Toyota Sienna Service Manual: Driving Position Memory Switch Circuit (w/ Memory)
DESCRIPTION
The seat memory switch sends signals to the outer mirror control ECU LH via the multiplex communication system to memorize a given seat position. This memory system does not use a position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The seat memory switch is later used to send signals to the front power seat switch to return the seat to one of the memorized positions.
The power seat memory operation can be performed only when the ignition switch is on and the shift lever is in the P position.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 READ VALUE OF INTELLIGENT TESTER
- Connect the intelligent tester (with CAN VIM) to the DLC3.
- Turn the ignition switch on.
- Read the DATA LIST.
D_SEAT (Position control ECU and switch assembly)
OK: Condition status can be displayed.
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2 INSPECT SEAT MEMORY SWITCH (DRIVING POSITION MEMORY SWITCH)
- Remove the seat memory switch.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
3 CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH CIRCUIT)
- Measure the voltage according to the value(s) in the table below.
Standard voltage
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
4 CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU LH - SEAT MEMORY SWITCH)
- Disconnect outer mirror control ECU LH connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
REPLACE OUTER MIRROR CONTROL ECU LH
Power Seat Motor Circuit
DESCRIPTION
When the power seat control switch is operated, a command signal is sent to
the position control ECU
and switch assembly (power seat control switch and ECU). The front power seat
swi ...
ECU Power Source Circuit
DESCRIPTION
The position control ECU and switch assembly (power seat control switch and
ECU) is contained in the
switch assembly.
During manual operation, only one switch signal is accepted. If ...
Other materials:
Inspection
1. INSPECT VENTILATION VALVE
(a) Install a clean hose to the ventilation valve.
(b) Check the ventilation valve operation.
(1) Blow air into the cylinder head side, and check
that air passes through easily.
NOTICE:
Do not suck air through the valve.
Petroleum substances i ...
Engine oil
With the engine at operating temperature and turned off, check the oil
level on the dipstick.
Checking the engine oil
Park the vehicle on level ground. After warming up the engine
and turning it off, wait more than 5 minutes for the oil to drain
back into the bottom of the engine.
Ho ...
Installation
1. INSTALL SEAT POSITION AIRBAG SENSOR
Check that the ignition switch is off.
Check that the negative battery (-) terminal is
disconnected.
CAUTION:
After disconnecting the negative battery
terminal, wait for at least 90 seconds before
starting the operation.
Usin ...
