Lexus RX300 (MCU15). Manual — part 365
I19183
MPX2
MPX1
MPX2
MPX1
Driver Door
Theft Deterrent
”T5”
DI–690
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check driver door ECU.
CHECK:
Check if the driver door window glass auto up.
HINT:
With this inspection, the driver door ECU CPU can be diagnosed if it works normally or not.
NG
Replace the driver ECU.
OK
2
Check wireharness.
PREPARATION:
Disconnect connector of ”T5” of theft deterrent ECU and driver
door ECU and ”R11” of rear left door ECU.
CHECK:
(a)
Check continuity between terminals MPX2 of theft deter-
rent ECU and MPX1 of driver door ECU.
(b)
Check continuity between terminals MPX2 of driver door
ECU and MPX1 of rear left door ECU.
OK:
There is a continuity in wireharness of both (a) and (b). or either
(a) or (b).
HINT:
If there is OPEN in wireharness of either (a) or (b), please repair
it.
NG
Repair or replace wireharness.
OK
Replace the driver door ECU.
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–691
LEXUS RX300 (RM785E)
DTC
B1212 / 12
Front passenger door ECU commu-
nication stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between front passenger door ECU and body ECU.
DTC No.
DTC Detecting Condition
Trouble Area
B1212/12
No communication from front passenger door ECU more than
S Front passenger door ECU
B1212/12
No communication from front assenger door ECU more than
10 seconds.
Front assenger door ECU
S Wireharness
WIRING DIAGRAM
See page DI–688
INSPECTION PROCEDURE
1
Check front passenger door ECU.
CHECK:
Check if the front passenger door window glass auto up.
HINT:
With this inspection, the front passenger door ECU CPU can be diagnosed if it works normally or not.
NG
Replace the front passenger door ECU.
OK
DI2B0–09
I07386
MPX2
MPX2
MPX1
MPX1
E8
DI–692
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
2
Check wireharness
PREPARATION:
Disconnect connector ”E8” of engine & ECT ECU and ”R13” of
rear right door ECU.
CHECK:
(a)
Check continuity between terminals MPX1 of engine &
ECT ECU and MPX2 of passenger door ECU.
(b)
Check continuity between terminals MPX1 of passenger
door ECU and MPX2 of rear right door ECU.
OK:
There is a continuity in wireharness of both (a) and (b) or (a) or
either (a) or (b).
HINT:
If there is OPEN in wireharness of either (a) or (b), please repair
it.
NG
Repair or replace wireharness.
OK
Replace the passenger door ECU.
I19212
Body ECU
Driver Door
ECU
Sliding Roof
ECU
Engine & ECT ECU
Passenger Door
Door
Rear Right Door
ECU
Center Cluster
Integration Panel
Rear Left
Door ECU
A/C and Combination
Meter Integrated
ECU
Theft Deterrent
ECU
Double Lock
Control Relay
+B Short
GND Short
Example:
Example:
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–693
LEXUS RX300 (RM785E)
DTC
B1214 / 14
System communication bus malfunc-
tion (+B short)
DTC
B1215 / 15
System communication bus malfunc-
tion (GND short)
CIRCUIT DESCRIPTION
This DTC is output when +B or GND short occurs on door system communication bus. If +B or GND short
is detected on door system communication bus, separate it by bus cut relay in body ECU to prevent while
communication buses’ failure.
WIRING DIAGRAM
See page DI–688.
DI84Z–01
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