FORESTER 20MY PubNo: G8270BE Version: 006

COMMUNICATION SYSTEM > General Description　

COMPONENT

(1)	Horn switch (driver’s airbag module)	(4)	Horn ASSY Hi	Tightening torque: N·m (kgf-m, ft-lb)
(2)	Steering roll connector	(5)	Horn ASSY Lo	T:	18 (1.8, 13.3)
(3)	Horn relay

COMMUNICATION SYSTEM > General Description　

CAUTION

When performing service operation, refer to “Repair Contents” in “General Description”. REPAIR CONTENTS>Repair Contents
Before performing vehicle maintenance, turn the ignition switch to OFF and disconnect the ground terminal from the battery sensor. REPAIR CONTENTS>NOTE > BATTERY
When replacing the audio and MFD parts provided with memory functions, record the memory contents before disconnecting the ground terminal from the battery sensor.
Be careful of the following items. Failing to do so may cause the airbag system malfunction.
- Yellow connectors and harnesses with yellow tapes around them are the connectors and harnesses for the airbag system. When using a tester on these circuits, follow the cautions of “AIRBAG SYSTEM”.
- Be careful not to damage the airbag system wiring harness when servicing the electrical parts around the steering column. AIRBAG SYSTEM>General Description>CAUTION
If the hydraulic unit assembly VDC, bracket COMPL hydraulic unit VDC, steering wheel and the sensor assembly VDC steering (steering roll connector) are removed, installed or replaced, perform “VSC(VDC) Centering Mode” of the VDC. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT

COMMUNICATION SYSTEM > General Description　

PREPARATION TOOL

1. GENERAL TOOL

TOOL NAME	REMARKS
Circuit tester	Used for measuring resistance, voltage and current.

COMMUNICATION SYSTEM > Relay and Fuse　

LOCATION

Main fuse box (M/B)	Horn relay	(A)
	Fuse 7.5 A (horn ASSY Hi)	(B)
	Fuse 7.5 A (horn ASSY Lo)	(C)

For other related fuses, refer to the wiring diagram. WIRING SYSTEM>Power Supply Circuit

COMMUNICATION SYSTEM > Relay and Fuse　

INSPECTION

1. CHECK FUSE

1.

Remove the fuse and inspect visually.

2.

If the fuse is blown out, replace the fuse.

2. CHECK RELAY

1.

Check the resistance between relay terminals.

Terminal No.	Inspection conditions	Standard	Circuit
1 — 3	Always	1 MΩ or more
1 — 3	Apply battery voltage between terminals 2 and 4.	Less than 1 Ω

2.

Replace the relay if the inspection result is not within the standard value.

COMMUNICATION SYSTEM > Horn System　

WIRING DIAGRAM

Refer to “Horn System” in the wiring diagram. WIRING SYSTEM>Horn System>WIRING DIAGRAM

COMMUNICATION SYSTEM > Horn System　

INSPECTION

Symptoms	Inspection steps
Horn does not sound	1. Check the fuse.
	2. Check the horn relay.
	3. Check the steering roll connector.
	4. Check the horn switch.
	5. Check the horn assembly.
	6. Check the harness.

COMMUNICATION SYSTEM > Horn System　

NOTE

For procedure of each component in the horn system, refer to the respective section.

Horn assembly: COMMUNICATION SYSTEM>Horn
Horn switch: COMMUNICATION SYSTEM>Horn Switch

COMMUNICATION SYSTEM > Horn　

REMOVAL

1. HORN ASSEMBLY HI

1.

Disconnect the ground terminal from battery sensor. REPAIR CONTENTS>NOTE > BATTERY

2.

Remove the air intake duct (rear). INTAKE (INDUCTION)(H4DO)>Air Intake Duct>REMOVAL

3.

Remove the bracket grille front.

(1)

Apply the protective tapes on the bracket grille front and the grille assembly front LWR.

(2)

Remove the clips, and remove the bracket grille front.

4.

Remove the horn assembly Hi.

(1)

Disconnect the connector.

(2)

Remove the bolt, and remove the horn assembly Hi.

2. HORN ASSEMBLY LO

When removing the horn, do not remove the bumper face front. Bracket connection portion of the bumper face may become damaged.

1.

Disconnect the ground terminal from battery sensor. REPAIR CONTENTS>NOTE > BATTERY

2.

Lift up the vehicle.

3.

Remove the under cover front. EXTERIOR/INTERIOR TRIM>Front Under Cover>REMOVAL

4.

Remove the screw and clips, and turn over the mud guard front on the right side.

5.

Remove the horn assembly Lo.

(1)

Disconnect the connector.

(2)

Remove the bolt, and remove the horn assembly Lo.

COMMUNICATION SYSTEM > Horn　

INSTALLATION

Install the mud guard front so that the front end of the mud guard (b), except for the clip fixing point, comes inside the bumper face (a).

1.

Install the horn assembly.

Tightening torque:

18 N·m (1.8kgf-m, 13.3ft-lb)

2.

Install the mud guard front. (Lo side)

3.

