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05-1615
DIAGNOSTICS - POWER DOOR LOCK CONTROL SYSTEM 05BZ1-04
ONLY BACK DOOR CAN NOT BE OPENED (UNLOCKED) (W/
POWER BACK DOOR)
CIRCUIT DESCRIPTION
The signal for manual locking/unlocking operation of the driver/passenger side door and the signal for lock-
ing/unlocking operation interlocked with the driver side door key cylinder are sent to the back door ECU from
the body ECU using the MPX line. In response to these signals, the back door ECU causes the back door
lock to be locked/unlocked. The ON signal of the back door opener switch, which is output when the switch
is pressed, is directly sent to the back door ECU. In response to this signal, the back door ECU causes the
back door lock to be open.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1798
05-1616
DIAGNOSTICS - POWER DOOR LOCK CONTROL SYSTEM
WIRING DIAGRAM
D9 Instrument Panel J/B Assy
Power Window Regulator Master Switch Assy
(Door Control Switch) Multiplex Network Body ECU
7 25
LOCK 5 R-Y R-Y 9
IA2 1K L1
W-B 1
9 22
8 G G 12
D10 UNLOCK IA2 1K UL1
Door Control Switch Assy (Passenger Side)
3 3
LOCK
6 R-Y R-Y
IM1 1J
W-B 3
5 4
5 G G
UNLOCK IM1 1J
D11 J18
Front Door w/ Motor Lock Assy LH 5 J/C 26
9 LG LG 94 84 LG 10
IA1 1K L2
W-B 7
7 5
10 L L
IA1 1J
D12
Front Door w/ Motor Lock Assy RH 4
W-B 6 LG LG
IM1
W-B 8
6 8
W-B 5 L-Y L-Y
IM2 B9 UL3
1 IA1 2 IM2
4
W-B W-B B7 UL2
IE IG
Power Back Door ECU J37 J19
J/C J/C J/C
22 20 4 21
MPX1 P13 1 11 73 13
J14 J13 B7 MPX2
R-L R-L R-L R-L
3 1 12
G-B G-B G-B 1 2
HSW P13 BH1 BG1
B12
7 8 Back Door Opener
R R 5
HAF P13 BG3 Switch Assy W-B
21 4
V V 6
POS P13 BG3
A
8 11
B-W B-W 3 4 W-B A J41
FUL P13 BG3
J/C
12 1
L-W L-W 1
DC+ P13 BG3
11 2
G G 2 BN
DC- P13 BG3
B10
Back Door Lock Assy B69849
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1799
05-1617
DIAGNOSTICS - POWER DOOR LOCK CONTROL SYSTEM
INSPECTION PROCEDURE
1 CHECK DTC
(a) Use the hand-held tester to check for normal function of the multiplex communication system.
(1) (ECU unconnected, communication line malfunctioning) Without DTC B1214, B1215 or B1287
outputs, proceed to A.
(2) (ECU unconnected, communication line malfunctioning) With DTC B1214, B1215 or B1287 out-
puts, proceed to B.
B GO TO MULTIPLEX COMMUNICATION SYSTEM
(See page 05-1876 )
A
2 PERFORM ACTIVE TEST USING HAND-HELD TESTER
(a) Select the ACTIVE TEST and then check that the power door lock operates.
HINT:
During the ACTIVE TEST, the hand-held tester sends a signal to the body ECU to drive all the power door
lock motors. If all the power door locks operate, the power door lock motors and the wire harness between
the power door lock motors and body ECU are considered to be functioning normally.
Standard (Multiplex network body ECU):
Item Test Details Diagnostic Note
Operate the door lock motor for all doors
DOOR LOCK -
OFF/LOCK/UNLOCK
OK REPLACE INSTRUMENT PANEL JUNCTION
BLOCK ASSY (MULTIPLEX NETWORK BODY
ECU)
NG
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1800
05-1618
DIAGNOSTICS - POWER DOOR LOCK CONTROL SYSTEM
3 INSPECT BACK DOOR LOCK ASSY
(a) Check operation of the door lock.
(1) Using a screwdriver, push the latch in order to put
the back door lock in the locked condition (full-latch
position).
(2) Connect the battery positive (+) lead to terminal 1
and the battery negative (-) lead to terminal 2.
