Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: 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 information and then 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 of the switches. The seat memory function will 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 Registration.
PROCEDURE
| 1. | CHECK FRONT POWER SEAT OPERATION |
(a) Check the operation of the power seats.
Click here .gif)
(b) Check the seat position memory function.
Click here
(c) Check the seat position restoration function.
Click here
(d) Check the operation of memory registration of the memory call function.
Click here
| Result | Proceed to |
|---|---|
| OK | A |
| NG (power seat operation) | B |
| NG (seat position memory function) | C |
| NG (seat position restoration function) | D |
| NG (memory 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) |
|
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| 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 |
| Memory call function linked with the wireless unlock function and entry unlock function both 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 (MIRROR OPERATION) |
(a) Check the operation of the outer mirrors using the memory call function.
Click here
| Result | Proceed to |
|---|---|
| Outer mirrors operate normally | A |
| Outer mirrors do not operate normally | B |
| B | | GO TO STEP 7 |
|
| 5. | REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH |
(a) Replace the position control ECU and switch assembly 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 (POSITION CONTROL ECU AND SWITCH ASSEMBLY 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 or known good 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 (MIRROR OPERATION) |
(a) Check the operation of the outer mirrors using the memory call function.
Click here
| Result | Proceed to |
|---|---|
| Outer mirrors operate normally | A |
| Outer mirrors do not operate normally | B |
| B | | GO TO STEP 13 |
|
| 11. | REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH |
(a) Replace the position control ECU and switch assembly 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 (POSITION CONTROL ECU AND SWITCH ASSEMBLY 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 or known good 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 (MIRROR OPERATION) |
(a) Check the operation of the outer mirrors using the memory call function.
Click here
| Result | Proceed to |
|---|---|
| Outer mirrors operate normally | A |
| Outer mirrors do not operate normally | B |
| B | | GO TO STEP 18 |
|
| 16. | REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH |
(a) Replace the position control ECU and switch assembly 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 (POSITION CONTROL ECU AND SWITCH ASSEMBLY 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 engine 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:
A seat position has been memorized for the seat position memory switch linked to the electrical key transmitter sub-assembly. (For example, the value of "Mem SW No. w/KeyID1" is MEM SW1 and the value of "Seat Memory No1" is 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 engine 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 (driver door) signal | ON or OFF | ON: Driver door open OFF: Driver door closed | - |
| Tester Display |
|---|
| FL Door Courtesy SW |
OK:
On the Techstream screen, ON or OFF is displayed accordingly.
| NG | | GO TO LIGHTING SYSTEM (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 or known good 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 functions linked with the wireless unlock function 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) |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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