Install the under cover front. (Lo side)

Tightening torque:

18 N·m (1.8kgf-m, 13.3ft-lb)

4.

Lower the vehicle. (Lo side)

5.

Install the bracket grille front. (Hi side)

6.

Install the air intake duct (rear). (Hi side)

7.

Connect the ground terminal to battery sensor. REPAIR CONTENTS>NOTE > BATTERY

COMMUNICATION SYSTEM > Horn　

INSPECTION

1.

Remove the horn assembly. COMMUNICATION SYSTEM>Horn>REMOVAL

2.

Check the horn sounds when applying the battery voltage to the horn assembly.

Horn assembly Lo side
Horn assembly Hi side

Terminal No.

Inspection conditions

Specification

1 (+) — Horn case (−)

Connect battery to the terminals

Sounds

Terminal No.	Inspection conditions	Specification
1 (+) — Horn case (−)	Connect battery to the terminals	Sounds

3.

If it does not operate normally, replace the horn assembly.

COMMUNICATION SYSTEM > Horn Switch　

NOTE

Horn switch is a unit with the driver’s airbag module. For operation procedures, refer to “Driver’s Airbag Module” in “AIRBAG SYSTEM”. AIRBAG SYSTEM>Driver’s Airbag Module

COMMUNICATION SYSTEM > Horn Switch　

INSPECTION

1. CHECK HORN SWITCH

Before handling the airbag system components, refer to “CAUTION” of “General Description” in “AIRBAG SYSTEM”. AIRBAG SYSTEM>General Description>CAUTION

1. CHECK HORN SWITCH TERMINAL.

1.

Turn the ignition switch to OFF.

2.

Disconnect the ground terminal from the battery sensor, and wait for at least 60 seconds before starting work. REPAIR CONTENTS>NOTE > BATTERY

3.

Remove the driver’s airbag module. AIRBAG SYSTEM>Driver’s Airbag Module>REMOVAL

4.

Check that the connection of the horn switch harness connector is correct.

5.

Measure the resistance between connectors.

Preparation tool:

Circuit tester

(a)	Ground terminal
(b)	Horn switch terminal

Terminal No.	Standard
Horn switch terminal — ground terminal	Less than 1 Ω

Is the measured value within the standard value?

2

It is possible that there is an open circuit between horn switch terminal and ground terminal. Replace the satellite switch assembly.

2. CHECK DRIVER’S AIRBAG MODULE.

Measure the resistance between horn plate and snap pin hook.

Preparation tool:

Circuit tester

Terminal No.	Standard
Horn plate — Snap pin hook	1 MΩ or more

Is the measured resistance 1 MΩ or more?

3

Replace the driver’s airbag module.

3. CHECK DRIVER’S AIRBAG MODULE.

Measure the resistance between horn plate and snap pin hook with the snap pin hook pressed-in firmly.

Preparation tool:

Circuit tester

Terminal No.	Standard
Horn plate — Snap pin hook	Less than 1 Ω

Is the measured resistance less than 1 Ω?

Driver’s airbag module is normal.

Replace the driver’s airbag module.

2. CHECK STEERING ROLL CONNECTOR

Before handling the airbag system components, refer to “CAUTION” of “General Description” in “AIRBAG SYSTEM”. AIRBAG SYSTEM>General Description>CAUTION
If the steering wheel and steering angle sensor (steering roll connector) are removed, be sure to perform the following operations.
- Align the center position of the steering roll connector.
- Perform the neutral position setting of the steering angle sensor.

1. CHECK STEERING ROLL CONNECTOR.

1.

Turn the ignition switch to OFF.

2.

Disconnect the ground terminal from the battery sensor, and wait for at least 60 seconds before starting work. REPAIR CONTENTS>NOTE > BATTERY

3.

Measure the resistance between connectors.

Preparation tool:

Circuit tester

Terminal No.	Inspection conditions	Standard
A1 — C9	Always	Less than 1 Ω

Is the measured value within the standard value?

The steering roll connector is normal.

Replace the steering roll connector.

3. CHECK THE VEHICLE HARNESS

Before handling the airbag system components, refer to “CAUTION” of “General Description” in “AIRBAG SYSTEM”. AIRBAG SYSTEM>General Description>CAUTION
If the steering wheel and steering angle sensor (steering roll connector) are removed, be sure to perform the following operations.
- Align the center position of the steering roll connector.
- Perform the neutral position setting of the steering angle sensor.

1. CHECK THE VEHICLE HARNESS.

1.

Turn the ignition switch to OFF.

2.

Disconnect the ground terminal from the battery sensor, and wait for at least 60 seconds before starting work. REPAIR CONTENTS>NOTE > BATTERY

3.

Measure the resistance between connector — 12 V battery+ terminal side harness.

Preparation tool:

Circuit tester

Terminal No.	Standard
C-9 — 12 V battery+ terminal side harness	Less than 1 Ω

Is the measured value less than 1 Ω?

Vehicle harness is normal.

Repair the open circuit of vehicle harness.