DESCRIPTION
When either the M1 or M2 switch is pressed, the outer mirror control ECU assembly LH sends a switch signal to the main body ECU (driver side junction block assembly) via CAN communication. Then, the main body ECU (driver side junction block assembly) sends a recall request signal to the position control ECU and switch assembly. The position control ECU and switch assembly operates each motor to achieve each memorized position value.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
The front power seat control system (w/ Memory) uses the CAN communication system.
First, confirm that there is no malfunction in the communication system by checking
communication function of the CAN communication system. Refer to the How to Proceed
with Troubleshooting procedure (See page ).
PROCEDURE
1. |
CHECK FRONT POWER SEAT CONTROL SYSTEM |
(a) Check that each function of the power seat operates normally by using the
switches on the position control ECU and switch assembly (See page
).
OK:
Each function of the power seat operates normally using the switches on the position control ECU and switch assembly.
NG | ![]() |
GO TO PROBLEM SYMPTOMS TABLE |
|
2. |
CHECK SEAT POSITION MEMORY FUNCTION |
(a) Store a seat position in memory and check that the buzzer sounds to indicate
that a position has been stored (See page ).
NOTICE:
OK:
Seat position memory function is normal.
NG | ![]() |
GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) |
|
3. |
CHECK SEAT POSITION RESTORING FUNCTION |
(a) Under each of the following conditions, check that the seat position restoring
function operates by pressing the M1 switch or M2 switch (See page
).
Result |
Proceed to |
---|---|
Seat position restoring function does not operate at all. |
A |
Seat position restoring function does not operate when the condition is *1. |
B |
|
C |
B | ![]() |
GO TO STEP 9 |
C | ![]() |
GO TO STEP 10 |
|
4. |
READ VALUE USING TECHSTREAM (SEAT POSITION MEMORY) |
(a) Store a seat position in memory for each of the M1 and M2 switches (See page
).
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Driver Seat / Data List.
(f) Read the Data List according to the display on the Techstream.
Driver Seat
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Seat Memory No1 |
Seat position memorized with M1 switch / Mem or Not Mem |
Mem: Memorized Not Mem: Not memorized |
- |
Seat Memory No2 |
Seat position memorized with M2 switch / Mem or Not Mem |
Mem: Memorized Not Mem: Not memorized |
- |
OK:
Mem appears on the Techstream screen.
NG | ![]() |
GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) |
|
5. |
REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH |
(a) Replace the outer mirror control ECU assembly LH (See page
).
|
6. |
CHECK SEAT POSITION RESTORING FUNCTION |
(a) Restore a memorized seat position (See page
).
(b) Check that the buzzer sounds for 0.1 seconds and the seat automatically moves to the memorized position.
NOTICE:
OK:
Seat position restoring function operates normally.
OK | ![]() |
END (OUTER MIRROR CONTROL ECU ASSEMBLY LH WAS DEFECTIVE) |
|
7. |
REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY |
(a) Replace the position control ECU and switch assembly (See page
).
|
8. |
CHECK SEAT POSITION RESTORING FUNCTION |
(a) Store a seat position in memory (See page
).
(b) Restore a memorized seat position (See page
).
(c) Check that the buzzer sounds for 0.1 seconds and the seat automatically moves to the memorized position.
NOTICE:
OK:
Seat position restoring function operates normally.
OK | ![]() |
END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE) |
NG | ![]() |
REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) |
9. |
READ VALUE USING TECHSTREAM (PARK (P) STATE) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Driver Seat / Data List.
(e) Read the Data List according to the display on the Techstream.
Driver Seat
Tester Connection |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
P Switch |
Park state signal / ON or OFF |
ON: Shift lever in P OFF: Shift lever in a position other than P |
- |
OK:
On the Techstream screen, the item changes between ON and OFF according to the above.
Result |
Proceed to |
---|---|
OK |
A |
NG (for 1AR-FE) |
B |
NG (for 2GR-FE) |
C |
A | ![]() |
REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY |
B | ![]() |
GO TO SFI SYSTEM (for 1AR-FE) |
C | ![]() |
GO TO SFI SYSTEM (for 2GR-FE) |
10. |
READ VALUE USING TECHSTREAM (DRIVER DOOR COURTESY SWITCH) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) Read the Data List according to the display on the Techstream.
Main Body
Tester Connection |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
D Door Courtesy SW |
Front door courtesy light switch assembly LH signal / ON or OFF |
ON: Driver door open OFF: Driver door closed |
- |
OK:
On the Techstream screen, the item changes between ON and OFF according to the above.
OK | ![]() |
REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY |
NG | ![]() |
GO TO LIGHTING SYSTEM (Door Courtesy Switch Circuit) |
Removal
REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the LH side and RH side.
The following procedure listed below is for the LH side.
PROCEDURE
1. REMOVE FRONT WHEEL
2. REMOVE FRONT WIPER ARM HEAD CAP
3. REMOVE FRONT WI ...
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)
(a) Disconnect the I13 connector.
(b) Measure the voltage and resistance according to the value(s) in the table
below.
HINT:
Measure the values on the wire harness side with the ...
Removal
REMOVAL
PROCEDURE
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-)
battery terminal to disable the SRS system.
NOTICE:
When disconnecting the cable, some systems ne ...