Then, check operation of the latch.
Standard: The latch turns to the open-latch position
(3) Inspect motor operation when battery voltage is ap-
plied to the terminals.
Standard:
Measurement Condition Specified Condition
Battery positive (+) Terminal 2
Clockwise Motor in normal rotation
Full-latch Battery negative (-) Terminal 1
Battery positive (+) Terminal 1
Counterclockwise (Motor in reverse rotation)
Battery negative (-) Terminal 2
Open-latch
B67754
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1801
05-1619
DIAGNOSTICS - POWER DOOR LOCK CONTROL SYSTEM
(b) Check the back door courtesy lamp switch resistance.
(1) Check the resistance between the terminals of the
courtesy switch.
Standard:
Terminal No. Door Lock Latch Position Specified Condition
Open-latch position, Half-
Below 1
latch position
3 -4
Full-latch position, Over-
10 k or higher
latch position
(c) Check the back door latch switch resistance.
Open-latch (1) Check the resistance between the terminals of the
latch switch.
Standard:
Terminal No. Door Lock Latch Position Specified Condition
Open-latch position,
Below 1
Over-latch position
4 -5
Half-latch Half-latch position, Full-
10 k or higher
latch position
(d) Check the position switch resistance.
(1) Connect the battery positive (+) lead to connector
terminal 1 and the negative (-) lead to connector
terminal 2.
Full-latch
(2) Check the resistance between the terminals of the
latch switch.
Standard:
Terminal No. Door Lock Latch Position Specified Condition
Any position other than
Over-latch motor stop position (Motor 10 k or higher
4 -6 in operation)
Motor stop position (Gear
B62719 Below 1
in original position
NG REPLACE BACK DOOR LOCK ASSY
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1802
05-1620
DIAGNOSTICS - POWER DOOR LOCK CONTROL SYSTEM
4 CHECK WIRE HARNESS (BACK DOOR LOCK ASSY - POWER BACK DOOR ECU )
Wire Harness Side (a) Disconnect the B10 lock and P13 ECU connectors.
B10 (b) Check the resistance between the wire harness connec-
Back Door Lock Assy tors.
Standard (Check for open circuit):
Terminal No. Specified Condition
B10-5 - P13-7 (HAF)
B10-6 - P13-21 (POS)
B10-3 - P13-8 (FUL) Below 1
B10-1 - P13-12 (DC+)
B10-2 - P13-11 (DC-)
P13
Power Back Door ECU
B68432 NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
5 READ VALUE OF HAND-HELD TESTER
(a) Using the hand-held tester, check the DATA LIST for proper functioning of the back door opener
switch.
Standard (Power back door ECU):
Diagnostic
Item Measurement Item/Display (Range) Normal Condition
Note
Back door opener switch signal ON: Back door opener switch is pushed
B DOR OPEN SW -
/ON or OFF OFF: Back door opener switch is not pushed
OK REPLACE INSTRUMENT PANEL JUNCTION
BLOCK ASSY (MULTIPLEX NETWORK BODY
ECU)
NG
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1803
05-1621
DIAGNOSTICS - POWER DOOR LOCK CONTROL SYSTEM
6 INSPECT BACK DOOR OPENER SWITCH ASSY
(a) Remove the back door opener switch.
(b) Inspect the resistance of the switch.
Standard:
Terminal No. Condition Specified Condition
Free 10 k or higher
1 -2
Pushed Below 1
Pushed
Free B68466 NG REPLACE BACK DOOR OPENER SWITCH
ASSY
OK
7 CHECK WIRE HARNESS (BACK DOOR OPENER SWITCH - POWER BACK DOOR
ECU AND BODY GROUND)
Wire Harness Side (a) Disconnect the B12 switch and P13 ECU connectors.
(b) Check the resistance between the wire harness side con-
B12 nectors.
Back Door Opener Switch Standard (Check for open circuit):
Terminal No. Specified Condition
B12-1 - P13-3 (HSW) Below 1
(c) Check the resistance between the B12 switch connector
and body ground.
Standard (Check for open circuit):
Terminal No. Specified Condition
P13 B12-2 - Body ground Below 1
Power Back Door ECU
B68924 NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY (MULTIPLEX NETWORK BODY ECU)
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1804
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