TOYOTA SEQUOIA 2001 Service Repair Manual

± 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.

DI±1952
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2146 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1287 Back door ECU communication stop
CIRCUIT DESCRIPTION
This DTC is indicated when communication fails between the back door ECU and body ECU.
DTC No.DTC Detecting ConditionTrouble Area
B1287No communication from back door ECU for more than 10 se-
conds.
Back door ECU

Wire harness

Body ECU
DIDFM±01

I28473
Combination Meter
F18
Front Passenger
Door ECUBack Door ECU
Sub J/B No. 3I18
Ignition SW Instrument Panel J/B
F10
Fusible Link Block
Engine Room J/BInstrument Panel J/B
Sub J/B No. 3
Battery
BJJ19
J/CJ22
J/C J37
J/CJ/C
J/C J33 J34
J33 J34 C5B11 BF1 BD2
II2B11
B11
B11 BF1 BD2
BD2 BF1 IN1
AM1 ECU±IG
1F
1L
1G1C
14
6
12
1C
154
12PWR No. 5 ALT
58
43C 3A88AAGAB H
IG1
AM1
1 26 7 312
1
6
4 2
5 11 1114 8
BB B B B
20 (*1)LG±R
B±RLG±R LG±R LG±R
B±RB±R B±R B±R
B±R B±Y
W±L W
B B
L±W L±W L±W L±W
W±R
W±R W±R
W±R W±R W±R
W±B W±B W±B W±B
A212
BB3 5
B11
B11 10 12 11 2
3A 3C
BD2 BF1
BF1 BD1IN1BF1 BD1 IC4
2 3 8 1
1J
1E 2C 2DECU±B
Short Pin
23
10MPX1
SIG
BDR
GND MPX2
BECU MPX1
*1: w/ Driving Position Memory
*2: w/o Driving Position Memory 10 (*2)
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1953
2147 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

DI±1954
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2148 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check back door ECU.
CHECK:
Check that the operation of the rear wiper motor function is normal.
HINT:
With this inspection, the back door ECU CPU can be diagnosed if it works normally or not.
OK:
Rear wiper motor operates normally.
NG Replace the back door ECU.
OK
2 Check wire harness and connector (Back door ECU ± combination meter, back
door ECU ± passenger door ECU).
PREPARATION:
Disconnect connector ºF18º of the passenger door ECU, connector ºB11º of the back door ECU and connec-
tor ºC5º of the combination meter ECU.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Tester connection (Symbols)ConditionSpecified condition
B11±2 (MPX1) ± C5±31AlwaysBelow 1 W
B11±1 (MPX2) ± F18±10 (*1)AlwaysBelow 1 W
B11±1 (MPX2) ± F18±20 (*2)AlwaysBelow 1 W
B11±1 (MPX2) ± Body groundAlways10 kW or higher
B11±2 (MPX1) ± Body groundAlways10 kW or higher
*1: w/ Driving Position Memory
*2: w/o Driving Position Memory
NG Repair or replace wire harness.
OK
Replace the back door ECU.
If the problem recurs even after replacement, replace the body ECU.

DID9J±01
± DIAGNOSTICSAUDIO SYSTEM
DI±1955
2149 Author: Date:
2005 SEQUOIA (RM1146U)
AUDIO SYSTEM
PRECAUTION
NOTICE:
When disconnect the battery terminal, initialize the following systems after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77

DID9K±01
I27726
Radio Receiver Assy
Rear Door Speaker Tweeter
Rear Door Speaker Front Door Speaker (*1)
Front Door Speaker and
Woofer (*2)Steering Pad
Switch
Instrument Panel J/B

RAD NO. 2 Fuse

ECU±B Fuse

AM1 FuseEngine Room J/B

RAD NO. 1 Fuse

RAD NO. 3 Fuse
Ignition Switch
Disc Player
Controller
(*3)
Stereo
Component
AmplifierMulti±display
Controller (*3)
VTR
Terminal
(*3)Headphone
Terminal
(*3, *4)
Television Display Assy (*3)
Rear Seat Audio
Controller Assy (*4)
Radio Sub
Antenna*1: Built±in Type Amplifier
*2: Separate Type Amplifier
*3: w/ RSE System
*4: w/ RSA System Radio Main Antenna
DI±1956
± DIAGNOSTICSAUDIO SYSTEM
2150 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DID9L±01
I28760
Built±in Type Amplifier:
Radio
Receiver
Assy
Steering Pad SwitchSpeakers Sound Signal Operation
Signal
Sound Signal
± DIAGNOSTICSAUDIO SYSTEM
DI±1957
2151 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

I28735
Separate Type Amplifier:
Steering Pad Switch
AVC±LAN Speakers
Sound SignalOperation
Signal
Radio
Receiver
Assy Stereo
Component
Amplifier
Assy
Multi±display
Controller
Assy (*1)
Rear Seat Audio
Controller (*2)
*1: w/ Rear Seat Entertainment System
*2: w/Rear Seat Audio System
Display Signal DI±1958
± DIAGNOSTICSAUDIO SYSTEM
2152 Author: Date:
2005 SEQUOIA (RM1146U)