2001 TOYOTA SEQUOIA key

I18725
Back Door ECU
BKUL
12G B12
Back Door Key Lock and Unlock SW
3R±W
LKEYE
BKL 5 4 B1019
B10
B10 DI±1882
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2076 Author: Date:
2005 SEQUOIA (RM1146U)
Back door key lock and unlock switch circuit
CIRCUIT DESCRIPTION
The back door ECU operates the back door lock motor based on information from the back door key lock
and unlock switch.
The back door power window goes up when the key is inserted into the cylinder and turned to the LOCK
position. The window goes down when the key is turned to the UNLOCK position.
WIRING DIAGRAM
DI94L±05

± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
DI±1883
2077 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Check the back door key lock and unlock switch using hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
According to the display on the tester, read the DATA LIST.
BACK±DOOR:
ItemMeasurement Item/
Display (Range)Normal ConditionDiagnostic Note
KEY SW (UNLOCK)Unlock SW linked with
the key/ON or OFFON: Back door lock is in unlock position
OFF: Back door lock is in lock position±
KEY SW (LOCK)Unlock SW linked with
the key/ON or OFFON: Back door lock is in lock position
OFF: Back door lock is in unlock position±
UP/DOOR KEY
Back door key lock
and unlock switch
linked window open
and close/AVAIL or
NOT AVL
AVAIL: Key±linked open and close SET
NOT AVL: Key±linked open and close UNSET*1
DOWN/DOOR KEY
Back door key lock
and unlock switch
linked window open
and close/AVAIL or
NOT AVL
AVAIL: Key±linked open and close SET
NOT AVL: Key±linked open and close UNSET*1
*1: When the ignition key is not in the key cylinder and the back door is locked, turning and holding the back
door key in the lock position for 1.5 seconds or more activates the back door ECU to operate the power win-
dow motor and close the power window.
Similarly, turning and holding the back door key in the unlock position for 1.5 seconds or more when the back
door is unlocked will open the power window.
OK:
Indication on the tester switches between ON and OFF in accordance with the back door key
lock and unlock switch status.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1854).
NG

DI±1884
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2078 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check the back door key lock and unlock switch (See page BE±79).
NG Replace the back door key lock and unlock
switch.
OK
3 Check wire harness and connector between back door key lock and unlock
switch and back door ECU (See page IN±35).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1854).

± 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

± 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±1982
± DIAGNOSTICSAUDIO SYSTEM
2176 Author: Date:
2005 SEQUOIA (RM1146U)DE
*4
Slave Reset (Momentary Inter-
ruption)After the engine was started, component shown
by sub code was disconnected from system.
1. Power source circuit (Stereo
component amplifier assy).
2. Power source circuit (Rear seat
audio controller). *6
3. Power source circuit (Multi±dis-
play controller sub±assy) *7
4. AVC±LAN circuit (Radio receiver
assy ± Stereo component ampli-
fier assy).
5. AVC±LAN (Radio receiver assy
± Rear seat audio controller). *6
6. AVC±LAN (Radio receiver assy
± Multi±display controller sub±
assy). *7
7. Replace stereo component am-
plifier assy.
8. Replace rear seat audio control-
ler. *6
9. Replace multi±display controller
sub±assy. *7DI±1993
DI±2058
DI±2110
DI±2023
DI±2061
DI±2139
±
±
±
DF
*4Master Error
Due to defective cognition of component with a
display, master function is switched to audio
equipment.
1. Power source circuit (Stereo
component amplifier assy).
2. Power source circuit (Rear seat
audio controller). *6
3. Power source circuit (Multi±dis-
play controller sub±assy) *7
4. AVC±LAN circuit (Radio receiver
assy ± Stereo component ampli-
fier assy).
5. AVC±LAN (Radio receiver assy
± Rear seat audio controller). *6
6. AVC±LAN (Radio receiver assy
± Multi±display controller sub±
assy). *7
7. Replace stereo component am-
plifier assy.
8. Replace rear seat audio control-
ler. *6
9. Replace multi±display controller
sub±assy. *7DI±1993
DI±2058
DI±2110
DI±2023
DI±2061
DI±2139
±
±
±
HINT:

*1: This code may be recorded depending on the battery condition or engine start voltage even if no
failure is detected.

*2: If the power connector is disconnected after the engine starts, this code is recorded after 180 se-
conds.

*3: This code may be stored if the ignition key is turned to the START position again with the engine
running.

*4: This code may be stored if the ignition key is held in the START position for 1 minute or more before
returning to the ON position.

*5: If the device is reported as not existing during verification, check the power source circuit and AVC±
LAN circuit for the device.

*6: w/ Rear seat audio system only.

*7: w/ Rear seat entertainment system only.

