2000 LEXUS GS400 ECU

± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
BE±155
2456 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
Transmitter faulty or wireless door lock receiver
faulty.

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.)
NoOther body control system faylty.
(Transmitter and receiver are normal.)
Ye s
No
Wireless door control receiver check:
Check the diagnosis. (wirelss door lock signal error)
(Refer to ºMultiplex communication systemº)
Check that diagnostic code 42 is output.
Ye s
Wire harness faulty (short circuit)
Between the receiver terminal 4 (RDA) and
body ECU terminal B14 (RDA).Ye s
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.
Ye s
Using SST, connect terminal Tc and E1 of DLC1.

BE±156
± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
2457 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
Ye s
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.
Ye s
+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.
Ye s
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).

I04026

Engine Room No.1 Junction Block
Fuses Relays
1. MAIN H±Fuse
2. FL ABS NO.1 H±Fuse
3. ALT H±Fuse
4. ABS NO.2 H±Fuse
5. H±LP CLN H±Fuse
6. RAD NO.1 Fuse
7. ALT±S Fuse
8. EFI Fuse
9. TURN HAZ Fuse
10. TEL Fuse
11. AM2 Fuse
13. HORN Fuse 12. ETCS Fuse
14. MPX±B Fuse
15. ECU±B1 Fuse
16. HTR FuseB. Starter Relay A. Headlight Control Relay
C. EFI Relay
17. FAN MAIN H±Fuse
18. CDS FAN H±Fuse
20. H±LP R LWR Fuse 19. RAD FAN H±Fuse
21. H±LP L LWR Fuse
22. H±LP R UPR Fuse
23. H±LP L UPR Fuse1
2 3 4 5 6 7 8 9 10 11 12 13
14 15
16 18 17 19
20 21 22 23 A
BC
± BODY ELECTRICALPOWER SOURCE
BE±17
2318 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

I04029
Fuses
Relays 1. AM1 H±Fuse
2. WASHER Fuse
3. FOG Fuse
4. TAIL Fuse
B. Taillight Control Relay A. Fog Light Relay
C. Body ECU No.2
Driver Side Instrument Panel Junction Block
5. SRS±ACC Fuse
6. GAUGE Fuse
7. FUEL OPN Fuse
8. D FR DOOR Fuse
9. PANEL Fuse
10. HTR Fuse
11. SRS±B Fuse
12. P/SEAT (D) Fuse
13. RAD NO.2 Fuse
14. WIP Fuse
15. OBD Fuse
16. STOP Fuse
17. CIG Fuse
18. ECU±IG Fuse
19. STARTER Fuse
20. IGN Fuse
21. D FR DOOR Fuse
2
21 34 5
678 9
10 11 12 13
14 15 16 17
18 19 20AB
C 1
± BODY ELECTRICALPOWER SOURCE
BE±19
2320 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

I04030
Fuses
Relays 1. DEF H±Fuse
2. ±
3. ±
4. MIR HTR Fuse
A. Ignition Main Relay
B. Mirror Heater Relay
E. Body ECU No.1
Passenger Side Instrument Panel Junction Block
5. ±
6. ±
7. S/ROOF Fuse
8. P FR DOOR Fuse
9. ±
10. ±
11 .
12. P/SEAT (P) Fuse
13. DOME Fuse
14. SEAT HTR Fuse
15. ±
16. TV Fuse
17. ECU±B2 Fuse
18. ±
19. ±
20. ±
21. P FR DOOR Fuse
2
21 34 5
67 8 9
10 11 12 13
14 15 16 17
18 19 20AB
E
C. Defogger Relay
D. Heater Relay
CD
1
BE±20
± BODY ELECTRICALPOWER SOURCE
2321 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

BE±164
± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
2465 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
Within
3 secs.
Turn the ignition switch from ON to LOCK at approx. 1 sec. interval 1 to 5 times to select the mode.
Pull out the key plate from the ignition key cylinder.
When add mode or rewrite mode
is selected.When confirmation
mode is selected.
ON
ONON
LOCK
LOCKLOCK
Approx.
1 sec.Approx.
1 sec. Approx. 1 sec.Approx.
1 sec.Approx.
1 sec.
Add mode
Rewrite modeConfirmation mode
ON ± LOCK change occurs 1 time
ON ± LOCK change occurs 2 timesON ± LOCK change occurs 3 times
MPX body ECU automatically performs
the LOCK±UNLOCK operation once
or twice at 1 sec. interval to iniform the
operator that either the add mode or
rewrite mode has been selected.
LOCK±UNLOCK occurs once
LOCK±UNLOCK occurs twice
Indicates that add mode has been selected.
Indicates that rewrite mode has been
selected.
1 sec.
LOCK
1 sec.1 sec.
LOCK
UNLOCK
UNLOCK
LOCK
2 secs.2 secs.
UNLOCK MPX body ECU automatically performs the
LOCK±UNLOCK operation 1 to 4 times at
2 sec. interval to inform the operator of
the number of the registered codes.
HINT:
When the number of the registered code
is 0, the operation is automatically
performed 5 times.
Example:
When the operation is performed twice, it
directs that 2 types of recognition code
have been registered.
1st time 2nd time
Registration of recognition code (Confirmation
mode and prohibition mode) is completed.
ON
LOCK
Approx.
1 sec.Approx.
1 sec.
Prohibition mode
ON ± LOCK change occurs 5 times
When prohibition
mode is selected.

± BODY ELECTRICALWIRELESS DOOR LOCK CONTROL SYSTEM
BE±165
2466 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
MPX body performs LOCK±UNLOCK operation 5 times at a 1 sec.
interval to inform the operator that prohibition mode has been selected.
Press again either one of 3 switches on the transmitter for more than 1 sec.
MPX body ECU automatically performs LOCK±UNLOCK operation once or
twice at a 1 sec. interval to inform the operator that the receiver has received the
signal from the transmitter.
LOCK±UNLOCK occurs once
LOCK±UNLOCK occurs twice Registration of recognition code is completed
Registration of recognition code has not been completed.

Recognition code received first time and second time did not match.
Proceed to continue registration
If even one of the following conditions is satisfied, registration of recognition
codes is completed.

40 secs. elapses since the MPX body ECU response.

The driver's door is closed.

The key plate is inserted in the ignition key cylinder.

4 type recognition codes are registration at one time.
Registration of recognition codes (add mode or rewrite mode) is completed.
Within
3 secs.Within
40 secs.
ON
LOCK
Approx.
1 sec.Approx.
1 sec.
When prohibition
mode is selected.
Press the lock and unlock switches on the transmitter simultaneously within 1 sec.
If LOCK±UNLOCK operation can not be performed at all, the mode returns to the
normal mode, then start with ºStart registration of recognition codeº.
Proceed to finish registration
Within 40 secs.

BE02J±10
I01368
Mirror Assembly

Mirror Motor
Mirror Switch

Left/Right Adjustment Switch

Mirror Control SwitchIgnition Switch
Driver Side Junction Block

Body ECU No.2
± BODY ELECTRICALPOWER MIRROR CONTROL SYSTEM
BE±175
2476 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
POWER MIRROR CONTROL SYSTEM
LOCATION