Toyota Sienna Service Manual: System description
1. GENERAL DESCRIPTION
- The power seat control system is equipped with the following function:
- The front seats are equipped with electric adjuster slide, reclining, lifter, front vertical and lumbar support adjustment functions.
- The power seat control system (w/ memory) is equipped with the following functions:
- Individual seat positions for two different drivers can be stored for the slide, reclining, front vertical and lifter.
- Similarly, power mirror positions for two different drivers can be stored. These are stored/restored together with the seat positions by pushing the seat memory switch.
- The above operations are performed using the multiplex communication system.
- As a safety precaution, the system does not allow seat position restoration unless the ignition switch is in the ON position and the shift lever is in the P position.
- Manual adjustment of the lumbar support
function can be performed even when the
position control ECU and switch assembly
(power seat control switch and ECU) is not
functional.
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 position control ECU and switch assembly (power seat control switch and ECU) then activates the appropriate seat motor as needed.
This memory system does not use a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns. The position control ECU and switch assembly (power seat control switch and ECU) is designed so that a malfunction of the seat memory system will not interfere with seat control. The seat memory switch also sends signals to the position control ECU and switch assembly (power seat control switch and ECU) to memorize a given seat position. Two seat positions can be memorized. The seat memory switch is later used to send signals to the position control ECU and switch assembly (power seat control switch and ECU) to return the seat to either of the memorized positions.
2. FUNCTION OF MAIN COMPONENT (w/ MEMORY)
- The following functions are available.
|
Components |
Function |
| Seat slide motor | Slides the driver side seat back and forth based on signals from the position control ECU and switch assembly (power seat control switch and ECU). |
| Seat reclining motor | Reclines the driver side seat back and forth based on signals from the position control ECU and switch assembly (power seat control switch and ECU). |
| Seat front vertical motor | Moves the front part of the driver side seat cushion up and down based on signals from the position control ECU and switch assembly (power seat control switch and ECU). |
| Seat lifter motor | Moves the driver side seat cushion up and down based on signals from the position control ECU and switch assembly (power seat control switch and ECU). This motor operates, and driver side seat rear vertical raises and lowers, and driver side seat rear vertical raises and lowers. |
| Set switch Memory switch | When the set and memory switches are pressed simultaneously, SET, 1
or 2 switch signal is input to the
power window regulator switch assembly (power window master switch) and
sends the seat memory
switch signal via the multiplex communication system.
When only the memory switch is pressed, SET, 1 or 2 switch signal is input to power window regulator switch assembly (power window master switch) and driver side seat position changes according to memory. |
| Lumbar support adjuster motor | Receives signal from lumber front power seat switch, motor operates, and lumber support can be adjusted |
| Front power seat switch (reclining, lifter, slide, front vertical) | Based on switches operated, seat adjuster signals are input into position control ECU and seat is adjusted accordingly |
| Lumbar front power seat switch | Based on switches operated, seat is adjusted accordingly |
3. SYSTEM OPERATION
- The front power seats adjustment and position memory are shown in the chart below
*: with Seat Position Memory System In the memory function, the memory switch operation signal is transferred from the outer mirror control ECU LH to the position control ECU and switch assembly (power seat control switch and ECU) via the multiplex communication line. Then, either the seat position is stored in memory or the previously stored seat position is recalled to set the appropriate seat position.
Precaution
1. GENERAL PRECAUTION
When using the battery during inspection, do not
bring the positive and negative tester probes too
close to each other as a short circuit may occur.
PARTS LOCATI ...
How to proceed with
troubleshooting
HINT:
Use this procedure to troubleshoot the front power seat
control system.
The intelligent tester should be used in steps 3 and 5.
1 VEHICLE BROUGHT TO WORKSHOP
2 CUSTOMER P ...
Other materials:
Removal
1. REMOVE BATTERY
2. REMOVE AIR CLEANER ASSEMBLY
HINT:
(See page EM-26)
3. SEPARATE TRANSMISSION CONTROL CABLE ASSEMBLY
(a) Remove the nut from the control shaft lever.
(b) Disconnect the control cable from the control shaft
lever.
(c) Remove the clip and disconnect the control cab ...
Center Airbag Sensor Assembly Malfunction
DTC B1100/31 Center Airbag Sensor Assembly Malfunction
DESCRIPTION
The center airbag sensor assembly consists of the center airbag sensor
assembly, safing sensor, drive
circuit, diagnosis circuit and ignition control, etc.
It receives signals from the airbag sensor, judges whether or not the ...
Customer problem analysis
HINT:
In troubleshooting, confirm that the problem symptoms
have been accurately identified. Preconceptions should be
discarded in order to make an accurate judgment. To
clearly understand what the problem symptoms are, it is
extremely important to ask the customer about the
problem an ...