Lexus IS250 IS220d GSE20 ALE20 - SEAT
FRONT POWER SEAT CONTROL SYSTEM (w/ Seat Position Memory System) - PROBLEM SYMPTOMS TABLE
- HINT:
Use the table below to help determine the cause of the problem symptom. 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 the system before inspecting the suspected areas below.
| Symptom | Suspected area | See page |
| Power seat does not operate (manual or memorized position). | 1. Driver side ECU power source circuit | |
| 2. Front power seat switch (Position control ECU) | ||
| One of the power seat functions does not operate (manual or memorized position). | 1. Driver side power seat motor circuit | |
| 2. Front power seat switch (Position control ECU) | ||
| One or all manual seat functions do not operate (memorized positions OK). | Front power seat switch (Position control ECU) | |
| Memory function does not operate. | 1. Driver side seat memory switch circuit | |
| 2. Multiplex communication system | ||
| 3. Front power seat switch (Position control ECU) | ||
| No memory functions operate or all memory functions operate briefly and then stop (manual functions OK). | 1. Driver side ECU power source circuit | |
| 2. Front power seat switch (Position control ECU) | ||
| One memory function does not operate or operates briefly and then stops (manual functions OK). | 1. Front seat frame with adjuster (Power seat motor) | |
| 2. Front power seat switch (Position control ECU) | ||
| Wireless transmitter memory function does not operate. | 1. Perform the operation check. | |
| 2. Check the wireless door lock operation. | ||
| 3. Driver side seat memory switch circuit | ||
| 4. Multiplex communication system | ||
| 5. Front power seat switch (Position control ECU) | ||
| Wireless-linked return function does not operate. | 1. Perform the operation check. | |
| 2. Check the wireless door lock operation. | ||
| 3. Driver side seat memory switch circuit | ||
| 4. Drive side power seat motor circuit | ||
| 5. Multiplex communication system | ||
| 6. Front power seat switch (Position control ECU) |
| Symptom | Suspected area | See page |
| Power seat does not operate (manual or memorized position). | 1. Front passenger side ECU power source circuit | |
| 2. Front power seat switch (Position control ECU) | ||
| One of the power seat functions does not operate (manual or memorized position). | 1. Front passenger side power seat motor circuit | |
| 2. Front power seat switch (Position control ECU) | ||
| One or all manual seat functions do not operate (memorized positions OK). | Front power seat switch (Position control ECU) | |
| Memory function does not operate. | 1. Front passenger side seat memory switch circuit | |
| 2. Multiplex communication system | ||
| 3. Front power seat switch (Position control ECU) | ||
| No memory functions operate or all memory functions operate briefly and then stop (manual functions OK). | 1. Front passenger side ECU power source circuit | |
| 2. Front power seat switch (Position control ECU) | ||
| One memory function does not operate briefly and then stops (manual functions OK). | Front seat frame with adjuster (Power seat motor) |
LEXUS IS250, IS220d / GSE20 ALE20