11.13.7 Diagnostic Information and Procedures
11.13.7.1 Diagnosis Description

Refer to 

11.13.2.1

 

Description and Operation

get familiar with the system functions and operation before start system diagnostics,

so that it will help to determine the correct diagnostic steps, more importantly, it will also help to determine whether the customer
described situation is normal.

11.13.7.2 Visual Inspection

–

Check installed aftermarket equipment that may affect the horn operation.

–

Check the easy to access system components to identify whether there is a significant damage or a potential malfunction.

–

If the two speakers are inoperative, check and repair the power supply or switch ground circuit poor connection or open circuit
before replace the horn.

Warning!

For horn and the clock spring removal and inspection, please strictly abide by the airbag system safety operation. Refer
to "SIR Warning."

11.13.7.3 Horn Switch Contact Adjustment

When horns are intermittent inoperative, or one side of the steering wheel horn push switch is inoperative, it is likely that the horn
contact switch has poor connection. At this time, adjust the driver front airbag horn switch contact.

Warning!

For airbag module removal, please strictly abide by the airbag system safety operation. Refer to "SIR Warning."

Body Electric

Horn

11-453

11.13.7.4 Horn Inoperative

Schematic:

From Battery

Horn Relay

Horn 

Switch

Tweeter

Subwoofer

FE11-6200b

Diagnostic Steps:

Step 1

Check the fuse IF24.

IF14

IF2

IF1

IF5

IF7

IF3

IF16

IF27

IF25

IF26

IF28

IF30

IF24

IF20

IF19

IF23

IF18

IF21

IF13

IF12

IF15

IF9

IF10

IF8

F17

F22

M

FE11-6201b

(a)

Check whether the fuse IF24 is blown.

Fuse Rated Current: 10 A

No

Go to step 3

11-454

Horn

Body Electric

Yes

Step 2

Check fuse IF24 circuit.

(a)

Check whether there is a short circuit.

(b)

Repair the circuits. Confirm that there are no short circuits.

(c)

Replace with fuses with rated current.

Is horn working properly?

Yes

System normal

No

Step 3

Check the horn switch.

(a)

Press the horn switch.

(b)

At the same time, test continuity between the horn switch
harness connector terminal No.1 and the ground with a
multimeter.

Test Terminal

Test

Conditions

Continuity

Terminal No.1 - Body

Ground

Release

10 kΩ or higher

Terminal No.1 - Body

Ground

Press

Less than 1 Ω

Is the resistance specified value?

Yes

Go to step 5

No

Step 4

Adjust the horn switch contacts.

(a)

Adjust the horn switch contacts. Refer to 

11.13.7.3

 

Horn

Switch Contact Adjustment

.

Is horn working properly?

Yes

System normal

No

Step 5

Check the clock spring.

(a)

Press the horn switch.

(b)

At the same time, test continuity between the clock spring
harness connector IP22 terminal No.4 and the ground with a
multimeter.

Test Terminal

Test

Conditions

Continuity

Terminal 4 - Body Ground

Release

10 kΩ or higher

Body Electric

Horn

11-455

Terminal 4 - Body Ground

Press

Less than 1 Ω

Is the resistance specified value?

Yes

Go to step 7

No

Step 6

Repair clock spring open circuit.

(a)

Repair the open circuit between the clock spring harness
connector IP22 terminal No.4 and the horn switch harness
connector terminal No.1.

(b)

If necessary, replace the clock spring.

Is horn working properly?

Yes

System normal

No

Step 7

Check the horn relay.

1 2

3
8

7

6

5

4

To I/P Fuse Block 3 Harness 
Connector IP10

FE11-6202b

(a)

Press the horn switch.

(b)

Measure the I/P fuse block wiring harness connector IP10
terminal No.8 voltage with a multimeter.
Standard Voltage: 11-14 V

Yes

Go to step 9

No

Step 8

Replace the I/P fuse block.

(a)

Check whether there is a short circuit.

(b)

Repair the circuits. Confirm that there are no short circuits.

(c)

Replace the I/P fuse block.

Is horn working properly?

Yes

System normal

No

Step 9

Check the horn power supply circuit.

(a)

Press the horn button.

(b)

Measure the horn harness connector terminal No.1 voltage
with a multimeter.

11-456

Horn

Body Electric