Toyota 4Runner: Problem Symptoms Table

Toyota 4Runner Service Manual / Vehicle Exterior / Exterior Panels / Trim / Automatic Running Board System / 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.

Auto Running Board System

Symptom	Suspected Area	See page
The automatic running board does not function.	PRB fuse
	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	-

Initialization

INITIALIZATION 1. INITIALIZE AUTOMATIC RUNNING BOARD SYSTEM NOTICE: When a side auto step controller ECU assembly is replaced, the side auto step controller ECU assembly must be initialized. Func ...

Terminals Of Ecu

TERMINALS OF ECU 1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (a) Measure the voltage according to the value(s) in the table below. Ter ...

Other materials about Toyota 4Runner:

Power Supply Drive Circuit (C1257)
DESCRIPTION The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU. DTC Code DTC Detection Condition Trouble Area ...

Terminals Of Ecu
TERMINALS OF ECU 1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND DRIVER SIDE JUNCTION BLOCK ASSEMBLY (a) Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly (See page ). (b) Measure the resistanc ...

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