Ford Falcon. Manual — part 337

413-06-5 Horn 413-06-5

DIAGNOSIS AND TESTING (Continued)

Test Step

Result / Action to Take

A3

CHECK STEERING WHEEL PAD HORN SWITCH

SIGNAL TO HORN RELAY

Measure the resistance between the horn relay [Circuit 1], harness

Yes

side and ground under the following conditions:

Go to A4.

No

Go to A5.

Steering Wheel Pad Horn

Resistance

Switch Position

Pressed

Less than 5 ohms

Released

Greater than 10,000 ohms

Are the resistances correct?

A4

CHECK CIRCUIT BETWEEN HORN RELAY AND HORN

Disconnect Horn(s).

Yes

INSTALL a new horn, REFER to Horn in this

Measure the resistance between the horn relay [Circuit 1A], harness

section. TEST the system for normal operation.

side and the LH horn, circuit 1B, harness side or the RH horn , circuit
1C, harness side; and between the horn relay [Circuit 1A], harness

No

side and ground.

REPAIR the circuit. TEST the system for normal
operation.

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

A5

CHECK CIRCUIT BETWEEN HORN RELAY AND AIR

BAG SLIDING CONTACT

Disconnect the clockspring. For removal instructions for closkspring,

Yes

Section 211-04.

Go to A6.

Measure the resistance between the clockspring, circuit 1B, harness

No

side and the horn relay [Circuit 4], harness side.

REPAIR the circuit. TEST the system for normal
operation.

Is the resistance less than 5 ohms?

A6

CHECK THE STEERING WHEEL PAD HORN SWITCH

Deactivate the air bag system. Refer to Section 501-20b .

Yes

INSTALL a new air bag sliding contact, REFER

Disconnect Steering Wheel Pad Horn Switch Harness.

to Section 501-20b. TEST the system for normal
operation.

Measure the resistance between the between the steering wheel pad
horn switch harness, circuit 57CH, harness side and ground under the

No

following conditions:

INSTALL a new driver side air bag module,
REFER to Section 501-20b. TEST the system
for normal operation.

Steering Wheel Pad Horn

Resistance

Switch Position

Pressed

Less than 5 ohms

Released

Greater than 10,000 ohms

Are the resistances correct?

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413-06-6 Horn 413-06-6

DIAGNOSIS AND TESTING (Continued)

PINPOINT TEST B : THE HORN SOUNDS CONTINUOUSLY

Test Step

Result / Action to Take

B1

CHECK HORN CIRCUIT

Key in OFF position.

Yes

REPAIR circuit 1A. TEST the system for normal

Disconnect Horn Relay.

operation.

Does the horn continue to sound?

No

Go to B2.

B2

CHECK HORN RELAY

Test the Horn Relay.

Yes

REINSTALL the horn relay. Go to B3.

Is the horn relay OK?

No

INSTALL a new horn relay. TEST the system for
normal operation.

B3

CHECK CIRCUIT

Disconnect the clockspring.

Yes

If equipped with anti-theft, Go to B4. Otherwise,

Does the horn continue to sound?

REPAIR the circuit. TEST the system for normal
operation.

No

Go to B5.

B4

CHECK BEM INPUT

Disconnect BEM.

Yes

REPAIR circuit 1A. TEST the system for normal

Does the horn continue to sound?

operation.

No

REFER to Section 419-10. TEST the system for
normal operation.

B5

CHECK STEERING WHEEL PAD HORN SWITCH

Deactivate the air bag system. Refer to Section 501-20b .

Yes

INSTALL a new air bag sliding contact, REFER

Disconnect Steering Wheel Pad Horn Switch Harness.

to Section 501-20b . TEST the system for
normal operation.

Measure the resistance between the steering wheel pad horn switch
harness, circuit 57CH, harness side and ground under the following

No

conditions:

INSTALL a new driver side air bag module,
REFER to Section 501-20b . TEST the system
for normal operation.

Steering Wheel Pad Horn

Resistance

Switch Position

Pressed

Less than 5 ohms

Released

Greater than 10,000 ohms

Are the resistances correct?

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413-06-7 Horn 413-06-7

DIAGNOSIS AND TESTING (Continued)

PINPOINT TEST C : ONE HORN FAILS TO OPERATE

Test Step

Result / Action to Take

C1

CHECK HORN 1 FOR OPERATION

Disconnect Horn 2 from wiring harness

Yes

Go to C4

Depress horn pad on sterring wheel

No

Does horn 1 sound?

Go to C2

C2

CHECK POWER WIRE ON HORN 1

Remove horn relay

Yes

Go to C3

Measure resistance of circuit 1A-1B

No

Is resistance <5 ohms?

There is a break in the wire. Repair harness and
retest for correct operation.

C3

CHECK EARTH WIRE FROM HORN 1

Remove Horn 1

Yes

Horn must be faulty. Replace horn and retest for

Measure resistance of circuit 57AF to ground

correct operation.

Is resistance <5 ohms?

No

There is a break in the wire. Repair harness and
retest for correct operation.

C4

CHECK HORN 2 FOR OPERATION

Disconnect Horn 1 from wiring harness

Yes

Horn is operating correctly.

Reconnect Horn 2 to wiring harness

No

Depress horn pad on sterring wheel

Go to C5

Does horn 2 sound

C5

CHECK POWER WIRE TO HORN 2

Remove horn relay

Yes

Go to C6

Measure resistance of circuit 1A-1C

No

Is resistance <5 ohms?

There is a break in the wire. Repair harness and
retest for correct operation.

C6

CHECK EARTH WIRE FROM HORN 2

Remove Horn 2

Yes

Horn must be faulty. Replace horn and retest for

Measure resistance of circuit 57AG to ground

correct operation.

Is resistance <5 ohms?

No

There is a break in the wire. Repair harness and
retest for correct operation.

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413-06-8 Horn 413-06-8

REMOVAL AND INSTALLATION

Horn

Removal
1. Remove the grille from between the headlamps.
2. Disconnect the electrical connector(s) .
3. Remove the horn and bracket assembly(s).

1. Disconnect the electrical connector.

2.

Remove

the

nut.

3. Remove the horn.

4. To install, reverse the removal procedure.

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