GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Press each button of the transmitter one at a time.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Lock and unlock the door locks using the controls inside the vehicle.

Do the locks operate properly?

Go to Step 4

Go to Power Door Locks Inoperative

4

    Important: Inspect that the keyless entry transmitter is the correct model for the vehicle remote system. A wrong model transmitter may pass this test, but will not activate the vehicle remote system.

  1. Turn ON the J 43241 Keyless Entry Tester.
  2. Place the transmitter on the J 43241 test pad.
  3. Press each button of the transmitter one at a time.

Does a tone sound and the green light illuminate on the J 43241 after each button is pressed?

Go to Step 9

Go to Step 5

5

Do any of the buttons on the transmitter sound the tone and illuminate the green light when pressed?

Go to Step 8

Go to Step 6

6

Replace the transmitter battery.

Did you complete the replacement?

Go to Step 7

--

7

  1. Turn the J 43241 ON.
  2. Place the transmitter on the J 43241 .
  3. Press each button of the transmitter one at a time.

Does a tone sound and the green light illuminate on the J 43241 after each button is pressed?

Go to Step 9

Go to Step 8

8

Replace the transmitter.

Did you complete the replacement?

Go to Step 11

--

9

Perform the synchronization procedure. Refer to Transmitter Synchronization .

Did the locks cycle and the park lamps flash?

Go to Step 10

Go to Step 11

10

Operate the transmitter within range of the vehicle.

Do all of the remote functions operate normally?

Go to Step 13

Go to Step 11

11

Perform the programming procedure. Refer to Transmitter Synchronization .

Did the locks cycle to lock then unlock?

Go to Step 13

Go to Step 12

12

Important: When replacing the intelligent switching unit (ISU), perform the programming procedure.

Replace the ISU.

Did you complete the replacement?

Go to Step 13

--

13

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3