GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check for the horn system?

Go to Step 2

Go to Diagnostic System Check - Horns

2

Verify the fault is present.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Test for the ground circuit and the feed circuit of the dual horn assembly for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 4

4

Inspect for poor connections at the dual horn assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 5

5

Inspect the dual horn assembly for inadequate torque or debris in the joint where it attaches to the vehicle. Refer to Fastener Tightening Specifications for torque specifications.

Did you find and correct the condition?

Go to Step 7

Go to Step 6

6

Replace the dual horn assembly. Refer to Horn Replacement .

Did you complete the replacement?

Go to Step 7

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7

Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2