1. Remove the horn relay.
2. Use a test lamp in order to probe the horn relay connector from cavity 85 to ground.

Does the test lamp light?

--

Go to Step 2

Go to Step 3

Use a test lamp in order to probe the horn relay connector from cavity 30 to ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 5

Replace the junction block.

Is the repair complete?

--

System OK

--

1. Use a test lamp in order to probe the horn relay connector from cavity 86 to B+.
2. Press either horn switch.

Does the test lamp light?

--

Go to Step 9

Go to Step 6

Replace the junction block.

Is the repair complete?

--

System OK

--

1. Use a test lamp in order to backprobe the junction block connector C3 from cavity 5 to B+.
2. Press either horn switch.

Does the test lamp light?

--

Go to Step 7

Go to Step 8

Replace the junction block.

Is the repair complete?

--

System OK

--

1. Inspect for an open in BLK wire between the right side horn switch and the SIR contact coil.
2. If OK, replace the SIR contact coil.

Is the repair complete?

--

System OK

--

Connect a fused jumper from the horn relay connector cavity 30 to cavity 87.

Does the horn sound?

--

Go to Step 11

Go to Step 10

1. Remove the fused jumper from the horn relay connector.
2. Use a test lamp in order to backprobe the horn BLK wire connector to B+

Does the test lamp light?

--

Go to Step 12

Go to Step 13

Replace the horn relay.

Is the repair complete?

--

System OK

--

1. Inspect for an open in GRN wire between the horn and the horn relay.
2. If OK, replace the horn.

Is the repair complete?

--

System OK

--

1. Inspect for a poor ground connection at G102.
2. If the connection is OK, repair the open in BLK wire between the horn and G102.

Is the repair complete?

--

System OK

--