely immobilized.

S

Never operate the brakes to drive the wheels or stop them suddenly.

(d)

On–Vehicle Wheel Balancing
When doing on–vehicle wheel balancing on a Full–time
4WD vehicle, to prevent the wheels from rotating at differ-
ent speeds in different directions from each other (which
could damage the center differential), always be sure to
observe the following precautions:

(1)

All 4 wheels should be jacked up, clearing the
ground completely.

(2)

The parking brake lever should be fully released.

(3)

None of the brakes should be allowed to drag.

(4)

The wheels should be driven on the wheel balancer
with the engine running.

HINT:
When doing this, be careful of the other wheels, which will rotate
at the same time.

(5)

Avoid sudden acceleration, deceleration and brak-
ing.

(6)

Carry out the wheel balancing with the transaxle in
D position.