TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1919
2113 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check for a short circuit between the front passenger door ECU and back door
ECU.
PREPARATION:
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 Repair or replace the wire harness between the
front passenger door ECU and back door ECU.
NG
9 Check the communication circuit inside the integration control and panel.
PREPARATION:
(a) Reconnect connector ºF18º of the passenger door ECU.
(b) Reconnect connector ºB11º of the back door ECU.
(c) Disconnect connector ºI19º of the integration control and panel.
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 integration control and panel.
NG

DI±1920
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2114 Author: Date:
2005 SEQUOIA (RM1146U)
10 Check for a short circuit between the integration control and the panel and the
body ECU.
PREPARATION:
Disconnect connector ºB5º 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.
OK Repair or replace the wire harness between the
integration control and panel and the body ECU.
NG
11 Check apparatus.
CHECK:
Choose the apparatus to be inspected.
ApparatusGo to step
w/ Driving position memoryA
w/o Driving position memoryB
B Go to step 14.
A

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1921
2115 Author: Date:
2005 SEQUOIA (RM1146U)
12 Check the communication circuit inside the memory seat ECU & switch.
PREPARATION:
(a) Reconnect connector ºI19º of the integration control and panel.
(b) Reconnect connector ºB5º of the body ECU.
(c) Disconnect connector ºM6º of the memory seat ECU & switch.
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 memory seat ECU & switch.
NG
13 Check for a short circuit between the memory seat ECU and switch & combina-
tion meter.
PREPARATION:
Disconnect connector ºC5º of the combination meter.
CHECK:
Measure the resistance according to the value(s) in the table below.
OK:
Symbols (Tester connection)ConditionSpecified condition
MPX1 (M6±1) ± Body groundAlways10 kW or higher
NG Repair or replace the wire harness between the
memory seat ECU & switch and combination
meter.
OK

DI±1922
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2116 Author: Date:
2005 SEQUOIA (RM1146U)
14 Check the communication circuit inside the combination meter ECU.
PREPARATION:
(a) Reconnect connector ºM6º of the memory seat ECU & switch (only vehicles w/ driving position
memory).
(b) Reconnect connector ºI19º of the integration control and panel (only vehicles w/o driving position
memory).
(c) Reconnect connector ºB5º of the body ECU (only vehicles w/o driving position memory).
(d) Disconnect connector ºC5º of the combination meter ECU (only vehicles w/o driving position memory).
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 combination meter ECU.
NG
15 Check for a short circuit between the combination meter ECU and back door
ECU.
PREPARATION:
Disconnect connector ºB11º of the back 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 Repair or replace the wire harness between the
combination meter ECU and back door ECU.
NG

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1923
2117 Author: Date:
2005 SEQUOIA (RM1146U)
16 Check for a short circuit between the combination meter and the integration con-
trol and panel.
PREPARATION:
(a) Reconnect connector ºB11º of the back door ECU.
(b) Disconnect connector ºI19º of the integration control and panel.
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 Repair or replace the wire harness between the
combination meter and the integration control
and panel.
NG
17 Check for a short circuit between the body ECU and driver door ECU.
PREPARATION:
(a) Reconnect connector ºI19º of the integration control and panel.
(b) Reconnect connector ºC5º of the combination meter.
(c) Disconnect connector ºD22º of the driver door ECU.
(d) Disconnect connector ºB6º 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.
OK Repair or replace the wire harness between the
body ECU and driver door ECU.
NG
Replace the body ECU.

DI±1924
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2118 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1221 Power window switch circuit on driver
door
CIRCUIT DESCRIPTION
This DTC is output only if the power window master switch AUTO UP/DOWN operation is performed.
If the DTC is not output, the following may be malfunctioning:
DTC No.DTC Detecting ConditionTrouble Area
B1221Does not operate either of the power window master switch
(except window lock switch)
Power window master switch (Built in driver door ECU)

Wire harness

Body ECU
HINT:
For details of inspection, see page DI±1782.
If the problem reoccurs even after replacement, replace the body ECU.
DI1SP±08

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1925
2119 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1222 Door lock switch circuit on driver door
CIRCUIT DESCRIPTION
This DTC is output while the body ECU senses the door unlock state through the door unlock detection
switch, which is built into the door lock motor.
If the DTC is not output, the following may be malfunctioning:
DTC No.DTC Detecting ConditionTrouble Area
B1222Does not operate door key lock and unlock switch

Door lock control switch front LH (Built in driver door ECU)

Door unlock detection switch front LH

Wire harness

Body ECU
HINT:
For details of inspection, see page DI±1782.
If the problem reoccurs even after replacement, replace the body ECU.
DIDFD±01

DI±1926
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2120 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1223 Power window switch circuit on pas-
senger door
CIRCUIT DESCRIPTION
This DTC is output only if the power window switch AUTO UP/DOWN operation is performed.
If the DTC is not output, the following may be malfunctioning:
DTC No.DTC Detecting ConditionTrouble Area
B1223Does not operate power window switch or door lock control

Power window switch (Built in passenger door ECU)

Wire harness

Body ECU
HINT:
For details of inspection, see page DI±1818.
If the problem reoccurs even after replacement, replace the body ECU.
DIDFE±01

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1927
2121 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1224 Door lock switch circuit on passenger
door
CIRCUIT DESCRIPTION
This DTC is output while the body ECU senses the door lock state through the door unlock detection switch,
which is built into the door lock motor.
If the DTC is output, the following may be malfunctioning:
DTC No.DTC Detecting ConditionTrouble Area
B1224Does not operate door key lock and unlock switch

Door lock control switch front RH
(Built in passenger door ECU)

Door unlock detection switch front RH

Wire harness

Body ECU
HINT:
For details of inspection, see page DI±1818.
If the problem reoccurs even after replacement, replace the body ECU.
DIDFF±01

DI±1928
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2122 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1231 Jam protection limit switch circuit on
driver door
CIRCUIT DESCRIPTION
This DTC is output while the body ECU senses the limit position through the limit switch, which is built into
the power window motor.
If the DTC is not output, the following may be malfunctioning:
DTC No.DTC Detection ConditionTrouble Area
B1231
No change in limit switch position for more than 2.0 seconds
even if moving the glass down when limit switch is OFF
(window glass is fully closed)
Limit switch (Built in power window motor)

Driver door ECU

Wire harness

Body ECU
HINT:
For details of inspection, see page DI±1782.
If the problem reoccurs even after replacement, replace the body ECU.
DI1T1±06