Toyota 4Runner: Side Auto Step ECU Power Source Circuit

Toyota 4Runner Service Manual / Vehicle Exterior / Exterior Panels / Trim / Automatic Running Board System / Side Auto Step ECU Power Source Circuit

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (SIDE AUTO STEP CONTROLLER ECU - BODY GROUND)

(a) Disconnect the A41 side auto step controller ECU assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A41-1 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A41-4 (B) - Body ground	Always	11 to 14 V

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

Short to GND in Motor LH Circuit (21,23)

DESCRIPTION When there is a short to GND in the side auto step motor circuit, the side auto step controller ECU assembly does not operate the automatic running board. DTC No. ...

Side Auto Step Switch Circuit

DESCRIPTION The side auto step controller ECU assembly receives the door open/closed signal from each door courtesy light switch via the side auto step switch assembly. WIRING DIAGRAM CAUTION / ...

Other materials about Toyota 4Runner:

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" ...

Steering Angle Sensor Output Malfunction (C1434)
DESCRIPTION Steering angle sensor signals are sent to the skid control ECU via the CAN communication system. When there is a malfunction in the CAN communication system, it is detected by the steering angle sensor zero point malfunction diagnostic functio ...