GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Remote Function Schematics

Connector End View Reference: Remote Function Connector End Views

DEFINITION: Use this diagnostic chart when the door unlock function is inoperative when using the keyless entry transmitter. All other keyless entry functions operate normally.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Press the door unlock button on the transmitter.

Do the door locks operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Operate the door locks from the controls inside the vehicle.

Do the door locks operate normally?

Go to Step 4

Go to Diagnostic System Check - Vehicle

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 door unlock button of the transmitter.

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

Go to Step 5

Go to Step 7

5

Test the body control module (BCM) portion of the lock relay control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 9

Go to Step 6

6

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Replace the transmitter. Refer to Transmitter Programming .

Did you complete the replacement?

Go to Step 9

--

8

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 9

--

9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3