GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1999 🢒 Firebird 🢒 Body and Accessories 🢒 Horns 🢒 Horns Always On

Step

Action

Value(s)

Yes

No

1

Disconnect the horn relay.

Are the horns on?

--

Go to Step 2

Go to Step 3

2

Repair the short to B+ in CKT 29 between the underhood electrical center 1 terminal F6 and the horn connection terminal B.

Is the repair complete?

--

System OK

--

3

Connect a test lamp from the underhood electrical center 1 terminal E6 to terminal F8.

Does the test lamp light?

--

Go to Step 4

Go to Step 5

4
  1. Ensure that the test lamp is still connected.
  2. Disconnect harness connector C216.

Is the test lamp still on?

--

Go to Step 6

Go to Step 7

5

Replace the horn relay.

Is the repair complete?

--

System OK

--

6
  1. For vehicles without UA6, repair the short to ground in CKT 28 between the underhood electrical center 1 terminal F8 and C216 terminal G.
  2. For vehicles with UA6, ensure that the test lamp is connected.
  3. Disconnect connector C3 from the body control module (BCM).

Is the test lamp still on?

--

Go to Step 8

Go to Step 9

7

Replace the horn switches.

Is the repair complete?

--

System OK

--

8

Repair the short to ground in CKT 28 at one of the following areas:

    • Between the body control module (BCM) connector C3 terminal C9 and C216 terminal G
    • Between C216 terminal G and the underhood electrical center 1.

Is the repair complete?

--

System OK

--

9

Replace the body control module (BCM). Refer to.

Is the repair complete?

--

System OK

--