Toyota 4Runner: Short to Battery in Motor RH Circuit (25,26)

Toyota 4Runner Service Manual / Vehicle Exterior / Exterior Panels / Trim / Automatic Running Board System / Short to Battery in Motor RH Circuit (25,26)

DESCRIPTION

When there is a short to battery in the side auto step motor circuit, the side auto step controller ECU assembly will not operate the automatic running board.

DTC No.	Detection Condition	Trouble Area
25	Short to battery in the stowing or deploying side of the side auto step motor LH circuit when the automatic running board is not in operation.	Wire harness or connector Side auto step controller ECU assembly
26	Short to battery in the stowing or deploying side of the side auto step motor RH circuit when the automatic running board is not in operation.

WIRING DIAGRAM

PROCEDURE

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

(a) Disconnect the O25*1 or N23*2 side auto step motor assembly connector.

*1: for LH
*2: for RH

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

Standard Voltage:

for LH

Tester Connection	Condition	Specified Condition
A42-3 (STW1) - Body ground	When the automatic running board LH is not in operation.	Below 1 V
A42-4 (DPL1) - Body ground	When the automatic running board LH is not in operation.	Below 1 V

for RH

Tester Connection	Condition	Specified Condition
A42-2 (STW2) - Body ground	When the automatic running board RH is not in operation.	Below 1 V
A42-1 (DPL2) - Body ground	When the automatic running board RH is not in operation.	Below 1 V

REPLACE SIDE AUTO STEP CONTROLLER ECU ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Short to Battery in Hall Effect Sensor Power Circuit (32)

DESCRIPTION When there is a short to battery in the side auto step motor hall sensor power circuit, the side auto step controller ECU assembly will not operate the automatic running board. ...

Short to GND in Hall Effect Sensor Power Circuit (31)

DESCRIPTION When there is a short to GND in the side auto step motor hall sensor power circuit, the side auto step controller ECU assembly does not operate the automatic running board. ...

Other materials about Toyota 4Runner:

On-vehicle Inspection
ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure listed below is for the LH side. PROCEDURE 1. CHECK REAR AIRBAG SENSOR LH (VEHICLE NOT INVOLVED IN COLLISION) (a) Perform ...

Removal
REMOVAL PROCEDURE 1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ). 2. REMOVE LOWER STEERING COLUMN COVER (a) Turn the st ...