Lexus RX300 (MCU15). Service manual — part 370
DI–710
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
DTC
B1231 / 31
Jam protection limit switch circuit on
driver door
DTC
B1233 / 33
Jam protection limit switch circuit on
passenger door
DTC
B1235 / 35
Jam protection limit switch circuit on
rear right door
DTC
B1237 / 37
Jam protection limit switch circuit on
rear left door
CIRCUIT DESCRIPTION
These DTCs are output when a malfunction of limit switch within power wIndow motor is detected.
DTC No.
DTC Detection Condition
Trouble Area
B1231/31
B1233/33
No change in limit switch more than 2.0 seconds even if oper-
ti
l
d
h
li it
it h i OFF
S Jam protection limit switch
B1235/35
ating glass down when limit switch is OFF
(window glass is fully closed)
Jam rotection limit switch
S Wireharness
B1237/37
(window glass is fully closed)
HINT:
Please refer to power window control system of BE section for switch inspection, and to each door system
of DI section for wireharness inspection.
DI1SQ–02
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–711
LEXUS RX300 (RM785E)
DTC
B1232 / 32
Jam protection pulse switch circuit on
driver door
DTC
B1234 / 34
Jam protection pulse switch circuit on
passenger door
DTC
B1236 / 36
Jam protection pulse switch circuit on
rear right door
DTC
B1238 / 38
Jam protection pulse switch circuit on
rear left door
CIRCUIT DESCRIPTION
These DTCs are output when a malfunction of pulse switch within power window motor is detected.
DTC No.
DTC Detecting Condition
Trouble Area
B1232/32
B1234/34
No change in pulse switch more than 2.0 seconds even if
i
l
d
h
li it
it h i OFF
S Jam protection pulse switch
B1236/36
opening glass down when limit switch is OFF
(window glass is fully closed)
Jam rotection ulse switch
S Wireharness
B1238/38
(window glass is fully closed).
HINT:
Please refer to power window control system of BE section for switch inspection, and to each door system
of DI section for wireharness inspection.
DI1SR–02
I12721
Body ECU
Wireless Door Lock Tuner
2
PRG
RDA
16
17
LG
LG
L
L
18
IA2
IA2
17
3
B6
B6
PRG
RDA
DI–712
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
DTC
B1242 / 42
Wireless door lock tuner circuit mal-
function
CIRCUIT DESCRIPTION
This DTC is output when GND short of RDA terminal is detected.
DTC No.
DTC Detecting Condition
Trouble Area
B1242/42
GND short of RDA terminal
S Wireharness
S Wireless door lock tuner
S Body ECU
WIRING DIAGRAM
DI2B7–09
I03347
Tuner
Body No.1
ECU
RDA
I03348
Tuner
Body No.1
ECU
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–713
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check wireharness.
PREPARATION:
Disconnect the connector of tuner and body ECU.
CHECK:
Check the continuity between wireharness and body ground.
OK:
No continuity.
NG
Repair or replace the wireharness.
OK
2
Check body ECU.
PREPARATION:
Connect the connector of body ECU.
CHECK:
Check the DTC.
OK:
B1242/42 is not output.
NG
Replace the body ECU.
OK
Replace the tuner.
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