DESCRIPTION
The main body ECU (driver side junction block assembly) receives seat memory switch signals from the outer mirror control ECU assembly LH via CAN communication. If the seat memory SET switch is being pressed when one of the M1 or M2 switches is pressed, or if one of the M1 or M2 switches is pressed within 3 seconds of pressing the seat memory SET switch, the main body ECU (driver side junction block assembly) sends a memory request signal to the position control ECU and switch assembly. After receiving the request signal, the position control ECU and switch assembly memorizes the location data of each motor.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK FRONT POWER SEAT CONTROL SYSTEM |
(a) Check that each function of the power seat operates normally by using the
position control ECU and switch assembly (See page
).
OK:
Each function of the power seat operates normally using the position control ECU and switch assembly.
NG | ![]() |
GO TO PROBLEM SYMPTOMS TABLE |
|
2. |
READ VALUE USING TECHSTREAM (SEAT MEMORY 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 / Mirror L / Data List
(e) Read the Data List according to the display on the Techstream.
Mirror L
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Seat Memory Switch1 |
M1 switch / ON or OFF |
ON: M1 switch on OFF: M1 switch off |
- |
Seat Memory Switch2 |
M2 switch / ON or OFF |
ON: M2 switch on OFF: M2 switch off |
- |
Seat Memory Set SW |
SET switch / ON or OFF |
ON: SET switch on OFF: SET switch off |
- |
OK:
ON or OFF is displayed on the Techstream according to the table above.
NG | ![]() |
GO TO STEP 8 |
|
3. |
PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER) |
(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 Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Buzzer |
Buzzer operation |
OFF/ON |
- |
OK:
Buzzer sounds normally.
NG | ![]() |
REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY |
|
4. |
REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH |
(a) Replace the outer mirror control ECU assembly LH (See page
).
|
5. |
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 operates normally.
OK | ![]() |
END (OUTER MIRROR CONTROL ECU ASSEMBLY LH WAS DEFECTIVE) |
|
6. |
REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY |
(a) Replace the position control ECU and switch assembly (See page
).
|
7. |
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 operates normally.
OK | ![]() |
END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE) |
NG | ![]() |
REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) |
8. |
INSPECT SEAT MEMORY SWITCH |
(a) Remove the seat memory switch (See page
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1 - 2 |
SET switch is pressed |
Below 1 Ω |
SET switch is not pressed |
10 kΩ or higher |
|
1 - 4 |
M1 switch is pressed |
Below 1 Ω |
M1 switch is not pressed |
10 kΩ or higher |
|
1 - 3 |
M2 switch is pressed |
Below 1 Ω |
M2 switch is not pressed |
10 kΩ or higher |
*1 |
M1 Switch |
*2 |
M2 Switch |
*3 |
SET Switch |
*a |
Component without harness connected (Seat Memory Switch) |
NG | ![]() |
REPLACE SEAT MEMORY SWITCH |
|
9. |
CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY LH - SEAT MEMORY SWITCH) |
(a) Disconnect the I13 outer mirror control ECU assembly LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
I10-2 (MRY) - I13-1 (MM) |
Always |
Below 1 Ω |
I10-4 (M1) - I13-2 (M1) |
Always |
Below 1 Ω |
I10-3 (M2) - I13-3 (M2) |
Always |
Below 1 Ω |
I10-1 (U) - I13-13 (MSWE) |
Always |
Below 1 Ω |
I13-7 (GND) - Body ground |
Always |
Below 1 Ω |
I13-1 (MM) - Body ground |
Always |
10 kΩ or higher |
I13-2 (M1) - Body ground |
Always |
10 kΩ or higher |
I13-3 (M2) - Body ground |
Always |
10 kΩ or higher |
I13-13 (MSWE) - Body ground |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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