Tech Tips
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.
Note
If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.
As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in How to Proceed with Troubleshooting to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.
| Symptom | Suspected Area | Link |
|---|---|---|
| No functions operate | Proceed to "Power Source Circuit" |
| Symptom | Suspected Area | Link |
|---|---|---|
| Reclining function does not operate using the rear power seat switch LH (for Rear LH Side) | Rear power seat switch LH | |
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Reclining function operates slowly (for Rear LH Side) | No. 1 seatback frame sub-assembly LH (reclining motor LH [inner side]) | |
| No. 1 seatback frame sub-assembly LH (reclining motor LH [outer side]) | ||
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Buzzer sounds intermittently during reclining function operation by manual operation (for Rear LH Side) | Harness or connector | - |
| No. 1 seatback frame sub-assembly LH | ||
| Position control ECU assembly LH | ||
| Reclining function does not operate (for Rear LH Side) | Harness or connector | - |
| Position control ECU assembly LH | ||
| Reclining function does not operate using the rear power seat switch RH (for Rear RH Side) | Rear power seat switch RH | |
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Reclining function operates slowly (for Rear RH Side) | No. 1 seatback frame sub-assembly RH (reclining motor RH [inner side]) | |
| No. 1 seatback frame sub-assembly RH (reclining motor RH [outer side]) | ||
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Buzzer sounds intermittently during reclining function operation by manual operation (for Rear RH Side) | Harness or connector | - |
| No. 1 seatback frame sub-assembly RH | ||
| Position control ECU assembly RH | ||
| Reclining function does not operate (for Rear RH Side) | Harness or connector | - |
| Position control ECU assembly RH |
| Symptom | Suspected Area | Link |
|---|---|---|
| Ottoman function does not operate using the rear power seat switch LH (for Rear LH Side) | Rear power seat switch LH | |
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Ottoman function (open/close) does not operate (for Rear LH Side) | Rear lower inner reclining adjuster arm sub-assembly LH (ottoman motor LH [open/close]) | |
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Ottoman function (expansion/contraction) does not operate (for Rear LH Side) | Rear lower inner reclining adjuster arm sub-assembly LH (ottoman motor LH [expansion/contraction]) | |
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Buzzer sounds intermittently during ottoman function operation by manual operation (for Rear LH Side) | Harness or connector | - |
| Rear lower inner reclining adjuster arm sub-assembly LH | ||
| Position control ECU assembly LH | ||
| Ottoman function does not operate (for Rear LH Side) | Harness or connector | - |
| Position control ECU assembly LH | ||
| Ottoman function does not operate using the rear power seat switch RH (for Rear RH Side) | Rear power seat switch RH | |
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Ottoman function (open/close) function does not operate (for Rear RH Side) | Rear lower inner reclining adjuster arm sub-assembly RH (ottoman motor RH [open/close]) | |
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Ottoman function (expansion/contraction) does not operate (for Rear RH Side) | Rear lower inner reclining adjuster arm sub-assembly RH (ottoman motor RH [expansion/contraction]) | |
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Buzzer sounds intermittently during ottoman function operation by manual operation (for Rear RH Side) | Harness or connector | - |
| Rear lower inner reclining adjuster arm sub-assembly RH | ||
| Position control ECU assembly RH | ||
| Ottoman function does not operate (for Rear RH Side) | Harness or connector | - |
| Position control ECU assembly RH |
| Symptom | Suspected Area | Link |
|---|---|---|
| Slide lock release function does not operate (for Rear LH Side)* | Rear seat lock open lever sub-assembly LH | |
| Power seat motor assembly LH | ||
| Rear No. 1 seat lock cable assembly LH | ||
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| After slide lock release function operates (during slide lock operation), buzzer operates (for Rear LH Side) | Power seat motor assembly LH | |
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Buzzer sounds when the engine switch is turned on (IG) (for Rear LH Side) | Seat position initialization | |
| Power seat motor assembly LH | ||
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Slide lock release function does not operate (for Rear RH Side)* | Rear seat lock open lever sub-assembly RH | |
| Power seat motor assembly RH | ||
| Rear No. 1 seat lock cable assembly RH | ||
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| After slide lock release function operates (during slide lock operation), buzzer operates (for Rear RH Side) | Power seat motor assembly RH | |
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Buzzer sounds when the engine switch is turned on (IG) (for Rear RH Side) | Seat position initialization | |
| Power seat motor assembly RH | ||
| Harness or connector | - | |
| Position control ECU assembly RH |
*: Check that the slide lock can be released by manual operation.
