GM Service Manual Online
For 1990-2009 cars only

Keyless Entry System Inoperative Active

Step

Action

Yes

No

Schematic Reference: Remote Function Schematics

Connector End View Reference: Remote Function Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Does the customer complain about other symptoms related to this, such as poor range when the key fob buttons are pressed or intermittent Tire Pressure Monitoring issues? (It’s possible the RF External Antenna at the RCDLR may have a poor connection.)

Go to Step 3

Go to Step 4

3

Inspect the external RF antenna connection at the RCDLR. First, gently pull on the coax connector at the module. If the coax comes out, then it wasn’t seated properly. Remove and carefully inspect the coax connection for bent blades or a bent center pin. Fix coax connection if necessary and re-seat connector until a "click" is heard. Gently pull on the coax connection to make sure it is seated properly. Was the inspection made?

Go to Step 4

Go to Step 3

4

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 5

5

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

Do the locks operate properly?

Go to Step 6

Go to Symptoms - Vehicle Access

6

Operate the rear compartment release and the fuel door release from the controls inside the vehicle.

Do the rear compartment release and the fuel door release operate properly?

Go to Step 7

Go to Symptoms - Vehicle Access

7

Important: Ensure 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 keyless entry 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 12

Go to Step 8

8

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

Go to Step 11

Go to Step 9

9

Replace the transmitter battery. Refer to Transmitter Battery Replacement.

Did you complete the replacement?

Go to Step 10

--

10

  1. Turn ON the J 43241 .
  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 12

Go to Step 11

11

Replace the keyless entry transmitter. Refer to Transmitter Programming.

Did you complete the replacement?

Go to Step 12

--

12

Perform the programming procedure. Refer to Transmitter Programming.

Did the drivers information center (DIC) beep and display a message ready for next fob?

Go to Step 14

Go to Step 13

13

Replace the remote control door lock receiver (RCDLR). Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 14

--

14

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Keyless Entry System Inoperative Passive

Step

Action

Yes

No

Schematic Reference: Remote Function Schematics

Connector End View Reference: Remote Function Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Approach the vehicle with the keyless entry transmitter and attempt to open each door and the rear compartment.

Do all doors and the rear compartment open?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Do any doors or the rear compartment open?

Go to Step 4

Go to Step 5

4

Important: 

   • The voltage signal sent by the remote control door lock receiver (RCDLR) to the passive antenna is an AC voltage signal. The DMM must be set on AC voltage setting to record the voltage pulse to the passive antenna.
   • Use a DMM to record the voltage pulse using the MIN MAX setting to capture the AC voltage pulse to the passive antenna.

  1. Disconnect the keyless entry antenna at the inoperative door or rear compartment.
  2. With the DMM measure/capture for an AC voltage signal between the keyless entry antenna power circuit and the ground circuit.
  3. With a scan tool, go to the RCDLR special functions menu.
  4. Select and authenticate the affected antenna.

Was an AC voltage signal captured on the DMM?

Go to Step 7

Go to Step 6

5

Test the passive portion of the transmitter:

  1. Turn on the J 43241 Keyless Entry Tester.
  2. Place the transmitter on the J 43241 test pad.
  3. With the J 43241 in hand, approach the vehicle and attempt to open each door and the rear compartment.

Does the J 43241 beep during each entry attempt?

Go to Step 8

Go to Step 9

6

Test the affected antenna's keyless entry antenna signal and low reference circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 8

7

Inspect for poor connections at the affected keyless entry antenna. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 12

8

Inspect for poor connections at the RCDLR. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 14

Go to Step 13

9

Replace the transmitter battery. Refer to Transmitter Battery Replacement .

Did you find and correct the condition?

Go to Step 14

Go to Step 10

10

Replace the keyless entry transmitter. Refer to Transmitter Programming .

Did you complete the replacement?

Go to Step 11

--

11

Important: All transmitters which are to be recognized by the RCDLR must be programmed in a single programming sequence.

Perform the transmitter programming procedure. Refer to Transmitter Programming .

Did the driver information center (DIC) beep and display a message ready for next fob?

Go to Step 14

Go to Step 13

12

Replace the affected keyless entry antenna. Refer to the following procedures: .

Did you complete the replacement?

Go to Step 14

--

13

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

Did you complete the replacement?

Go to Step 14

--

14

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3