Lexus NX: Wireless-linked Return Function does not Operate
DESCRIPTION
When a door is unlocked using the wireless unlock function, the certification ECU (smart key ECU assembly) sends a key ID signal to the main body ECU (multiplex network body ECU). When a door is unlocked using the entry unlock function, the certification ECU (smart key ECU assembly) sends a door unlock signal and key ID signal to the main body ECU (multiplex network body ECU). When the main body ECU (multiplex network body ECU) receives the door unlock signal, it stores the key ID. When the driver door is opened, the memory call and memory command information of the stored key ID is sent to each driving position related control ECU. Each control ECU receives the memory commands and performs the memory call operation according to predetermined control timing values.
CAUTION / NOTICE / HINT
NOTICE:
-
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.
-
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
.gif)
PROCEDURE
| 1. | CHECK FRONT POWER SEAT OPERATION |
(a) Check the operation of the power seats.
Click here
(b) Check whether seat positions can be stored in memory.
Click here
(c) Check whether seat positions can be restored.
Click here
(d) Check the operation of memory call registration.
Click here
| Result | Proceed to |
|---|---|
| OK | A |
| NG (power seat operation) | B |
| NG (seat position memory) | C |
| NG (seat position restoring) | D |
| NG (memory call registration) | E |
| B | .gif) | GO TO PROBLEM SYMPTOMS TABLE |
| C | | GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) |
| D | | GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat does not Return to Memorized Position) |
| E | | GO TO OTHER DIAGNOSIS PROCEDURE (Wireless Transmitter Memory Function does not Operate) |
|
.gif)
| 2. | 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
| Result | Proceed to |
|---|---|
| Memory call function linked with the wireless unlock function does not operate. | A |
| Memory call function linked with the entry unlock function does not operate. | B |
| Both memory call function linked with the wireless unlock function and entry unlock function do not operate. | C |
| B | | GO TO STEP 9 |
| C | | GO TO STEP 15 |
|
| 3. | CHECK WIRELESS DOOR LOCK CONTROL SYSTEM |
(a) Check the wireless unlock function of the wireless door lock control system.
Click here
OK:
Wireless unlock function is normal.
| NG | | GO TO WIRELESS DOOR LOCK CONTROL SYSTEM |
|
| 4. | CHECK MEMORY CALL FUNCTION (POWER TILT AND TELESCOPIC OPERATION) |
(a) Using the memory call function, check the power tilt and telescopic operation.
Click here
| Result | Proceed to |
|---|---|
| Power tilt and telescopic operate normally | A |
| Power tilt and telescopic do not operate normally | B |
| B | | GO TO STEP 7 |
|
| 5. | REPLACE FRONT POWER SEAT SWITCH LH |
(a) Replace the front power seat switch LH with a new or known good one.
Click here
|
| 6. | 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 call function linked with the wireless unlock function operates normally.
| OK | | END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 7. | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
(a) Replace the main body ECU (multiplex network body ECU) with a new one.
Click here
|
| 8. | 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 call function linked with the wireless unlock function operates normally.
| OK | | END (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] WAS DEFECTIVE) |
| NG | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| 9. | CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) |
(a) Check the entry unlock function of the smart access system with push-button start (for Entry Function).
Click here
OK:
Entry unlock function is normal.
| NG | | GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) |
|
| 10. | CHECK MEMORY CALL FUNCTION (POWER TILT AND TELESCOPIC OPERATION) |
(a) Using the memory call function, check the power tilt and telescopic operation.
Click here
| Result | Proceed to |
|---|---|
| Power tilt and telescopic operate normally | A |
| Power tilt and telescopic do not operate normally | B |
| B | | GO TO STEP 13 |
|
| 11. | REPLACE FRONT POWER SEAT SWITCH LH |
(a) Replace the front power seat switch LH with a new or known good one.
Click here
|
| 12. | 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 call function linked with the entry unlock function operates normally.
| OK | | END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 13. | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
(a) Replace the main body ECU (multiplex network body ECU) with a new one.
Click here
|
| 14. | 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 call function linked with the entry unlock function operates normally.
| OK | | END (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] WAS DEFECTIVE) |
| NG | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| 15. | CHECK MEMORY CALL FUNCTION (POWER TILT AND TELESCOPIC OPERATION) |
(a) Use the memory call function and check the power tilt and telescopic operation.
Click here
| Result | Proceed to |
|---|---|
| Power tilt and telescopic operate normally | A |
| Power tilt and telescopic do not operate normally | B |
| B | | GO TO STEP 18 |
|
| 16. | REPLACE FRONT POWER SEAT SWITCH LH |
(a) Replace the front power seat switch LH with a new or known good one.
Click here
|
| 17. | 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 call function linked with the wireless unlock and entry unlock function operate normally.
| OK | | END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 18. | 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 | - |
| 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 |
(f) Enter the following menus: Body Electrical / Driver Seat / Data List.
(g) Read the Data List according to the display on the Techstream.
Body Electrical > Driver Seat > Data List| 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 | - |
| Seat Memory No3 | Seat position memorized with M3 switch | Mem or Not Mem | Mem: Memorized Not Mem: Not memorized | - |
| Tester Display |
|---|
| Seat Memory No1 |
| Seat Memory No2 |
| Seat Memory No3 |
OK:
On the Techstream display, it is confirmed that the memory switch which is linked with a key ID has a memorized seat position. (For example, on the Techstream display, "Mem SW No. w/KeyID1" displays "MEM SW1" and "Seat Memory No1" displays "Mem".)
| NG | | PERFORM MEMORY CALL REGISTRATION |
|
| 19. | READ VALUE USING TECHSTREAM (DRIVER DOOR COURTESY SWITCH) |
(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 | - |
| Tester Display |
|---|
| FL Door Courtesy SW |
OK:
On the Techstream screen, each item changes between ON and OFF according to the above.
| NG | | GO TO LIGHTING SYSTEM (Front Door Courtesy Switch Circuit) |
|
| 20. | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
(a) Replace the main body ECU (multiplex network body ECU) with a new one.
Click here
|
| 21. | 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 call function linked with the wireless unlock and entry unlock function operate normally.
| OK | | END (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] WAS DEFECTIVE) |
| NG | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
READ NEXT:
Power Seat Power Easy Access System Function does not Operate
DESCRIPTION
The seat slides backward when either of the following conditions is met:
The driver seat belt is unfastened with the power switch off and the shift lever in P.
The power switch is
Parts Location
PARTS LOCATION ILLUSTRATION *1 NO. 2 ENGINE ROOM RELAY BLOCK
- P/SEAT F/R FUSE
*2 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
- P/SEAT F/L FUSE
ILLUSTRATION *A for Driver S
SEE MORE:
Outside Air Temperature Sensor (C1652)
DESCRIPTION When a malfunction signal sent from the air conditioning system via CAN communication is detected by the clearance warning ECU assembly, DTC C1652 is stored. DTC No. Detection Item DTC Detection Condition Trouble Area C1652 Outside Air Temperature Sensor Ambient temperat
Components
COMPONENTS ILLUSTRATION *1 INSTRUMENT SIDE PANEL LH *2 NO. 1 INSTRUMENT PANEL SAFETY PAD SUB-ASSEMBLY *3 TRIP SWITCH - -