± DIAGNOSTICSAUDIO SYSTEM
DI±1985
2179 Author: Date:
2005 SEQUOIA (RM1146U)
Logical address: 01 (Communication control) continued
DTCNameDiagnosisVerificationSee page
DF
*4Master Error
Due to defective condition of component with a
display, master function is switched to audio
equipment.
Error occurs in communication between sub±
master (audio) and master component.
1. Power source circuit (Radio re-
ceiver assy).
2. Power source circuit (Stereo
component amplifier assy).
3. AVC±LAN circuit (Radio receiver
assy ± Stereo component ampli-
fier assy).
4. AVC±LAN (Radio receiver assy
± Rear seat audio controller). *5
5. AVC±LAN (Radio receiver assy
± Multi±display controller sub±
assy). *6
6. Replace radio receiver assy.
7. Replace stereo component am-
plifier assy.DI±1990
DI±1993
DI±2023
DI±2061
DI±2139
±
±
E0
*1Registration Completion
Instruction ErrorºRegistration Completion Instructionº command
from master cannot be received.Since this DTC is provided for engi-
neering purposes, it may be de-
tected when no actual failure exists.
±
E1
*1Audio processor ON errorWhile source equipment is operating, AMP output
stops.
1. Power source circuit (Radio re-
ceiver assy).
2. Power source circuit (Stereo
component amplifier assy).
3. AVC±LAN circuit (Radio receiver
assy ± Stereo component ampli-
fier assy).
4. AVC±LAN (Radio receiver assy
± Rear seat audio controller). *5
5. AVC±LAN (Radio receiver assy
± Multi±display controller sub±
assy). *6
6. Replace radio receiver assy.
7. Replace stereo component am-
plifier assy.DI±1990
DI±1993
DI±2023
DI±2061
DI±2139
±
±
E2ON/OFF Instruction Parameter
ErrorError occurs in ON/OFF controlling command
from radio receiver assy.Replace radio receiver assy.±
E3
*1Registration Request Transmis-
sionRegistration Request command is output from
slave component.Since this DTC is provided for engi-
neering purposes, it may be de-
tected when no actual failure exists.
±
HINT:

*1: This code may be recorded depending on the battery condition or engine start voltage even if no
failure is detected.

*2: This code may be stored if the ignition key is turned to the START position again with the engine
running.

*3: This code may be stored if the ignition key is held in the START position for one minute or more
before returning to the ON position.

*4: If the device is reported as not existing during verification, check the power source circuit and AVC±
LAN circuit for the device.

*5: w/ Rear seat audio system only.

*6: w/ Rear seat entertainment system only.

± DIAGNOSTICSAUDIO SYSTEM
DI±1987
2181 Author: Date:
2005 SEQUOIA (RM1146U)E0
*1
Registration Completion
Instruction ErrorºRegistration Completion Instructionº command
from master cannot be received.Since this DTC is provided for engi-
neering, it may be detected when no
actual failure exists.
±
E3
*1Registration Request Transmis-
sion

Registration Request command is output from
slave component.

Registration Request command is output from
sub±master component.Since this DTC is provided for engi-
neering, it may be detected when no
actual failure exists.
±
DF
*4Master Error
Due to defective condition of component with a
display, master function is switched to audio
equipment.
Error occurs in communication between sub±
master (audio) and master component.
1. Power source circuit (Radio re-
ceiver assy).
2. AVC±LAN (Radio receiver assy
± Multi±display controller sub±
assy).
3. Replace Multi±display controller
sub±assy.DI±1990
DI±2139
±
E4
*1Multiple Frame AbortMultiple frame transmission is aborted.
Since this DTC is provided for engi-
neering purpose, it may be detected
when no actual failure exists.
±
HINT:

*1: Even if no failure is detected, this code may be stored depending on the battery condition or voltage
for starting an engine.

*2: This code is stored when 180 sec. has passed after the power supply connector is pulled out after
engine start.

*3: This code may be stored when the engine key is turned back to the ON position and then turned
again to the START position in 1 minute after engine start.

*4: This code may be stored when the engine key is turned back to the ON position and then turned
again to the START position after engine start.
Rear seat audio controller (Physical address: 1F4) [RSA]
(a) Logical address: 01 (Communication control)
DTCNameDiagnosisVerificationSee page
D6
*1Absence of Master
Component in which this code is recorded has
been disconnected from system with ignition in
ACC or ON. Or, when this code was recorded,
RSA panel was disconnected.
1. Power source circuit (Radio re-
ceiver assy).
2. AVC±LAN (Radio receiver assy
± Rear seat audio controller).
3. Replace Rear seat audio control-
ler.DI±1990
DI±2061
±
D7
*2Connection Check Error
Component in which this code is recorded has
been disconnected from system after engine start.
Or, when this code was recorded, RSA panel was
disconnected.
1. Power source circuit (Radio re-
ceiver assy).
2. AVC±LAN (Radio receiver assy
± Rear seat audio controller).
3. Replace Rear seat audio control-
ler.DI±1990
DI±2061
±
DC
*3Transmission Error
Transmission to component shown by sub±code
has been failed.
(This code does not necessarily mean actual fail-
ure.)If same sub±code is recorded in
other component(s), check harness
for power supply and communica-
tion system of all components
shown by code.
±
DD
*4Master Reset (Momentary Inter-
ruption)Component that is to be master has been discon-
nected after engine start.
1. Power source circuit (Radio re-
ceiver assy).
2. AVC±LAN (Radio receiver assy
± Rear seat audio controller).
3. Replace Rear seat audio control-
ler.DI±1990
DI±2061
±