Lexus NX: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| No functions operate. | Operation check | |
| Initialization | | |
| Proceed to "Power Source Circuit" | | |
| Fold seat control ECU | | |
| Fold/Return functions do not operate using the rear power seat switch. | Operation check | |
| Proceed to "Park / Neutral Position Switch Circuit" | | |
| Proceed to "Rear Power Seat Switch Circuit" | | |
| Proceed to "Rear Door Courtesy Switch Circuit" | | |
| Proceed to "Folding Motor Circuit" | | |
| Fold/Return functions do not operate using the No. 1 fold seat switch assembly. | Operation check | |
| Proceed to "Park/Neutral Position Switch Circuit" | | |
| Proceed to "Fold Seat Switch Circuit" | | |
| Proceed to "Folding Motor Circuit" | | |
| Fold/Return functions do not operate using the No. 2 fold seat switch assembly. | Operation check | |
| Proceed to "Park/Neutral Position Switch Circuit" | | |
| Proceed to "Fold Seat Switch Circuit" | | |
| Proceed to "Back Door Courtesy Switch Circuit" | | |
| Proceed to "Folding Motor Circuit" | | |
| Reclining function does not operation. | Operation check | |
| Proceed to "Fold Seat Switch Circuit" | | |
| Proceed to "Reclining Motor Circuit" | | |
| Fold seat control ECU | | |
| Buzzer sounds continuously while power switch is on (IG) and seat does not operate. | Operation check | |
| Initialization | | |
| Proceed to "Power Source Circuit" | | |
| Fold seat control ECU | | |
| Seat only operates partway. | Operation check | |
| Initialization | | |
| Proceed to "Reclining Motor Circuit" | | |
| Proceed to "Folding Motor Circuit" | |
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Terminals Of Ecu
TERMINALS OF ECU CHECK FOLD SEAT CONTROL ECU (REAR RIGHT SEAT) (a) Disconnect the h3 and h4 fold seat control ECU (rear right seat) connectors. (b) Measure the resistance and voltage according to the
Park / Neutral Position Switch Circuit
DESCRIPTION The fold seat control ECU receives switch operation signals, back door open/close signal*1, rear door open/close signal*2 and driving condition signal (shift position, stop light switch as
Rear Door Courtesy Switch Circuit
DESCRIPTION The fold seat control ECU receives the switch operation signal, driving condition signal and rear door open/close signal. Then the fold seat control ECU actives the rear seat according to
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Components
COMPONENTS ILLUSTRATION *A for Driver Side *B for Front Passenger Side *1 FRONT DOOR INSIDE HANDLE BEZEL PLUG LH *2 FRONT DOOR TRIM BOARD SUB-ASSEMBLY LH *3 FRONT DOOR TRIM COVER LH *4 POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY WITH FRONT DOOR ARMREST BASE PANEL
Installation
INSTALLATION CAUTION / NOTICE / HINT HINT: A bolt without a torque specification is shown in the standard bolt chart. Click here PROCEDURE 1. INSTALL LOWER INSTRUMENT PANEL SUB-ASSEMBLY (a) Cut off both ends at the positions shown in the illustration (runner) (when installing new part). *a C
