Toyota 4Runner: Short to GND in Hall Effect Sensor Power Circuit (31)

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

DTC No.	Detection Condition	Trouble Area
31	The side auto step motor hall sensor voltage is less than 4 V when the automatic running board is in operation.	Wire harness or connector Side auto step motor assembly Side auto step controller ECU assembly

WIRING DIAGRAM

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (SIDE AUTO STEP MOTOR POWER SOURCE)

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

*1: for LH
*2: for RH

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

Standard Voltage:

for LH

Tester Connection	Condition	Specified Condition
O25-3 (+1) - Body Ground	When the automatic running board LH is being deployed or stowed.	8 to 11 V

for RH

Tester Connection	Condition	Specified Condition
N23-3 (+2) - Body Ground	When the automatic running board RH is being deployed or stowed.	8 to 11 V

Text in Illustration

for LH

for RH

Front view of wire harness connector

(to Side Auto Step Motor Assembly)

REPLACE SIDE AUTO STEP MOTOR ASSEMBLY

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

(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
A41-14 (SSR+) - Body Ground	Always	10 kΩ or higher
A41-14 (SSR+) - A41-5 (SSR-)	Always	10 kΩ or higher

REPLACE SIDE AUTO STEP CONTROLLER ECU ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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Open in Motor LH Circuit (22,24)

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