GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Horns System Check?

--

Go to Step 2

Go to Horns System Check

2

Remove the horn relay from the underhood fuse block.

Does the horn stop sounding?

--

Go to Step 4

Go to Step 3

3

Locate and Repair the short to B+ in CKT 29 (DK GRN) between the underhood fuse block and the left horn or the right horn (if equipped). Refer to Wiring Repairs in wiring.

Is the repair complete?

--

Go to Horns System Check

--

4

Connect a J 39200 between cavities D1 and C3 of the horn relay.

Is there continuity?

--

Go to Step 5

Go to Step 6

5

Replace the horn relay.

Is the repair complete?

--

Go to Horns System Check

--

6

  1. Disconnect C100.
  2. Connect a J 39200 from the underhood fuse block cavity C1 to B+.

Is there battery voltage?

--

Go to Step 7

Go to Step 8

7

Locate and Repair the short to ground in CKT   28 (BLK) between C100 and the underhood fuse block. Refer to Wiring Repairs in wiring.

Is the repair complete?

--

Go to Horns System Check

--

8

  1. Reconnect connector C100.
  2. Disconnect connector C210 at the convenience center.
  3. Connect a J 39200 from the underhood fuse block cavity  C1 to B+.

Is there battery voltage?

--

Go to Step 12

Go to Step 9

9

  1. Reconnect C210.
  2. Disconnect the remote control door lock receiver.
  3. Connect a J 39200 from cavity C1 of underhood fuse block to B+.

Is there battery voltage?

--

Go to Step 10

Go to Step 11

10

Locate and repair the short to ground in CKT 28 (BLK) between C210 and remote control door lock receiver. Refer to Wiring Repairs in wiring.

Is the repair complete?

--

Go to Horns System Check

--

11

Replace remote control door lock receiver. Refer to Remote Control Door Lock Receiver Replacement in doors.

Is the repair complete?

--

Go to Horns System Check

--

12

  1. Disconnect C266.
  2. Connect a J 39200 from the underhood fuse block cavity C1 to B+.

Is there battery voltage?

--

Go to Step 13

Go to Step 14

13

Locate and repair the short to ground in CKT 28 (BLK) between C100, C266 or C210. Refer to Wiring Repairs in wiring.

Is the repair complete?

--

Go to Horns System Check

--

14

  1. Disconnect the horn switch.
  2. Connect a J 39200 from C266 cavity A11 to B+.

Is there battery voltage?

--

Go to Step 15

Go to Step 16

15

Locate and repair the short to ground in CKT 28 (BLK) between C266 and the horn switch. Refer to Wiring Repairs in wiring.

Is the repair complete?

--

Go to Horns System Check

--

16

Replace the horn switch.

Refer to Horn Switch Replacement - On Vehicle in Steering.

Is the repair complete?

--

Go to Horns System Check

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