Subaru Legacy BN/BS (2015-2019) Service Manual: Preparation tool

Subaru Legacy BN/BS (2015-2019) Service Manual / Airbag system (diagnostics) / General description / Preparation tool

CAUTION:

To measure the voltage and resistance of airbag system component, be sure to use the specified test harness.

1. SPECIAL TOOL

• SUBARU SELECT MONITOR

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

—

(Newly adopted tool)

SUBARU SELECT MONITOR 4

Used for setting of each function and troubleshooting for electrical system.

NOTE:

For detailed operation procedures of Subaru Select Monitor 4, refer to “Application help”.

• TEST HARNESS H

ILLUSTRATION	TOOL NUMBER	DESCRIPTION	REMARKS
	98299FA030	TEST HARNESS H	Used when measuring voltage and resistance of the front sub sensor.

• TEST HARNESS D

ILLUSTRATION	TOOL NUMBER	DESCRIPTION	REMARKS
	98299AG060	TEST HARNESS D	Used when measuring voltage and resistance of the seat cushion airbag.

• TEST HARNESS N

ILLUSTRATION	TOOL NUMBER	DESCRIPTION	REMARKS
	98299SA000	TEST HARNESS N	Used when measuring voltage and resistance of driver’s airbag module, seat belt pretensioner and curtain airbag module.

• TEST HARNESS Q

ILLUSTRATION	TOOL NUMBER	DESCRIPTION	REMARKS
	98299SA040	TEST HARNESS Q	Used when measuring voltage and resistance of driver’s airbag module.

• TEST HARNESS AG

ILLUSTRATION	TOOL NUMBER	DESCRIPTION	REMARKS
	98299AG070	TEST HARNESS AG	Used when measuring voltage and resistance of airbag control module.

• TEST HARNESS AD AV

ILLUSTRATION	TOOL NUMBER	DESCRIPTION	REMARKS
	98299AL010	TEST HARNESS AD AV	Used together with test harness AG when measuring voltage and resistance of the airbag control module.

• TEST HARNESS V

ILLUSTRATION	TOOL NUMBER	DESCRIPTION	REMARKS
	98299AG010	TEST HARNESS V	Used when measuring voltage and resistance of side airbag sensor and curtain airbag sensor.

• AIRBAG RESISTOR

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

98299PA040

AIRBAG RESISTOR

Used in replacement of airbag module for which resistance value is same as airbag module.

Two STs are required for diagnosis of two-stage inflator type airbag module.

• TEST HARNESS AT

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

98299CA020

TEST HARNESS AT

Used when measuring power supply and resistance of side airbag harness.

Two sets may be required.

• TEST HARNESS AI

ILLUSTRATION	TOOL NUMBER	DESCRIPTION	REMARKS
	98299AG090	TEST HARNESS AI	• Used for diagnoses of side airbag sensor and curtain airbag sensor. • Used together with test harness V.

• TEST HARNESS AW

ILLUSTRATION	TOOL NUMBER	DESCRIPTION	REMARKS
	98299AL020	TEST HARNESS AW	Used when diagnosing occupant detection system.

• TEST HARNESS Y

ILLUSTRATION	TOOL NUMBER	DESCRIPTION	REMARKS
	98299AG040	TEST HARNESS Y	Used for troubleshooting seat belt buckle switch.

• TEST HARNESS AE

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

98299XA030

TEST HARNESS AE

TEST HARNESS Y adapter harness.

Used for troubleshooting seat belt buckle switch.

2. GENERAL TOOL

TOOL NAME	REMARKS
Circuit tester	Used for measuring resistance, voltage and current.
Probe	Used when measuring voltage and resistance of passenger’s airbag module and front door impact sensor.
DST-i	Used together with Subaru Select Monitor 4.

3. HOW TO USE PROBE

• Passenger’s airbag module

Insert the probe into the harness hole, and contact it with the terminal.

(A)	Cross section

(1)	Probe	(3)	Harness	(5)	Connection
(2)	Connector (housing)	(4)	Terminal

CAUTION:

• Do not insert the probe forcibly.

• Be careful not to contact it to the connection (5) between the terminal and harness. (Harness will come off easily from connector if doing so.)

• Front door impact sensor

Insert the probe into the inspection hole to contact with the terminal.

(A)	Cross section

(1)	Probe	(3)	Terminal	(5)	Harness
(2)	Connector (housing)	(4)	Inspection hole

CAUTION:

• Do not push the probe with excessive force against the terminal. (Terminal will come off easily from housing if doing so.)

• Do not insert the probe anywhere other than inspection hole. (Waterproof property will be lost if doing so.)

Caution

Refer to “CAUTION” in “General Description” in AIRBAG SYSTEM. General Description > CAUTION ...

Other materials:

Dtc b1827 short in side airbag lh (to ground)
DIAGNOSIS START CONDITION:Ignition voltage is 10 V to 16 V.DTC DETECTING CONDITION:GND short circuit failure (shorted to ground in main harness, shorted to ground in front seat side airbag LH, shorted to ground in airbag CM internal circuit)CAUTION:Before performing diagnosis, refer to “CAUTIO ...