Lexus RX300 (MCU15). Manual — part 348
DI2EW–03
DI–624
–
DIAGNOSTICS
PASSENGER DOOR CONTROL SYSTEM
LEXUS RX300 (RM785E)
PROBLEM SYMPTOMS TABLE
POWER WINDOW CONTROL SYSTEM
Symptom
Suspect Area
See page
Power window does not operate.
1. Passenger door ECU with power window switch
–
Auto up (or down) function does not operate.
1. Passenger door ECU with power window switch
–
Jam protection function and auto up (or down) function does not
operate.
1. Jam protection limit switch circuit
2. Jam protection pulse switch circuit
3. Passenger door ECU with power window switch
DI–638
DI–640
–
OTHERS
Symptom
Suspect Area
See page
Parts of the door does not function.
1. Power source circuit
2. Passenger door ECU
DI–625
DI2EX–09
I19266
Passenger Door
ECU
SIG
18
5
W–R
BDR
CPUB
GND
5
Short Pin
C
ECU–B
14
25
IL1
L–B (*2)
1
Ignition
SW
3
ALT
9
IC2
F17
W–B
J20
J/C
IG1
F17
9
F17
W–L
1D
Instrument Panel J/B
F17
3
F11 FL Block
W
L–B (*2)
C
L–B (*2)
(*1)
IC1
9
(*2)
L–B (*1)
IL1
1
1D
10
R–L
IL1
4
(*1)
IC1
4
(*2)
R–L
W–L
1D
2
GAUGE
B–Y
IG (*1)
IE (*2)
P FR DOOR
1C
7
4
AM1
2
W–L
1C
6
2
1
1A
1
1D
12
IC1
IL1
12
12
(*2)
(*1)
W–B
J5
J9
A
A
(*2)
(*1)
*1: LHD
*2: RHD
FL DOOR
L–B
(*2)
Battery
W
W–R
Engine Room J/B
2I
1
2A
4
2A
2
L–B (*1)
AM1
J/C
–
DIAGNOSTICS
PASSENGER DOOR CONTROL SYSTEM
DI–625
LEXUS RX300 (RM785E)
CIRCUIT INSPECTION
Power source circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the passenger door ECU.
WIRING DIAGRAM
DI–626
–
DIAGNOSTICS
PASSENGER DOOR CONTROL SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check ECU–B, GAUGE and P FR DOOR fuse.
CHECK:
Check continuity of ECU–B,GAUGE and P FR DOOR fuse.
OK:
Continuity
NG
Replace the failure fuse.
OK
2
Check voltage between terminals BDR,CPUB, SIG and GND of passenger door
ECU connector.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals SIG, and GND.
OK:
Voltage: 10 – 14V
PREPARATION:
(a)
Turn ignition switch OFF.
(b)
Disconnect the passenger door ECU connector.
CHECK:
Measure voltage between terminals BDR, CPUB and GND.
OK:
Voltage: 10 – 14V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–624).
NG
–
DIAGNOSTICS
PASSENGER DOOR CONTROL SYSTEM
DI–627
LEXUS RX300 (RM785E)
3
Check wireharness and connector between ECU and body ground.
NG
Repair or replace wireharness or connector.
OK
Check and repair wireharness and connector
between ECU and battery.
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