Toyota Sequoia (2005). Manual — part 427
DIDDZ–01
I28552
Position Control ECU
& Switch Assy
Park/Neutral
Position Switch
Combination
Meter
Power Seat Motor
Driver Side (Reclining)
Power Seat Motor
Driver Side (Slide)
Power Seat Motor
Driver Side (Front Vertical)
Power Seat Motor
Driver Side (Lifter)
Front Door Courtesy
Light Switch Assy
Seat Memory Switch
Lumbar
Support
Control
Motor
Lumbar Support
Control Switch
To Battery
To Battery
To Ignition Switch
ECU–B
PWR SEAT
ECU–IG
SYSB
IG
+B
RCL+
RCL–
LFT+
LFT–
FRV+
FRV–
SLD+
SLD–
SW1
SW2
MMRY
DCTY
Key Unlock
Warning Switch
KSW
Body ECU
BEAN
To Ignition Switch
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
DI–1503
1697
SYSTEM DIAGRAM
DIDE0–01
DI–1504
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1698
SYSTEM DESCRIPTION
The power seat control system (w/ memory) is equipped with the following functions:
Manual operation of the driver side seat.
Individual seat positions for two different drivers can be stored for the slide–reclining front–verti-
cal 8–way lifter.
Similarly, power mirror positions for two different drivers can be stored. These are stored/restored
with the seat positions.
The above operations are performed using serial communication.
As a safety precaution, the system disallows seat position restoration unless the ignition switch
is ON, and the park/neutral position switch is in the P (park) position.
Manual adjustment of the slide reclining lumbar can be performed even when the ECU is not
functional.
When the power seat control switch is operated, a command signal is sent to the position control ECU. The
position control 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. If there is no pulse output from the motor, the motor will stop operating. The ECU is designed so that
a malfunction of the seat memory system will not interfere with manual seat control. The seat memory switch
also sends signals to the position control ECU to memorize a given seat position. The seat memory switch
is later used to send signals to the position control ECU to return to one of the memorized positions.
DIDE1–01
–
DIAGNOSTICS
POWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
DI–1505
1699
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
Use this procedure to troubleshoot the front power seat control system with memory function.
1
Vehicle Brought To Workshop
NEXT
2
Customer Problem Analysis Check and Problem Symptom Check
(See page
NEXT
3
Problem Symptom Confirmation
Symptom Does Not Occur (Go to step 4)
Symptom Occurs (Go to step 5)
4
)
NEXT
5
Check Multiplex Communication System (See page
Check if any DTCs are output.
HINT:
The position control ECU & switch assy of this system are connected to the multiplex communication system.
Therefore, before starting troubleshooting, make sure to check that there is no trouble in the multiplex com-
munication system.
Multiplex System DTC is Output (Proceed to
”Multiplex Communication System”)
No Multiplex System DTC (Go to step 6)
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