Toyota Sequoia (2005). Manual — part 537
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–1943
2137
DTC
B1271
Combination meter ECU communica-
tion stop
CIRCUIT DESCRIPTION
This DTC is indicated when communication fails between the combination meter and body ECU.
DTC No.
DTC Detecting Condition
Trouble Area
B1271
No communication from combination meter for more than 10
seconds.
Combination meter
Wire harness
Body ECU
DIDFJ–01
I28470
Back Door ECU
Combination Meter
I19
A/C ECU
(Integration Control and Panel)
Instrument Panel J/B
I18
Ignition SW
Engine Room J/B
Instrument Panel J/B
J8
J/C
F10
Fusible
Link Block
Battery
IE
C6
B11
BF1
BD2
J34
J33
C5
C5
C6
1J
1C
1D
1H
1J
1C
2C
2D
2C
1D
1F
C6
Short Pin ECU–B
AM2
IGN1
IG2
AM2
MPX1
MPX–
LG–B
LG–R
LG–R
LG–R
LG–B
W–R
B–O
W–R
B–R
W–R
W–R
W–R
W–R
W–B
BR
B
B
A
B
H
2
31
32
23
24
6
7
13
3
2
9
11
5
6
3
7
1
8
1
9
6
12
5
4
J/C
DI–1944
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
2138
WIRING DIAGRAM
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–1945
2139
INSPECTION PROCEDURE
1
Check combination meter.
CHECK:
Start the engine and check that the speed meter and tachometer operate normally.
HINT:
With this inspection, the combination meter CPU can be diagnosed if it works normally or not.
OK:
Speed meter and tachometer operate normally.
NG
Go to combination system (See page
OK
2
Check wire harness and connector (Combination meter – back door ECU, com-
bination meter – integration control and panel).
PREPARATION:
Disconnect connector ”B11” of the back door ECU, connector ”C5” of the combination meter and connector
”I19” of the integration control and panel.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Tester connection (Symbols)
Condition
Specified condition
B11–2 (MPX1) – C5–31
Always
Below 1
Ω
I19–13 (MPX–) – C5–32
Always
Below 1
Ω
B11–2 (MPX1) – Body ground
Always
10 k
Ω
or higher
I19–13 (MPX–) – Body ground
Always
10 k
Ω
or higher
NG
Repair or replace wire harness.
OK
Replace the combination meter.
If the problem recurs even after replacement, replace the body ECU.
DI–1946
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
2140
DTC
B1272
Memory seat ECU communication stop (w/
Driving position memory)
CIRCUIT DESCRIPTION
This DTC is indicated when communication fails between the memory seat ECU & switch and body ECU.
DTC No.
DTC Detecting Condition
Trouble Area
B1272
No communication from memory seat ECU & switch for more
than 10 seconds.
Memory seat ECU & switch
Wire harness
Body ECU
DIDFK–01
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