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- Seat position restoring function does not operate when the condition is *2.
- Seat position restoring function does not operate when the condition is *3.
Lexus NX: Power Seat does not Return to Memorized Position
Lexus NX Service Manual / Vehicle Interior / Seat / Front Power Seat Control System (w/ Memory) / Power Seat does not Return to Memorized Position
DESCRIPTION
When either the M1, M2 or M3 switch is pressed, the outer mirror control ECU assembly (for Driver Side) sends a switch signal to the main body ECU (multiplex network body ECU) via CAN communication. Then, the main body ECU (multiplex network body ECU) sends a recall request signal to the front power seat switch LH. The front power seat switch LH operates each motor to achieve each memorized position value.
WIRING DIAGRAM
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CAUTION / NOTICE / HINT
NOTICE:
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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.
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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.
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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.
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Before replacing the main body ECU (multiplex network body ECU), refer to the Smart Access System with Push-button Start (for Entry Function).
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PROCEDURE
| 1. | CHECK FRONT POWER SEAT OPERATION |
(a) Check that each function of the power seat operates normally by using the front power seat switch LH.
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OK:
Each function of the power seat operates normally using the front power seat switch LH.
| NG | .gif) | GO TO PROBLEM SYMPTOMS TABLE |
|
| 2. | CHECK SEAT POSITION MEMORY FUNCTION |
(a) Check that the seat position memory function.
Click here
OK:
Seat position memory function is normal.
| NG | | GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) |
|
| 3. | CHECK SEAT POSITION RESTORING FUNCTION |
(a) Under each of the following conditions, check that the seat position restoring function operates by pressing the M1, M2 or M3 switch.
Click here
- The power switch is on (IG), and the shift lever is in P.*1
- The power switch is turned off within 180 seconds after the driver door is closed and opened.*2
- The power switch is turned off within 60 seconds after the driver door is opened and closed.*3
| Result | Proceed to |
|---|---|
| Seat position restoring function does not operate at all. | A |
| Seat position restoring function does not operate when the condition is *1. | B |
| | C |
| B | | GO TO STEP 7 |
| C | | GO TO STEP 8 |
|
| 4. | READ VALUE USING TECHSTREAM (SEAT MEMORY NO1, SEAT MEMORY NO2, SEAT MEMORY NO3) |
(a) Store a seat position in memory for each of the M1, M2 and M3 switches.
Click here
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Driver Seat / Data List.
(f) 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:
Mem appears on the Techstream screen.
| NG | | GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized) |
|
| 5. | REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (for Driver Side) |
(a) Replace the outer mirror control ECU assembly (for Driver Side) with a new or known good one.
Click here
|
| 6. | CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION |
(a) Check that the seat position memory and restoring function.
Click here
OK:
Seat position memory and restoring function operates normally.
| OK | | END (OUTER MIRROR CONTROL ECU ASSEMBLY [for Driver Side] WAS DEFECTIVE) |
| NG | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| 7. | READ VALUE USING TECHSTREAM (P 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 / Driver Seat / Data List.
(e) 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 |
|---|---|---|---|---|
| P Switch | Park state signal | ON or OFF | ON: Shift lever in P OFF: Shift lever in a position other than P | - |
| Tester Display |
|---|
| P Switch |
OK:
The Techstream display changes correctly in response to the switch operation.
| OK | | REPLACE FRONT POWER SEAT SWITCH LH |
| NG | | GO TO HYBRID CONTROL SYSTEM |
| 8. | 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 | - |
| Tester Display |
|---|
| FL Door Courtesy SW |
OK:
The Techstream display changes correctly in response to the switch operation.
| OK | | REPLACE FRONT POWER SEAT SWITCH LH |
| NG | | GO TO LIGHTING SYSTEM (Door Courtesy Switch Circuit) |
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