Toyota 4Runner: Side Auto Step Switch Circuit

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

HINT:

Inspection should be performed on the door courtesy switch circuit on the side where the automatic running board is malfunctioning.

PROCEDURE

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

(a) Disconnect the F90 side auto step switch assembly connector.

(b) Disconnect the A42 side auto step controller ECU assembly connector.

Standard Resistance (Check for Open):

for LH

Tester Connection	Condition	Specified Condition
F90-4 (ECU1) - A42-14 (CTY1)	Always	Below 1 Ω

for RH

Tester Connection	Condition	Specified Condition
F90-6 (ECU2) - A42-13 (CTY2)	Always	Below 1 Ω

Standard Resistance (Check for Short):

for LH

Tester Connection	Condition	Specified Condition
A42-14 (CTY1) - Body ground	Always	10 kΩ or higher

for RH

Tester Connection	Condition	Specified Condition
A42-13 (CTY2) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

Side Auto Step ECU Power Source Circuit

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Door Courtesy 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 / ...

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