2001 TOYOTA SEQUOIA roof

DI±1906
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2100 Author: Date:
2005 SEQUOIA (RM1146U)B1242
(DI±1933)
Wireless door lock tuner circuit malfunction

Wireless door lock control receiver

Wire harness

Body ECU
B1243
(DI±1935)GSW terminal circuit malfunction

Airbag sensor assembly

Wire harness

Body ECU
B1244
(DI±1937)Light sensor circuit malfunction

Automatic light control sensor

Wire harness

Body ECU
B1262
(DI±1940)A/C ECU communication stop

A/C ECU (Integration control and panel)

Wire harness

Body ECU
B1271
(DI±1943)Combination meter ECU communication stop

Combination meter

Wire harness

Body ECU
B1272
(DI±1946)Memory seat ECU communication stop
(w/ Driving position memory)
Memory seat ECU & switch

Wire harness

Body ECU
B1273
(DI±1949)Sliding roof ECU communication stop
(w/ Sliding roof)
Sliding roof ECU

Wire harness

Body ECU
B1287
(DI±1952)Back door ECU communication stop

Back door ECU

Wire harness

Body ECU
HINT:

When either DTC B1214 or B1215 is output, a DTC for another ECU communication stop may also
be output. In this case, perform troubleshooting for DTC B1214 or B1215 first. DTC B1214 or B1215
is output when a short to +B or short to ground occurs on a communication bus.

DTCs from B1221 to B1241 do not indicate that the corresponding switch is abnormal. They notify how
the switch is operating.
If the corresponding DTC is not indicated when operating a switch, there is a problem with the switch
contact.
If a DTC is indicated when not operating switches, the corresponding switch is stuck.

DI3IS±11
I27730
Instrument Panel J/B
Passenger Door ECU
(Power Window Switch) Combination Meter
Sliding Roof ECUDLC3 Body ECU
(Located behind
the instrument panel)
Driver Door ECU
(Power Window
Master Switch)
Back Door ECU
(Located inside the back door trim board) Automatic Light Control Sensor
Memory Seat ECU
& SwitchAirbag
Sensor
Assy
Power Window
Motor Front RH

Limit Switch

Pulse Switch Power Window
Motor Front LH

Limit Switch

Pulse Switch
A/C ECU
(Integration Control and Panel)
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1907
2101 Author: Date:
2005 SEQUOIA (RM1146U)
PARTS LOCATION

I28465
D22
Driver Door ECU
S19
Sliding Roof
Control ECU
Combination MeterI19
A/C ECU
(Integration Control and Panel)
Memory Seat ECU
& SwitchBody ECU
J/C
Back Door ECU
F18
Passenger
Door ECUInstrument Panel J/B
J/CIB1
1M 1GB7
B7
B5
M6 C5
II2J33 J34 BI2
BD2 BF1
B11 C5
C5
B11 J33 J34
BD2 BF1 II2 J33 J34 IB1MPX1
MPX2 MPX3 MPX1MPX2
MPX1
MPX1
MPX2 MPX1
MPX2
MPX1MPX±MPX+ W±L
G±B
G±O
LG±B L±Y
LG±RWW±L
G±O
W
LG±RLG±R
BLG±R
BBB B B
A G H A
G W
(*2)
10
8 11 (*2)
21
14762 4
G±B171 3 1324 31
32
30 8(*3)
(*1)
(*1) (*1)(*3) 3
9
1220 22
8
20
2
G±B
(*1): w/ Driving Position Memory
(*2): w/o Driving Position Memory
(*3): w/ Sliding Roof 8 (*1)(*1)
20
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1915
2109 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

DI±1916
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2110 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check apparatus.
CHECK:
Choose the apparatus to be inspected.
ApparatusGo to step
w/ Sliding roofA
w/o Sliding roofB
B Go to step 4.
A
2 Check the communication circuit inside the sliding roof control ECU.
PREPARATION:
Disconnect connector ºS19º of the sliding roof control ECU.
CHECK:
Check the DTC (See page DI±1904).
OK:
DTCs B1214 and/or B1215 are not indicated.
HINT:
Ignore any codes other than DTCs B1214 and B1215.
OK Replace sliding roof control ECU.
NG
3 Check for a short circuit between the sliding control ECU and body ECU.
PREPARATION:
(a) Reconnect connector ºS19º of the sliding roof control ECU (only vehicles w/ sliding roof).
(b) Disconnect connector ºB7º of the body ECU.
CHECK:
Check the DTC (See page DI±1904).
OK:
DTCs B1214 and/or B1215 are not indicated.
HINT:
Ignore any codes other than DTCs B1214 and B1215.

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1917
2111 Author: Date:
2005 SEQUOIA (RM1146U)
OK Repair or replace the wire harness between the
sliding roof control ECU and body ECU.
NG
4 Check the communication circuit inside the driver door ECU.
PREPARATION:
(a) Reconnect connector ºB7º of the body ECU (only vehicles w/ sliding roof).
(b) Disconnect connector ºD22º of the driver door ECU.
CHECK:
Check the DTC (See page DI±1904).
OK:
DTCs B1214 and/or B1215 are not indicated.
HINT:
Ignore any codes other than DTCs B1214 and B1215.
OK Replace the driver door ECU.
NG
5 Check the communication circuit inside the front passenger door ECU.
PREPARATION:
(a) Reconnect connector ºD22º of the driver door ECU.
(b) Disconnect connector ºF18º of the front passenger door ECU.
CHECK:
Check the DTC (See page DI±1904).
OK:
DTCs B1214 and/or B1215 are not indicated.
HINT:
Ignore any codes other than DTCs B1214 and B1215.
OK Replace the front passenger door ECU.
NG

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1949
2143 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1273 Sliding roof ECU communication stop
(w/ Sliding roof)
CIRCUIT DESCRIPTION
This DTC is indicated when communication fails between the sliding roof ECU and body ECU.
DTC No.DTC Detecting ConditionTrouble Area
B1273No communication from sliding roof ECU for more than 10
Sliding roof ECU
Wi hB1273No communication from sliding roof ECU for more than 10
seconds.
Wire harness

Body ECU
DIDFL±01

I28472
S19
Sliding Roof
Control ECUInstrument Panel J/BBody ECU
I18
Ignition SW
Instrument Panel J/B
F10
Fusible Link Block
Battery
IEJ8
J/C MPX1
E
B IGMPX3
IG1 AM11 2
AM1 ECU±IG
1F 1L 1MB7
1
6
12
1C4
SUN±ROOF
7 ALT
58W
AW±B B
W±B 1
5
1M
1M 10W±L
L±W B±RW±L
B±Y 2
7
51M 1G
L±WW±B G±O G±O
B±R 89
1220
1C DI±1950
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2144 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1951
2145 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check sliding roof ECU.
CHECK:
Check that the operation of the sliding roof function is normal.
HINT:
The operating condition of the sliding roof ECU CPU can be diagnosed with this check.
OK:
The sliding roof operates normally.
NG Go to power source circuit (See page DI±1668).
OK
2 Check wire harness and connector (Sliding roof control ECU ± body ECU).
PREPARATION:
Disconnect connector ºB7º of the body ECU and connector ºS19º of the sliding roof ECU.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Tester connection (Symbols)ConditionSpecified condition
S19±2 (MPX1) ± B7±20 (MPX3)AlwaysBelow 1 W
S19±2 (MPX1) ± Body groundAlways10 kW or higher
NG Repair or replace wire harness.
OK
Replace the sliding roof ECU.
If the problem recurs even after replacement, replace the body ECU.