GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Remote Keyless Entry System Check?

--

Go to Step 2

Go to Power Door Locks System Check

2

Press the horn pad on the steering wheel.

Does the horn sound?

--

Go to Step 3

Go to Horns System Check

3

Verify the operation of the exterior lights.

Do the exterior lights function properly?

--

Go to Step 4

Go to Exterior Lights System Check

4

Is the panic function inoperative from both transmitters?

--

Go to Step 5

Go to Step 11

5

Are only the horns inoperative when the panic function is active?

--

Go to Step 6

Go to Step 8

6

Inspect CKT 28 (BLK) for an open between the RFA module and the horn relay.

Was an open found?

--

Go to Step 7

Go to Step 12

7

Repair the open in CKT 28 (BLK).

Is the repair complete?

--

Go to Step 13

--

8

Are only the exterior lights inoperative when the panic function is active?

--

Go to Step 9

Go to Step 12

9

Inspect CKT 624 (BLK/WHT) for an open between the RFA module and the lamp control module (LCM).

Was an open found?

--

Go to Step 10

Go to Step 12

10

Repair the open in CKT 624 (BLK/WHT).

Is the repair complete?

--

Go to Step 13

--

11

Replace the transmitter. Refer to Transmitter Programming

Is the repair complete?

--

Go to Step 13

12

Replace the RFA module. Refer to Remote Control Door Lock Receiver Replacement

Is the repair complete?

--

Go to Step 13

13

  1. Ensure that any components removed during diagnosis are installed.
  2. Ensure that any connectors are connected.

Is the repair complete?

--

Go to Power Door Locks System Check

--