Toyota Sienna Service Manual: Fold Seat Switch Circuit
DESCRIPTION
When the fold seat switch is operated, a switch operation signal is sent to the fold seat control ECU. The ECU receives switch operation signals from each switch and activates the folding motor, reclining motor, and release actuator.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT FOLD SEAT CONTROL ECU
- Remove the fold seat control ECU with connectors still connected.
- Measure the voltage according to the value(s) in the table below.
Standard voltage: LH side
RH side
2 INSPECT FOLD SEAT SWITCH
- Remove the fold seat switch.
- Disconnect the connector from the fold seat switch.
- Measure the resistance according to the value(s) in the table below.
Standard resistance: LH side
RH side
3 CHECK HARNESS AND CONNECTOR (FOLD SEAT SWITCH - FOLD SEAT CONTROL ECU)
- Disconnect the connector from the fold seat control ECU.
- Measure the resistance according to the value(s) in the table below.
Standard resistance: LH side
RH side
4 CHECK HARNESS AND CONNECTOR (BACK DOOR COURTESY SWITCH - FOLD SEAT SWITCH)
- Disconnect the connector from the back door courtesy switch.
- Measure the resistance according to the value(s) in the table below.
Standard resistance: LH side
RH side
5 INSPECT BACK DOOR COURTESY SWITCH
- Measure the resistance according to the value(s) in the table below.
Standard resistance
6 CHECK HARNESS AND CONNECTOR (BACK DOOR COURTESY SWITCH - BODY GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard resistance
REPLACE FOLD SEAT CONTROL ECU
Power Source Circuit
DESCRIPTION
Power is supplied to the fold seat control ECU through the L-RR2 SEAT and
R-RR2 SEAT fuses.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT FUSE (L-RR2 SEAT, R-RR2 SEAT)
Re ...
Folding Motor Circuit
DESCRIPTION
The fold seat control ECU receives a switch operation signal from the fold
seat switch and activates the
folding motor. At this time, the Hall IC (seat cushion position sensor) detects ...
Other materials:
Terminals of ecu
1. A/C AMPLIFIER
(a) Waveform 1:
(b) Waveform 2:
(c) Waveform 3: ...
Disassembly
1. REMOVE FRONT DISC BRAKE BUSH DUST BOOT
(a) Using soft jaws on the vise, hold the front disc brake
cylinder mounting LH in the vise through aluminum
plates.
(b) Using a screwdriver and hammer, remove the 2
front disc brake bush dust boots from the front disc
brake cylinder mounting LH. ...
Noise Occurs
INSPECTION PROCEDURE
1 NOISE CONDITION
Check in which direction the noise comes from (front left
or right, or rear left or right).
Check in which direction the noise comes from.
OK:
The location of the noise source can be
determined
2 CHECK SPEAKERS
Check the installatio ...
