GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Body Control Module (BCM) System Check performed?

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Go to Step 2

Diagnostic System Check - Body Control System

2

  1. Remove the key from the ignition key lock cylinder.
  2. Close all of the vehicle doors.
  3. While observing the door locks, press LOCK, then press UNLOCK on the driver door lock switch.
  4. While observing the door locks, press LOCK, then press UNLOCK on the driver door lock switch.

Do all of the doors lock and unlock when using either door lock switch?

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Go to Step 3

Go to Automatic Door Locks System Check

3

Resynchronize the transmitters:

  1. Press and hold, for at least 7 seconds, both the LOCK and the UNLOCK buttons on the keyless entry transmitter. Repeat this procedure using the other transmitter.
  2. Remove the key from the ignition key cylinder lock.
  3. Disable the power sliding door (PSD) lockout switch. This switch is located in the overhead console.
  4. Close all of the vehicle doors.
  5. While observing the door locks, press once on the LOCK button on the keyless entry transmitter.
  6. While observing the door locks, press twice on the UNLOCK button on the keyless entry transmitter.
  7. While observing the PSD, press once on the PSD open/close button (if equipped) on the keyless entry transmitter.
  8. While observing the exterior lights and while listening to the horn, press the alarm button (if equipped) on the keyless entry transmitter.

Does the keyless entry system operate the door locks and the optional alarm?

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Go to Step 10

Go to Step 4

4

  1. Remove the transmitter batteries.
  2. Using a J 39200 , measure the voltage on each transmitter battery.

Is the voltage within the specified range?

3.0-3.5 V

Go to Step 5

Go to Step 12

5

  1. Reprogram all of the transmitters. Refer to Transmitter Programming .
  2. Remove the key from the ignition key cylinder lock.
  3. Close all of the vehicle doors.
  4. While observing the door locks, press once on the LOCK button on the keyless entry transmitter.
  5. While observing the door locks, press twice on the UNLOCK button on the keyless entry transmitter.
  6. While observing the power sliding door, press once on the PSD open/close button (if equipped) on the keyless entry transmitter.
  7. While observing the exterior lights and while listening to the horn, press the alarm button (if equipped) on the keyless entry transmitter.

Does the keyless entry system operate the door locks and the optional alarm and optional PSD?

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Go to Step 18

Go to Step 6

6

  1. Program a known good transmitter. Refer to Transmitter Programming .
  2. Remove the key from the ignition key cylinder lock.
  3. Close all of the vehicle doors.
  4. While observing the door locks, press once on the lock button on the keyless entry transmitter.
  5. While observing the door locks, press twice on the unlock button on the keyless entry transmitter.
  6. While observing the power sliding door, press once on the PSD open/close button (if equipped) on the keyless entry transmitter.
  7. While observing the exterior lights and while listening to the horn, press the alarm button (if equipped) on the keyless entry transmitter.

Does the keyless entry system operate the door locks and the optional alarm and optional PSD?

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Go to Step 13

Go to Step 7

7

Test the RADIO fuse. The RADIO fuse is located in the underhood accessory wiring junction block.

Is the RADIO fuse open?

--

Go to Step 8

Go to Step 9

8

  1. Replace the RADIO fuse.
  2. Test the RADIO fuse again.

Is the RADIO fuse open?

--

Go to Step 14

Go to Step 9

9

  1. Disconnect the remote control door lock receiver (RCDLR).
  2. Using a test lamp, connect between the RCDLR harness connector terminal A and terminal C.

Did the test lamp light?

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Go to Step 15

Go to Step 11

10

The keyless entry system is operational. Refer to Circuit Description for more information about the operation of the keyless entry.

Is the action complete?

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Go to Step 18

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11

Using a test lamp, connect between the RCDLR harness connector terminal C and ground.

Did the test lamp light?

--

Go to Step 16

Go to Step 17

12

Replace the transmitter batteries.

Is the repair complete?

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Go to Step 3

-

13

Replace the defective transmitter.

Is the repair complete?

--

Go to Step 5

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14

Repair a short to ground in CKT 640.

Is the repair complete?

--

Go to Step 5

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15

  1. Test for a poor connector terminal contact at the RCDLR.
  2. If the connection is OK, replace the RCDLR. Refer to Receiver Replacement .

Is the repair complete?

--

Go to Step 5

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16

Repair a poor connection or an open to CKT 1550.

Is the repair complete?

--

Go to Step 5

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17

Repair a poor connection or an open to CKT 640.

Is the repair complete?

--

Go to Step 5

--

18

  1. Turn the ignition switch to the LOCK position.
  2. Reinstall all of the connectors/components that you removed.
  3. Turn the ignition switch to the RUN position for 6 seconds.
  4. Turn the ignition switch to the LOCK position.
  5. Remove the BCM PRGRM fuse.
  6. Turn the ignition switch to the ACC position. (The BCM sounds the chime a number of times equivalent to the BCM type installed on the vehicle).
  7. Within 1 second, turn the ignition switch from the ACC position, to the LOCK position, then back to the ACC position. (The BCM sounds any DTCs stored).

Are any BCM DTC present?

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Diagnostic System Check - Body Control System

System OK