Use a grounded test lamp to verify power to the circuit breaker.

Does the test lamp illuminate when the circuit breaker supply terminal is touched?

--

Go to Step 3

Go to Step 2

Repair the open circuit between the battery and the circuit breaker.

Is the repair complete?

--

System OK

--

1. Remove the horn relay.
2. Probe terminals 86 and 30 at the relay using a grounded test lamp.

Does the test lamp illuminate when each terminal is touched?

--

Go to Step 5

Go to Step 4

Repair the open circuit between the relay and the circuit breaker.

Is the repair complete?

--

System OK

--

1. Remove the horn relay.
2. Connect a jumper between terminals 30 and 87 of the horn relay socket.

Does the horn operate when the connection is made?

--

Go to Step 9

Go to Step 6

1. Leave the jumper connected at the relay.
2. Disconnect the positive lead to the horn.
3. Probe the positive lead to the horn using a grounded test lamp.

Does the test lamp illuminate?

--

Go to Step 8

Go to Step 7

Repair the open circuit between the horn and the horn relay.

Is the repair complete?

--

System OK

--

Replace the horn.

Is the repair complete?

--

System OK

--

1. Reinstall the horn relay.
2. Use a voltmeter to probe the PPL (44) wire at the horn relay.

Does the voltmeter indicate battery voltage?

--

Go to Step 11

Go to Step 10

Replace the horn relay.

Is the repair complete?

--

System OK

--

With the horn relay in place, connect a jumper between the PPL (44) (terminal 85) wire and the ground.

Does the horn operate?

--

Go to Step 12

Go to Step 10

1. Remove the steering wheel.
2. Use a jumper to apply a ground to the horn brush at the slip ring.

Does the horn operate?

--

Go to Step 14

Go to Step 13

Repair the open circuit between the horn relay and the slip ring.

Is the repair complete?

--

System OK

--

Repair the horn switch.

Is the repair complete?

--

System OK

--

Check the 15A HORN/DM fuse.

Is the fuse blown?

--

Go to Step 2

Go to Step 3

1. Check for a short circuit.
2. Repair if necessary and replace the fuse.

Is the repair complete?

--

System OK

--

Use a grounded test lamp to verify power to the fuse.

Does the test lamp illuminate when the fuse supply terminal is touched?

--

Go to Step 5

Go to Step 4

Repair the open circuit between the battery and the fuse.

Is the repair complete?

--

System OK

--

1. Remove the horn relay.
2. Probe each of the ORN (240) wires at the relay using a grounded test lamp.

Does the test lamp illuminate when each ORN (240) terminal is touched?

--

Go to Step 7

Go to Step 6

Repair the open circuit between the relay and the 15A fuse.

Is the repair complete?

--

System OK

--

1. Remove the horn relay.
2. Connect a jumper between the ORN (240) wire at terminal D and the DK GRN (29) wire at terminal E.

Does the horn operate when the connection is made?

--

Go to Step 11

Go to Step 8

1. Leave the jumper connected at the relay.
2. Disconnect the positive lead to the horn.
3. Probe the positive lead to the horn using a grounded test lamp.

Does the test lamp illuminate?

--

Go to Step 10

Go to Step 9

Repair the open circuit between the horn and the horn relay.

Is the repair complete?

--

System OK

--

Replace the horn.

Is the repair complete?

--

System OK

--

1. Reinstall the horn relay.
2. Use a voltmeter to probe the BLK (28) wire terminal F at the horn relay.

Does the voltmeter indicate battery voltage?

--

Go to Step 13

Go to Step 12

Replace the horn relay.

Is the repair complete?

--

System OK

--

With the horn relay in place, connect a jumper between the BLK (28) wire terminal F and the ground.

Does the horn operate?

--

Go to Step 14

Go to Step 12

1. Remove the steering wheel.
2. Use a jumper to apply a ground to the horn brush at the slip ring.

Does the horn operate?

--

Go to Step 16

Go to Step 15

Repair the open circuit between the horn relay and the slip ring.

Is the repair complete?

--

System OK

--

Repair the horn switch.

Is the repair complete?

--

System OK

--