Lexus GS300/400 (2000 year). Manual — part 48

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BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

BE–155

2456

Transmitter faulty or wireless door lock receiver
faulty.
<Reference>
Check the wave reaching range with another
transmitter (normal). When the range is normal,
transmitter defection is detected, the range is
not normal, wireless door lock receiver defection
is detected.

The wave reaching range check:

Is the wave reaching range normal?
(1 M area around vehicle)
(While the transmitting switch is pressed,
(approx. 20 secs.) the buzzer chirps continuously.
After 20 secs., repress the switch again.)

No

Other body control system faylty.
(Transmitter and receiver are normal.)

Yes

No

Wireless door control receiver check:

Check the diagnosis. (wirelss door lock signal error)
(Refer to ”Multiplex communication system”)

Check that diagnostic code 42 is output.

Yes

Wire harness faulty (short circuit)
Between the receiver terminal 4 (RDA) and
body ECU terminal B14 (RDA).

Yes

RDA terminal open circuit.

No

Check RDA terminal circuit.

Check that the voltage of RDA is 10 to 14 V
(without transmitting).

No

When pressing each switch of
the new or normal transmitter
used in the same type vehicle,
check that all buzzers chirp
in the same way.

Transmitter faulty.

Yes

Using SST, connect terminal Tc and E1 of DLC1.

BE–156

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BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

2457

Yes

Wireless door control receiver power source check:

Check that there is 4.5 – 5.5 V voltage at the
connector terminal 3 (RCO) of wireless door control
receiver under the vehicle initialized condition.
(1) Check that the control receiver voltage becomes
0 V during transmitting.
(2) When RCO is turned ON compulsoring with a
LEXUS hand–held tester, check that the wireless door
lock control receiver voltage becomes 0 V.

No

ECU–B1 and MPX–B, or P FR DOOR fuse
or wire harness faulty.

Yes

+B power source check:

Check that there is constantly10 to 14 V voltage at the
connector terminal 1 (+B) of wireless door control
receiver.

No

Wire harness faulty.
Body ground open and contact error.

Yes

Body ground check:

Check that continuity exists between the connector
terminal 7 (GND) of the wireless door control receiver
and body ground.

No

Wireless door control receiver faulty.

Wire harness faulty (open circuit)
Between the receiver terminal 3 (CONT) and
body ECU terminal B5 (RCO).

BE0GO–04

I04149

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BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

BE–157

2458

INSPECTION

1.

INSPECT WIRELESS DOOR LOCK TRANSMITTER
OPERATION

HINT:
Refer to ”Wireless door lock control transmitter battery replace-
ment” on page

BE–161

.

(a)

Using a screwdriver, remove the screw 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:

Remote control of vehicle door lock can be operated.

LED lights up more than once.

HINT:

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

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 screw.

I04150

I04151

BE–158

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BODY ELECTRICAL

WIRELESS DOOR LOCK CONTROL SYSTEM

2459

2.

CHECK BATTERY CAPACITY

HINT:

Make sure to use the TOYOTA electrical tester.

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

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

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 k

Ω

).

(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