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 | See page |
|---|---|---|
The automatic running board does not function. |
PRB fuse |
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Side auto step switch assembly |
|
|
Proceed to "Side Auto Step ECU Power Source Circuit" |
|
|
Proceed to "Side Auto Step Switch Circuit" |
|
|
Proceed to "Door Courtesy Switch Circuit" |
|
|
Side auto step controller ECU assembly |
|
|
The automatic running board is not stowed even when the door is closed. |
Proceed to "Door Courtesy Switch Circuit" |
|
Side auto step controller ECU assembly |
- |
|
The automatic running board is not stowed even when the vehicle is moving. |
Proceed to "Speed Signal Circuit" |
|
Main body ECU (Multiplex network body ECU) |
- |
|
The automatic running board reverses operation during deploying or stowing movement. |
Check that there is no foreign object blocking the automatic running board. |
- |
Check that there is no damage to the automatic running board link. |
- |
|
Side auto step motor assembly |
- |
Test yourself
A quick Toyota 4Runner quiz: every answer comes with an explanation and a link to the manual page.