GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did the Horn System Check bring you here?

--

Go to Step 2

Go to Horns System Check

2

Remove the horn relay.

Do the horn(s) turn off?

--

Go to Step 3

Go to Step 4

3

Connect a DMMJ 39200 from the horn relay CKT 28 (BLK) cavity H6 to ground.

Is their continuity?

--

Go to Step 6

Go to Step 5

4

Repair the short to battery voltage in CKT 29 (DK GRN) between the convenience center and the horn(s).

Is the repair complete?

--

Go to Horns System Check

--

5

Replace the horn relay. Refer to Horn Replacement .

Is the repair complete?

--

Go to Horns System Check

--

6

  1. Disconnect the horn switch connector.
  2. Use an ohmmeter in order to probe cavity H6 at the convenience center to ground.

Did you find continuity?

--

Go to Step 8

Go to Step 7

7

Repair the short to ground in CKT 28 (BLK) in the following locations:

    • Between the horn switch and the convenience center
    • In the horn brush/horn slip ring

Is the repair complete?

--

Go to Horns System Check

--

8

Replace the horn switch.

Is the repair complete?

--

Go to Horns System Check

--