GM Service Manual Online
For 1990-2009 cars only

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. This step verifies that the keyless entry serial data circuit is at B+ supplied by the BCM.

  1. This step tests for a short to voltage which would not be detected with a DMM in step 16.

Step

Action

Value(s)

Yes

No

1

Did you perform the Remote Keyless Entry Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Remote Keyless Entry

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 in Wiring Systems

Go to Step 3

3

Lock and unlock the door locks using the lock switches inside the vehicle.

Do the locks operate properly?

--

Go to Step 4

Go to Diagnostic Starting Point in Doors

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. Refer to Transmitter Battery Replacement .

Did you complete the replacement?

--

Go to Step 7

--

7

  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 8

8

Replace the transmitter.

Did you complete the replacement?

--

Go to Step 12

--

9

Press the PANIC button on the transmitter.

Does the PANIC function operate normally?

--

Go to Step 10

Go to Step 12

10

Perform the synchronization procedure. Refer to Transmitter Synchronization .

Do the locks cycle to lock then unlock?

--

Go to Step 11

Go to Step 12

11

Operate the transmitter within range of the vehicle.

Do all of the Remote Keyless Entry functions operate normally?

--

Go to Step 25

Go to Step 12

12

Important:  All transmitters which are to be recognized by the Remote Control Door Lock Receiver must be programmed in a single programming sequence. If the system is placed in program mode it will erase all previously programmed transmitters upon the receipt of the programming signal from the first transmitter. Perform the programming procedure. Refer to Transmitter Programming .

Do the locks cycle to lock the unlock?

--

Go to Step 25

Go to Step 13

13

  1. Turn OFF the ignition.
  2. Disconnect the Remote Control Door Lock Receiver.
  3. Probe the battery positive voltage circuit of the Remote Control Door Lock Receiver with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

--

Go to Step 14

Go to Step 23

14

Connect a test lamp between the ground circuit of the Remote Control Door Lock Receiver and the battery positive voltage circuit of the Remote Control Door Lock Receiver.

Does the test lamp illuminate?

--

Go to Step 15

Go to Step 24

15

  1. Disconnect the test lamp.
  2. Turn ON the ignition, with the engine OFF.
  3. Measure the voltage between the keyless entry serial data circuit and the ground circuit of the Remote Control Door Lock Receiver.

Does the voltage measure within the specified range?

B+

Go to Step 16

Go to Step 18

16

  1. Turn ON the ignition, with the engine OFF.
  2. Probe the keyless entry serial data circuit of the Remote Control Door Lock Receiver with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

--

Go to Step 17

Go to Step 19

17

Test the keyless entry serial data circuit for a short to voltage.

Did you find and correct the condition?

--

Go to Step 25

Go to Step 20

18

Test the keyless entry serial data circuit for an open, high resistance, or short to ground.

Did you find and correct the condition?

--

Go to Step 25

Go to Step 20

19

Inspect for poor connections at the harness connector of the Remote Control Door Lock Receiver. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 25

Go to Step 21

20

Inspect for poor connections at the harness connector of the Body Control Module. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 25

Go to Step 22

21

Important: All transmitters which are to be recognized by the Remote Control Door Lock Receiver must be programmed in a single programming sequence. If the system is placed in program mode it will erase all previously programmed transmitters upon the receipt of the programming signal from the first transmitter. Refer to Transmitter Programming .

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

Did you complete the replacement?

--

Go to Step 25

--

22

Important: Replacement of the Body Control Module will require a setup procedure to be performed. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

--

Go to Step 25

--

23

Repair the open, high resistance, or short to ground in the battery feed circuit of the Remote Control Door Lock Receiver. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 25

--

24

Repair the open or high resistance in the ground circuit of the Remote Control Door Lock Receiver. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 25

--

25

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3