Toyota Sienna Service Manual: Key Lock-in Prevention Function does not Work Properly (Manual Operation and Operation Interlocked with Key are Active)
DESCRIPTION
The un-lock warning switch turns ON when the key is inserted in the ignition key cylinder. The courtesy light switch turns ON when the driver side door is opened. These 2 switches are monitored by the body ECU.
In order to prevent the key from being locked in, the body ECU controls door locking operation according to the conditions of these switches so that the doors are not locked.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT FUSE (ECU-B)
- Remove ECU-B fuse from engine room junction block.
- Measure the resistance.
Standard resistance: Below 1 Ω
2 READ VALUE OF DATA LIST
- Using the intelligent tester, check that the un-lock warning switch signal is output when the switch is operated.
BODY (Multiplex network body ECU)
3 INSPECT UN-LOCK WARNING SWITCH ASSEMBLY
- Remove the un-lock warning switch.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
4 CHECK HARNESS AND CONNECTOR (UN-LOCK WARNING SWITCH ASSEMBLY - DRIVER SIDE J/B)
- Disconnect the K4 switch and B6 body ECU connectors.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY (MULTIPLEX NETWORK BODY ECU)
5 READ VALUE OF DATA LIST
- Using the intelligent tester, check that the driver side door courtesy light switch signal s output when the switch is operated.
BODY (Multiplex network body ECU)
6 INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE)
- Remove the courtesy light switch.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
7 CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY LIGHT SWITCH - DRIVER SIDE J/B)
- Disconnect the D7 switch and B9 body ECU connectors.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY (MULTIPLEX NETWORK BODY ECU)
All Doors cannot be Locked / Unlocked at Once
DESCRIPTION
The body ECU receives a switch signal from the master switch, the door
control switch, the driver door
key cylinder and the passenger door key cylinder and then drives the door lock
...
Only Back Door cannot be Opened
DESCRIPTION
With power back door: The signal for manual locking/unlocking operation of
the driver/passenger side
door and the signal for locking/unlocking operation interlocked with the driver
s ...
Other materials:
No. 1 Speaker with box
COMPONENTS
ON-VEHICLE INSPECTION
1. INSPECT NO.1 SPEAKER WITH BOX
HINT:
Remove interior parts so that the No.1 speaker with box
can be seen.
Check the speaker installation.
OK:
The speaker is securely installed.
If the result is not as specified, reinstall the No.1
s ...
Reassembly
1. INSTALL IGNITION OR STARTER SWITCH
ASSEMBLY
(a) Install the ignition or starter switch assembly to the
steering column bracket assembly UPR with the 2
screws.
2. INSTALL KEY INTER LOCK SOLENOID
(a) Install the solenoid to the steering column bracket
assembly with the 2 screws.
3. INSTALL ...
Removal
HINT:
On the RH side, use the same procedures as on the LH side.
1. REMOVE BACK DOOR STAY SUB-ASSEMBLY LH
Remove the 2 bolts and disconnect the stay from
the body panel.
Using the screwdriver, disengage the clips and
remove the stay from the door panel.
Remove the bolt from door pa ...
