GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1997 🢒 Chevy P62 Commercial Chassis 🢒 Body and Accessories 🢒 Horns 🢒 Horns Always On

Horns Always On P92

Horn On At All Times

Step

Action

Value(s)

Yes

No

1
  1. Remove the horn relay.
  2. Probe the relay socket at terminal 87 using a grounded test lamp.

Does the test lamp illuminate?

--

Go to Step 2

Go to Step 3

2

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

Is the repair complete?

--

System OK

--

3
  1. Remove the horn relay.
  2. Connect a test lamp to the positive battery terminal.
  3. Use the test lamp to probe terminal 85 (PPL 44).

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 4

4

Replace the horn relay.

Is the repair complete?

--

System OK

--

5

Is the horn switch OK?

--

Go to Step 6

Go to Step 7

6

Repair the short circuit between the horn switch and the horn relay.

Is the repair complete?

--

System OK

--

7

Replace the horn switch.

Is the repair complete?

--

System OK

--

Horns Always On P72

Horn On At All Times

Step

Action

Value(s)

Yes

No

1
  1. Remove the horn relay.
  2. Probe the relay socket at terminal E (DK GRN 29) using a grounded test lamp.

Does the test lamp illuminate?

--

Go to Step 2

Go to Step 3

2

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

Is the repair complete?

--

System OK

--

3
  1. Remove the horn relay.
  2. Connect a test lamp to the positive battery terminal.
  3. Use the test lamp to probe terminal F (BLK 28).

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 4

4

Replace the horn relay.

Is the repair complete?

--

System OK

--

5

Is the horn switch OK?

--

Go to Step 6

Go to Step 7

6

Repair the short circuit between the horn switch and the horn relay.

Is the repair complete?

--

System OK

--

7

Replace the horn switch.

Is the repair complete?

--

System OK

--