2001 TOYOTA SEQUOIA Page 18

DI3IR±10
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1905
2099 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
If a trouble code is indicated during the DTC check, check the components listed for that code in the table
below (proceed to the page given for that code).
DTC No.
(See Page)Detection ItemTrouble Area
B1211
(DI±1908)Driver door ECU communication stop

Driver door ECU

Wire harness

Body ECU
B1212
(DI±1911)Front passenger door ECU communication stop

Passenger door ECU

Wire harness

Body ECU
B1214
B1215
(DI±1914)Communication bus malfunction (Short to B+)
Communication bus malfunction (Short to ground)

Driver door ECU

Passenger door ECU

Back door ECU

A/C ECU (Integration control panel)

Combination meter

Memory seat ECU & switch

Wire harness

Body ECU
B1221
(DI±1924)Power window switch circuit on driver door

Power window master switch (Built in driver door ECU)

Wire harness

Body ECU
B1222
(DI±1925)Door lock switch circuit on driver door

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

Door unlock detection switch front LH

Wire harness

Body ECU
B1223
(DI±1926)Power window switch circuit on passenger door

Power window switch (Built in passenger door ECU)

Wire harness

Body ECU
B1224
(DI±1927)Door lock switch circuit on passenger door

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

Door unlock detection switch front RH

Wire harness

Body ECU
B1231
(DI±1928)Jam protection limit switch circuit on driver door

Limit switch (Built in power window motor)

Driver door ECU

Wire harness

Body ECU
B1232
(DI±1929)Jam protection pulse switch circuit on driver door

Pulse switch (Built in power window motor)

Driver door ECU

Wire harness

Body ECU
B1233
(DI±1930)Jam protection limit switch circuit on passenger door

Limit switch (Built in power window motor)

Passenger door ECU

Wire harness

Body ECU
B1234
(DI±1931)Jam protection pulse switch circuit on passenger door

Pulse switch (Built in power window motor)

Passenger door ECU

Wire harness

Body ECU
B1241
(DI±1932)Body ECU switch circuit diagnosis

Back door power window switch

Rear wiper and washer switch

Wire harness

Body ECU

DI±1910
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2104 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check driver door ECU.
CHECK:
Check if the driver door window glass auto up function operates normally through the power window master
switch.
HINT:
With this inspection, the driver door ECU CPU can be diagnosed if it works normally or not.
OK:
Driver door side power window auto up function operates normally.
NG Go to power source circuit (See page DI±1788).
OK
2 Check wire harness and connector (Driver door ECU ± body ECU and driver door
ECU ± passenger door ECU).
PREPARATION:
Disconnect connector ºB7º of the body ECU, ºD22º of the driver door ECU and ºF18º the passenger door
ECU.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Symbols (Tester connection)ConditionSpecified condition
MPX1 (B7±22) ± MPX2 (D22±8)AlwaysBelow 1 W
MPX1 (D22±20) ± MPX2 (F18±11)AlwaysBelow 1 W
MPX1 (B7±22) ± Body groundAlways10 kW or higher
MPX1 (D22±20) ± Body groundAlways10 kW or higher
NG Repair or replace wire harness.
OK
Replace the driver door ECU.
If the problem reoccurs even after replacement, replace the body ECU.

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1913
2107 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check passenger door ECU.
CHECK:
Check if the passenger door window glass auto up function operates normally through the front passenger
door window switch.
HINT:
With this inspection, the passenger door ECU CPU can be diagnosed if it works normally or not.
OK:
Front passenger side power window auto up function operates normally.
NG Go to power source circuit (See page DI±1826).
OK
2 Check wire harness and connector (Passenger door ECU ± driver door ECU,
back door ECU).
PREPARATION:
Disconnect connector ºD22º of the driver door ECU, ºF18º of the passenger door ECU and ºB11º of the back
door ECU.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Symbols (Tester connection)ConditionSpecified condition
MPX1 (D22±20) ± MPX2 (F18±8) (*1)AlwaysBelow 1 W
MPX1 (D22±20) ± MPX2 (F18±11) (*2)AlwaysBelow 1 W
MPX2 (B11±1) ± MPX1 (F18±20) (*1)AlwaysBelow 1 W
MPX2 (B11±1) ± MPX1 (F18±10) (*2)AlwaysBelow 1 W
MPX1 (D22±20) ± Body groundAlways10 kW or higher
MPX1 (B11±1) ± 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 passenger door ECU.
If the problem reoccurs even after replacement, replace the body ECU.

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

DI±1918
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2112 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check for a short circuit between the driver door ECU and front passenger door
ECU.
PREPARATION:
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 Repair or replace the wire harness between the
driver door ECU and front passenger door ECU.
NG
7 Check communication circuit inside the back door ECU.
PREPARATION:
(a) Reconnect connector ºD22º of the driver door ECU.
(b) Reconnect connector ºF18º of the passenger door ECU.
(c) 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 Replace the back door ECU.
NG

± 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