Lexus RX300 (MCU15). Service manual — part 373
DI–722
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
DTC
B1273 / 73
Sliding roof ECU communication stop
(w/ Sliding roof vehicle only)
CIRCUIT DESCRIPTION
This DTC is output when communication stops between sliding roof ECU and body ECU.
DTC No.
DTC Detecting Condition
Trouble Area
B1273/73
No communication from sliding roof ECU more than 10 se-
S Sliding roof ECU
B1273/73
No communication from sliding roof ECU more than 10 se
conds.
Sliding roof ECU
S Wireharness
WIRING DIAGRAM
See page DI–688.
INSPECTION PROCEDURE
1
Check sliding roof ECU.
CHECK:
Check that the operation of the sliding roof function is normal.
HINT:
With this inspection, the sliding roof ECU CPU can be diagnosed if it works normally or not.
NG
Replace the sliding roof ECU.
OK
DI2BG–06
I07402
Body ECU
Sliding Roof
MPX1
MPX1
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–723
LEXUS RX300 (RM785E)
2
Check wireharness
PREPARATION:
Disconnect connector sliding roof ECU and body ECU.
CHECK:
Check continuity between terminals MPX1 of body ECU and
MPX1 of sliding roof ECU.
OK:
There is a continuity in wireharness.
NG
Repair or replace wireharness.
OK
Replace the sliding roof ECU.
I19225
MPX–
MPX+
MPX–
MPX1
”I16”
”I17”
Theft Deterrent ECU
Center Cluster
”C11”
DI–724
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
LEXUS RX300 (RM785E)
DTC
B1276 / 76
A/C and combination meter integrated
ECU communication stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between A/C and combination meter integrated ECU and
Body ECU.
DTC No.
DTC Detecting Condition
Trouble Area
B1276/76
No communication from A/C and combination meter integrated
S A/C and combination meter integrated ECU
B1276/76
No communication from A/C and combination meter integrated
ECU more than 10 seconds.
A/C and combination meter integrated ECU
S Wireharness
WIRING DIAGRAM
See page DI–688
INSPECTION PROCEDURE
1
Check wireharness
PREPARATION:
Disconnect connector ”I16 (Except Europe)” or ”I17 (Europe)”
of center cluster integration panel ”T5” of theft deterrent ECU
and ”C11” of A/C and combination meter integrated ECU.
CHECK:
(a)
Check continuity between terminals MPX– of center clus-
ter integration panel and MPX+ of A/C and combination
meter integrated ECU.
(b)
Check continuity between terminals MPX– of A/C and
combination meter integrated ECU and MPX1 of theft de-
terrent ECU.
OK:
There is a continuity in wireharness of both (a) and (b), 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 A/C and combination meter inte-
grated ECU.
DI2BC–07
I19226
MPX–
MPX+
MPX–
MPX2
”B8”
”C11”
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–725
LEXUS RX300 (RM785E)
DTC
B1277 / 77
Center cluster integration panel com-
munication stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between center cluster integration panel and Body ECU.
DTC No.
DTC Detecting Condition
Trouble Area
B1277/77
No communication from center cluster integration panel more
S Center cluster integration panel
B1277/77
No communication from center cluster integration anel more
than 10 seconds.
Center cluster integration anel
S Wireharness
WIRING DIAGRAM
See page DI–688
INSPECTION PROCEDURE
1
Check wireharness
PREPARATION:
Disconnect connector ”B8” of body ECU ”I16” or ”I17” of center
cluster integration panel and ”C11” of A/C and combination me-
ter integrated ECU.
CHECK:
(a)
Check continuity between terminals MPX2 of body ECU
and MPX+ of A/C and combination meter integrated ECU.
(b)
Check continuity between terminals MPX2 of body ECU
and MPX– of center cluster integration panel.
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 A/C ECU.
DI2BC–08
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