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05-1919
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM 05BTJ-02
DTC B1271 COMBINATION METER ECU
COMMUNICATION STOP
CIRCUIT DESCRIPTION
DTC B1271 is output when communication between the combination meter and the body ECU stops for more
than 10 seconds.
DTC No. DTC Detection Condition Trouble Area
S Combination meter
B1271 Combination meter communication stops
S Wire harness
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2102
05-1920
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
WIRING DIAGRAM
Combination Meter
J19
Instrument Panel J/B Assy
J/C
24 7 12
W-L W-L 54 34 W-L
1C 1L C10 +B
A/C Amplifier (A/C ECU)
Engine Room J/B Assy 2 28
V 62 32 V
8 2C MPX+ A9 C10 MPX-
ECU-B Instrument Panel J/B Assy
Multiplex Network
2 Body ECU
21 29
R-L 13 33 R-L
1 Short Pin MPX2 B7 C10 MPX+
1 2D
W
30
1 F8 BR
C10 ES
FL Block
1 F6
W
FL
Main
Battery
IF
B67672
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2103
05-1921
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
INSPECTION PROCEDURE
1 CHECK RESISTANCE OF COMMUNICATION LINE
(a) Disconnect the C10 meter, A9 A/C ECU and B7 ECU con-
Wire Harness Side
nectors.
(b) Check the resistance between the wire harness side con-
nectors.
C10 Standard:
Combination Meter
Terminal No. Specified Condition
C10-28 (MPX-) - A9-2 (MPX+) Below 1
C10-29 (MPX+) - B7-21 (MPX2) Below 1
A9
A/C Amplifier Assy
(A/C ECU)
B7
Multiplex Network Body ECU
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
B68236
OK
2 CHECK COMBINATION METER ASSY (POWER SOURCE)
Wire Harness Side (a) Disconnect the C10 meter connector.
(b) Check the voltage between the wire harness side con-
C10 nector and body ground.
Combination Meter Standard:
Terminal No. Specified Condition
C10-12 (+B) - Body ground 10 to 14 V
B65849 NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2104
05-1922
DIAGNOSTICS - MULTIPLEX COMMUNICATION SYSTEM
3 CHECK COMBINATION METER ASSY (GROUND)
(a) Disconnect the C10 meter connector.
Wire Harness Side
(b) Check the resistance between the wire harness side con-
C10 nector and body ground.
Combination Meter Standard:
Terminal No. Specified Condition
C10-30 (ES) - Body ground Below 1
B65849 NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE COMBINATION METER ASSY
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2105
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