No.1 HORN DOES NOT OPERATE[HORN]

id0903h1818900

STEP

INSPECTION

ACTION

1

INSPECT POWER SUPPLY TO HORN RELAY

Remove the horn relay.

Measure the voltage between horn relay terminals (D, E) (CJB-side)and ground.

Is the voltage more than 10 V?

Yes

Go to the next step.

No

Repair or replace the wiring harness. Inspect the system for normal operation.

2

INSPECT HORN RELAY

Inspect the horn relay.

Is the horn relay normal?

Yes

Go to the next step.

No

Replace the horn relay. Inspect the system for normal operation.

3

INSPECT HORN SWITCH SIGNAL

Measure the resistance between horn relay terminal A (CJB-side) and ground under the following conditions.

•  The horn switch is depressed: Less than 5 ohms

•  The horn switch is not depressed: 10,000 ohms or more

Is the resistance normal?

Yes

Go to the next step.

No

Go to Step 5.

4

INSPECT CIRCUIT BETWEEN HORN RELAY AND HORN

Measure the resistance between horn relay terminal C (CJB-side) and horn (LH) terminal A (harness-side) or horn (RH) terminal A (harness-side).

Measure the resistance between horn relay terminal C (CJB-side) and ground.

Is the resistance less than 5 ohms between horn relay and horn, and more than 10,000 ohms between horn relay and ground?

Yes

Replace the horn. Inspect the system for normal operation.

No

Repair or replace the wiring harness. Inspect the system for normal operation.

5

INSPECT CIRCUIT BETWEEN HORN RELAY AND CLOCK SPRING

Disconnect the clock spring connector.

Measure the resistance between clock spring terminal A (harness-side) and horn relay terminal A (CJB-side).

Is the resistance less than 5 ohms?

Yes

Go to the next step.

No

Repair or replace the wiring harness. Inspect the system for normal operation.

6

INSPECT HORN SWITCH

Measure the resistance between clock spring terminal A (harness-side) and ground under the following conditions.

•  The horn switch is depressed: Less than 5 ohms

•  The horn switch is not depressed: 10,000 ohms or more

Is the resistance normal?

Yes

Replace the clock spring.

No

Replace the driver-side air bag module. Inspect the system for normal operation.

STEP	INSPECTION		ACTION
1	INSPECT POWER SUPPLY TO HORN RELAY Remove the horn relay. Measure the voltage between horn relay terminals (D, E) (CJB-side)and ground. Is the voltage more than 10 V?	Yes	Go to the next step.
1		No	Repair or replace the wiring harness. Inspect the system for normal operation.
2	INSPECT HORN RELAY Inspect the horn relay. Is the horn relay normal?	Yes	Go to the next step.
2		No	Replace the horn relay. Inspect the system for normal operation.
3	INSPECT HORN SWITCH SIGNAL Measure the resistance between horn relay terminal A (CJB-side) and ground under the following conditions. • The horn switch is depressed: Less than 5 ohms • The horn switch is not depressed: 10,000 ohms or more Is the resistance normal?	Yes	Go to the next step.
3		No	Go to Step 5.
4	INSPECT CIRCUIT BETWEEN HORN RELAY AND HORN Measure the resistance between horn relay terminal C (CJB-side) and horn (LH) terminal A (harness-side) or horn (RH) terminal A (harness-side). Measure the resistance between horn relay terminal C (CJB-side) and ground. Is the resistance less than 5 ohms between horn relay and horn, and more than 10,000 ohms between horn relay and ground?	Yes	Replace the horn. Inspect the system for normal operation.
4		No	Repair or replace the wiring harness. Inspect the system for normal operation.
5	INSPECT CIRCUIT BETWEEN HORN RELAY AND CLOCK SPRING Disconnect the clock spring connector. Measure the resistance between clock spring terminal A (harness-side) and horn relay terminal A (CJB-side). Is the resistance less than 5 ohms?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness. Inspect the system for normal operation.
6	INSPECT HORN SWITCH Measure the resistance between clock spring terminal A (harness-side) and ground under the following conditions. • The horn switch is depressed: Less than 5 ohms • The horn switch is not depressed: 10,000 ohms or more Is the resistance normal?	Yes	Replace the clock spring.
6		No	Replace the driver-side air bag module. Inspect the system for normal operation.