Lexus NX: Wireless Transmitter Memory Function does not Operate

Lexus NX Service Manual / Vehicle Interior / Seat / Front Power Seat Control System (w/ Memory) / Wireless Transmitter Memory Function does not Operate

DESCRIPTION

With the power switch on (IG) and the driver door closed, pressing the manual lock or unlock switch on the multiplex network master switch assembly while holding a seat memory switch (M1, M2 or M3 switch) will register the transmitter recognition code into the seat memory switch that was pressed. After registration is completed, the answer back buzzer sounds.

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 CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

  • The seat position will not be stored 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.

  • The seat will not return to the memorized position if 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.

    If a restoring operation has failed, release all switches. The seat memory restoring function does not operate unless the switches are released.

  • Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to the Smart Access System with Push-button Start (for Entry Function).

    Click here

PROCEDURE

1.

CHECK POWER DOOR LOCK CONTROL SYSTEM

(a) Check the manual lock/unlock function by using the door control switch (multiplex network master switch assembly).

Click here

OK:

Manual lock/unlock function operates normally.

NG

GO TO POWER DOOR LOCK CONTROL SYSTEM

OK

2.

CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function)

(a) Check that the smart access system with push-button start (for Start Function) is operated normally when the power switch is pressed while carrying the key and with the brake pedal depressed.

OK:

Push-button start starts normally.

NG

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function)

OK

3.

CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION

(a) Check the seat position memory and restoring function.

Click here

Result

Proceed to

OK

A

NG (seat position memory function does not operate normally)

B

NG (seat position restoring function does not operate normally)

C

B

GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized)

C

GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat does not Return to Memorized Position)

A

4.

READ VALUE USING TECHSTREAM (FL DOOR COURTESY SW)

(a) Connect the Techstream to the DLC3.

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

(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.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FL Door Courtesy SW

Front door courtesy light switch assembly LH signal

ON or OFF

ON: Driver door open

OFF: Driver door closed

-

Body Electrical > Main Body > Data List

Tester Display

FL Door Courtesy SW

OK:

The Techstream display changes correctly in response to the switch operation.

NG

GO TO LIGHTING SYSTEM (Door Courtesy Switch Circuit)

OK

5.

CHECK MEMORY CALL FUNCTION (MEMORY REGISTRATION)

(a) Check the memory registration of the memory call function.

Click here

OK:

Memory registration operates normally.

NG

GO TO STEP 8

OK

6.

READ VALUE USING TECHSTREAM (MEMORY CALL REGISTRATION)

(a) Connect the Techstream to the DLC3.

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

(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.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Mem SW No. w/KeyID1

Memory switch linked with key ID1

NONE, MEM SW1, MEM SW2 or MEM SW3

NONE: No switches linked with key ID1

MEM SW1: M1 switch linked with key ID1

MEM SW2: M2 switch linked with key ID1

MEM SW3: M3 switch linked with key ID1

-

Mem SW No. w/KeyID2

Memory switch linked with key ID2

NONE, MEM SW1, MEM SW2 or MEM SW3

NONE: No switches linked with key ID2

MEM SW1: M1 switch linked with key ID2

MEM SW2: M2 switch linked with key ID2

MEM SW3: M3 switch linked with key ID2

-

Mem SW No. w/KeyID3

Memory switch linked with key ID3

NONE, MEM SW1, MEM SW2 or MEM SW3

NONE: No switches linked with key ID3

MEM SW1: M1 switch linked with key ID3

MEM SW2: M2 switch linked with key ID3

MEM SW3: M3 switch linked with key ID3

-

Mem SW No. w/KeyID4

Memory switch linked with key ID4

NONE, MEM SW1, MEM SW2 or MEM SW3

NONE: No switches linked with key ID4

MEM SW1: M1 switch linked with key ID4

MEM SW2: M2 switch linked with key ID4

MEM SW3: M3 switch linked with key ID4

-

Mem SW No. w/KeyID5

Memory switch linked with key ID5

NONE, MEM SW1, MEM SW2 or MEM SW3

NONE: No switches linked with key ID5

MEM SW1: M1 switch linked with key ID5

MEM SW2: M2 switch linked with key ID5

MEM SW3: M3 switch linked with key ID5

-

Mem SW No. w/KeyID6

Memory switch linked with key ID6

NONE, MEM SW1, MEM SW2 or MEM SW3

NONE: No switches linked with key ID6

MEM SW1: M1 switch linked with key ID6

MEM SW2: M2 switch linked with key ID6

MEM SW3: M3 switch linked with key ID6

-

Mem SW No. w/KeyID7

Memory switch linked with key ID7

NONE, MEM SW1, MEM SW2 or MEM SW3

NONE: No switches linked with key ID7

MEM SW1: M1 switch linked with key ID7

MEM SW2: M2 switch linked with key ID7

MEM SW3: M3 switch linked with key ID7

-

Body Electrical > Main Body > Data List

Tester Display

Mem SW No. w/KeyID1

Mem SW No. w/KeyID2

Mem SW No. w/KeyID3

Mem SW No. w/KeyID4

Mem SW No. w/KeyID5

Mem SW No. w/KeyID6

Mem SW No. w/KeyID7

OK:

On the Techstream display, it is confirmed that the memory call has been registered.

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

OK

7.

CHECK MEMORY CALL FUNCTION (MEMORY REGISTRATION AND AUTOMATIC MEMORY CALL FUNCTION)

(a) Check the memory registration and automatic memory call function of the memory call function.

Click here

OK:

Memory registration and automatic memory call function operate normally.

OK

USE SIMULATION METHOD TO CHECK

NG

GO TO OTHER DIAGNOSIS PROCEDURE (Wireless-linked Return Function does not Operate)

8.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Replace the main body ECU (multiplex network body ECU) with a new one.

Click here

NEXT

9.

CHECK MEMORY CALL FUNCTION (MEMORY REGISTRATION)

(a) Check the memory registration of the memory call function.

Click here

OK:

Memory registration operates normally.

OK

END (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] WAS DEFECTIVE)

NG

10.

REPLACE FRONT POWER SEAT SWITCH LH

(a) Replace the front power seat switch LH with a new or known good one.

Click here

NEXT

11.

CHECK MEMORY CALL FUNCTION (MEMORY REGISTRATION)

(a) Check the memory registration of the memory call function.

Click here

OK:

Memory registration operates normally.

OK

END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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