GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Diagnostic System Check performed?

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Go to Step 2

Go to Horns System Check

2

  1. Disconnect the inoperative horn.
  2. Connect a test lamp between CKT 1329 (DK GRN) and ground.
  3. Press the horn button.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Repair the open in CKT 1329 (DK GRN) between the Underhood Fuse Block cavity A6 and the inoperative horn. Refer to Wiring Repairs

Is the repair complete?

--

Go to Horns System Check

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4

Using a test lamp connected to power probe horn connector cavity A.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

Replace the inoperative horn. Refer to Horn Replacement - Left Side Horn Replacement - Right Side

Is the repair complete?

--

Go to Horns System Check

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6

Repair the open in CKT 150/250 (BLK). Refer to Wiring Repairs

Is the repair complete?

--

Go to Horns System Check

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