| Symptom | Suspected Area | Link |
|---|---|---|
| Power seat position is not memorized or does not return to memorized position | Proceed to "Power Seat Position is not Memorized or does not Return to Memorized Position" |
| Symptom | Suspected Area | Link |
|---|---|---|
| Return function does not operate using the rear power seat switch LH (for Rear LH Side) | Rear power seat switch LH | |
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Return function does not operate using the rear power seat return switch LH (for Rear LH Side) | Rear power seat return switch LH (for LHD) | |
| Rear power seat return switch LH (for RHD) | ||
| Rear seat cushion pad LH (occupant detection sensor) | ||
| Rear No. 1 seat belt assembly inner LH | ||
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| When rear power seat return switch LH is operated with rear No. 1 seat occupied, return function operates (for Rear LH Side) | Rear seat cushion pad LH (occupant detection sensor) | |
| Rear No. 1 seat belt assembly inner LH | ||
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Return function does not operate (for Rear LH Side) | Harness or connector | - |
| Position control ECU assembly LH | ||
| Return function does not operate using the rear power seat switch RH (for Rear RH Side) | Rear power seat switch RH | |
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Return function does not operate using the rear power seat return switch RH (for Rear RH Side) | Rear power seat return switch RH (for LHD) | |
| Rear power seat return switch RH (for RHD) | ||
| Rear seat cushion pad RH (occupant detection sensor) | ||
| Rear No. 1 seat belt assembly inner RH | ||
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| When rear power seat return switch RH is operated with rear No. 1 seat occupied, return function operates (for Rear RH Side) | Rear seat cushion pad RH (occupant detection sensor) | |
| Rear No. 1 seat belt assembly inner RH | ||
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Return function does not operate (for Rear RH Side) | Harness or connector | - |
| Position control ECU assembly RH |
| Symptom | Suspected Area | Link |
|---|---|---|
| Power walk in function does not operate using the rear power seat switch LH (walk in switch) (for Rear LH Side) | Rear power seat switch LH (walk in switch) | |
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Power walk in function does not operate using the rear No. 3 power seat switch LH (for Rear LH Side) | Rear No. 3 power seat switch LH | |
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Power walk in function operates with rear No. 1 seat occupied (for Rear LH Side) | Rear seat cushion pad LH (occupant detection sensor) | |
| Rear No. 1 seat belt assembly inner LH | ||
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| ower walk in function operates while vehicle is being driven (for Rear LH Side) | Harness or connector | - |
| Position control ECU assembly LH | ||
| Power walk in function does not operate (for Rear LH Side) | Rear seat cushion pad LH (occupant detection sensor) | |
| Rear No. 1 seat belt assembly inner LH | ||
| Harness or connector | - | |
| Position control ECU assembly LH | ||
| Power walk in function do not operate using the rear power seat switch RH (walk in switch) (for Rear RH Side) | Rear power seat switch RH (walk in switch) | |
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Power walk in function do not operate using the rear No. 3 power seat switch RH (for Rear RH Side) | Rear No. 3 power seat switch RH | |
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Power walk in function operates with rear No. 1 seat occupied (for Rear RH Side) | Rear seat cushion pad RH (occupant detection sensor) | |
| Rear No. 1 seat belt assembly inner RH | ||
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Power walk in function operates while vehicle is being driven (for Rear RH Side) | Harness or connector | - |
| Position control ECU assembly RH | ||
| Power walk in function does not operate (for Rear RH Side) | Rear seat cushion pad RH (occupant detection sensor) | |
| Rear No. 1 seat belt assembly inner RH | ||
| Harness or connector | - | |
| Position control ECU assembly RH | ||
| Power walk in function does not operate for rear left and right seats | Harness or connector | - |
| Main body ECU (multiplex network body ECU) | ||
| Power walk in function operates for rear left and right seats while vehicle is being driven | Harness or connector | - |
| Main body ECU (multiplex network body ECU) |