GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Important: Horns may be turned off in feature customization. Refer to Feature Customization .

1

  1. Disconnect the Body Control Module (BCM) connector C3.
  2. Connect a test lamp between B+ and the BCM connector C3 terminal C9.
  3. Press the horn switch on the steering wheel.

Does the test lamp light?

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Go to Step 2

Go to Step 3

2

  1. Test for a poor connection at BCM connector C3 terminal C9.
  2. If the connection is OK, replace the BCM. Refer to Body Control Module Replacement in Body Control Systems.

Is the repair complete?

--

System OK

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3

Repair the open in circuit 28 between the BCM C9 terminal C9 and connector C216 terminal G.

Is the repair complete?

--

System OK

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