Power Seat Position Is Not Memorized

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): Power Seat Position is not Memorized
- Power Seat Position is not Memorized

DESCRIPTION

The main body ECU receives seat memory switch signals from the outer mirror control ECU (driver side) via CAN. If the 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 SET switch, the main body ECU sends a memory request signal to the front power seat switch LH. After receiving the request signal, the front power seat switch LH memorizes location data of each motor.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* The seat position will not be recorded if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
* If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Use the Techstream to check if the CAN communication system is functioning normally How to Proceed With Troubleshooting.

OK:

CAN communication DTC is not output.

NG -- GO TO CAN COMMUNICATION SYSTEM CAN Communication System
OK -- Continue to next step.

2. CHECK POWER SEAT CONTROL FUNCTION

(a) Check that each function of the power seat operates normally by using the front power seat switch LH Operation Check.

OK:

Each function of power seat operates normally by using front power seat switch LH.

NG -- GO TO OTHER FLOW CHART (Front Power Seat does not Operate with Front Power Seat Switch) Front Power Seat Does Not Operate With Front Power Seat Switch
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (MIRROR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Mirror L / Data List

(e) According to the display on the Techstream, read the Data List.

Mirror L





OK:

ON or OFF is displayed on the Techstream according to the table above.

NG -- INSPECT SEAT MEMORY SWITCH
OK -- Continue to next step.

4. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER SIDE)

(a) Replace the outer mirror control ECU assembly (driver side) Removal.

NEXT -- Continue to next step.

5. CHECK SEAT MEMORY FUNCTION (SEAT POSITION MEMORY FUNCTION)

(a) Perform a memory operation properly. Check that the buzzer sounds to indicate the completion of the memory operation Operation Check.

NOTICE:
* The seat position will not be recorded if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
* If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

OK:

Seat memory switch function operates normally.

NG -- REPLACE FRONT POWER SEAT SWITCH LH

OK -- END (OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER SIDE) WAS DEFECTIVE)

6. REPLACE FRONT POWER SEAT SWITCH LH

(a) Replace the front power seat switch LH Disassembly.

NEXT -- Continue to next step.

7. CHECK SEAT MEMORY SWITCH

(a) Perform a memory operation properly. Check that the buzzer sounds to indicate the completion of the memory operation Operation Check.

NOTICE:
* The seat position will not be recorded if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
* If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

OK:

Seat memory switch function operates normally.

NG -- REPLACE MAIN BODY ECU Removal

OK -- END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE)

8. INSPECT SEAT MEMORY SWITCH

(a) Remove the seat memory switch Removal.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





(c) Reinstall the seat memory switch.

NG -- REPLACE SEAT MEMORY SWITCH Removal
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU - SEAT MEMORY SWITCH)

(a) Disconnect the H3 outer mirror control ECU assembly LH connector.

(b) Disconnect the H7 seat memory switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(d) Reconnect the seat memory switch connector.

(e) Reconnect the outer mirror control ECU assembly LH connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE FRONT POWER SEAT SWITCH LH Disassembly