Lexus RX300 (MCU15). Service manual — part 142

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BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

BE–115

LEXUS RX300 (RM785E)

Yes

+B power source check:

Check that there is constantly 10 to 14 V voltage at the
connector terminal + B of wireless door control receiv-
er.

No

Wire harness faulty.
Body ground open and contact error.

Yes

Body ground check:

Check that continuity exists between the connector
terminal 1 (GND) of the wireless door control receiver
and body ground.

No

Wireless door control receiver faulty.

DOME fuse or wire harness faulty.

BE1YK–01

I04149

BE–116

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BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

LEXUS RX300 (RM785E)

INSPECTION

1.

INSPECT WIRELESS DOOR LOCK TRANSMITTER
OPERATION

HINT:
Refer to ”Wireless door lock control transmitter battery replace-
ment” on page BE–120.
(a)

Using a screwdriver, remove the screws and cover.

(b)

Remove the battery (lithium battery).

(c)

Install a new or normal battery (lithium battery).

HINT:
When a new or normal battery can not be obtained, connect 2
new 1.5 V batteries in series, connect the battery (+) to the bat-
tery receptacle side terminal and battery (–) to the bottom termi-
nal, then apply 3 V voltage to the transmitter.
(d)

In the location where is approx. 1 M away from driver’s
outside handle in the right direction, face the key plate of
the transmitter to the vehicle, and check the transmitter
operation when pressing transmission switch on the side
of the transmitter body.

Standard:

S

Remote control of vehicle door lock can be operated.

S

LED lights up more than once.

HINT:

S

The minimum operation distance differs according to op-
erator, the way of holding the transmitter, and location.

S

As weak wave is used, operation distance might be short-
ened when noise is detected in strong wave or used fre-
quency.

(e)

Install the battery (lithium battery).

(f)

Install a cover so that O–ring is not distorted or slipped off.

(g)

Using a screwdriver, tighten the screws.

I04150

I19117

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BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

BE–117

LEXUS RX300 (RM785E)

2.

CHECK BATTERY CAPACITY

HINT:

S

Make sure to use the TOYOTA electrical tester.

S

With the battery unloaded, judge can not be made wheth-
er the battery is available or not on the test.

S

When the transmitter is faulty, the energy amount left in
the battery might not be checked correctly.

S

On the lithium battery used for the transmitter, the voltage
more than 2.5 V with the battery unloaded is shown on the
tester until the energy is completely consumed.
Accordingly when inspecting the energy amount left in the
battery, it is necessary to measure the voltage when the
battery is loaded. (1.2 kΩ).

(a)

Remove the screws and cover using a (–) driver.

(b)

Remove the battery (lithium battery) from the transmitter.

(c)

Connect the lead to the (–) terminal of the transmitter and
install the battery.

(d)

Connect the (+) tester to the (+) battery (lithium battery),
and (–) tester to the lead respectively.

(e)

Press one of the transmitting switches on the transmitter
for approx. 1 second.

(f)

Press the transmitting switch on the transmitter again to
check the voltage.
Standard: 2.1 V or more

I12038

Wire Harness Side

BE–118

–

BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

LEXUS RX300 (RM785E)

HINT:

S

When the temperature of the battery is low, the judge can
not be made correctly.
When the outcome of the test is less than 2.1 V, conduct
the test again after leaving the battery in the place at 18
°C for more than 30 minutes.

S

By auto power off function, the voltage becomes no load
voltage (more than 2.5 V) condition 0.8 seconds after the
switch was pressed.
Make sure to read the voltage before of it.

S

High voltage might be shown 1 to 2 times after leaving the
battery, judge should be made with the voltage shown at
the 3rd time or later.

(g)

Disconnect the lead.

(h)

Set the battery (lithium battery) in the transmitter.

(i)

Install the cover, so that the O–ring is not distorted or
slipped off.

(j)

Using a screwdriver, tighten the screws.

3.

INSPECT WIRELESS DOOR LOCK CONTROL RE-
CEIVER CIRCUIT (See page DI–584)

Disconnect the connector from the receiver and inspect the
connector on the wire harness side, as shown.

Tester connection

Condition

Specified condition

1 – Ground

Constant

Continuity

5 – Ground

Constant

Battery voltage

If the circuit is not as specified, inspect the circuits connected
to other parts.