Lexus RX300 (MCU15). Manual — part 369
DI–706
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DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
DTC
B1217 / 17
Rear left door ECU communication
stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between rear left door ECU and body ECU.
DTC No.
DTC Detecting Condition
Trouble Area
B1217/17
No communication from rear left door ECU more than 10 se-
S Rear left door ECU
B1217/17
No communication from rear left door ECU more than 10 se
conds.
Rear left door ECU
S Wireharness
WIRING DIAGRAM
See page DI–688
INSPECTION PROCEDURE
1
Check rear left door ECU.
CHECK:
Check if the rear left door window glass auto up.
HINT:
With this inspection rear left door ECU CPU can be diagnosed if it works normal or not.
NG
Replace the rear left door ECU.
OK
DI2B4–07
I19224
”R13”
Rear Left Door
Rear Left Door
Double Lock
Control Relay
Driver Door
”R13”
MPX2
MPX1
MPX2
MPX1
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DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–707
LEXUS RX300 (RM785E)
2
Check wireharness
PREPARATION:
Disconnect connector of driver door ECU, ”R13” of rear left door
ECU and double lock control relay.
CHECK:
(a)
Check continuity between terminals MPX2 of driver door
ECU and MPX1 of rear left door ECU.
(b)
Check continuity between terminals MPX2 of rear left
door ECU and MPX1 of double lock control relay.
OK:
There is a continuity in wireharness of both (a) and (b) or (a) and
(c), (a) or either (b) or (c).
HINT:
If there is OPEN in wireharness of either (a), (b) or (c), please
repair it.
NG
Repair or replace wireharness.
OK
Replace the rear left door ECU.
DI–708
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DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
DTC
B1221 / 21
Power window switch circuit on driver
door
DTC
B1222 / 22
Door lock switch circuit on driver door
DTC
B1223 / 23
Power window switch circuit on pas-
senger door
DTC
B1224 / 24
Door lock switch circuit on passenger
door
DTC
B1225 / 25
Power window switch circuit on rear
right door
DTC
B1226 / 26
Power window switch circuit on rear
left door
DTC
B1241 / 41
Body ECU switch circuit diagnosis
DTC
B1256 / 56
Center cluster integration panel switch
circuit diagnosis
CIRCUIT DESCRIPTION
These DTC notify how switch works as follows:
If DTC is not output when operating switch, it means failure of switch contact. If DTC is output when not oper-
ating switch, it means stick of switch. When something wrong is found by this diagnosis, inspect each switch.
Then, replace the switch if there is a problem, or check the wireharness if there is no problem.
DTC No.
DTC Detecting Condition
Trouble Area
B1221/21
Stick of either of the power window master switch
(except window lock switch)
S Power window master switch
S Wireharness
B1222/22
Stick of door key lock and unlock switch
S Door lock control switch
S Door key lock and unlock switch
S Wireharness
DI2B6–09
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DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–709
LEXUS RX300 (RM785E)
B1223/23
Stick of passenger power window switch or door lock control
S Power window switch
S Door lock control switch
S Wireharness
B1224/24
Stick of door key lock and unlock switch
S Door lock control switch
S Door key lock and unlock switch
S Wireharness
B1225/25
Stick of rear right power window switch
S Power window switch
S Wireharness
B1226/26
Stick of rear left power window switch
S Power window switch
S Wireharness
B1241/41
Stick of switch
S Driver’s seat belt buckle switch
S Light control switch
S Stop light switch
S Wireharness
B1256/56
Stick of switch
S Multi function switch
S Power switch
S Sound mode switch
S Clock switch
S CD switch
S TAPE switch
S FM1/2 switch
S AM switch
S INFO switch
S BRIGHTNESS switch
S TUNE SEEK TRAC switch
S Eject switch
S MUTE switch
S MODE switch
S A/C switch
S R/F switch
S REAR defogger switch
S FRONT defroster switch
S OFF switch
S AUTO switch
S Wireharness
HINT:
Please refer to BE section for switch inspection, and to each door system of DI section for wireharness in-
spection.
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