GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 Regal 🢒 Body and Accessories 🢒 Doors 🢒 Power Door Locks Inoperative - One Motor

Step

Action

Value(s)

Yes

No

1

Was the Door Locks System Inspect performed?

--

Go to Step 2

Go to Power Door Locks System Check

2

Did you perform the BCM diagnostic system check?

--

Go to Step 3

Go to Diagnostic System Check - Body Control System

3

Is the door lock actuator that is inoperative the driver door?

--

Go to Step 4

Go to Step 5

4
  1. Disconnect the drivers side door lock actuator motor electrical connector C2.
  2. Connect a test light between the drivers side door lock actuator motor harness connector C2 terminals A and B.
  3. Momentarily, press unlock on either door lock switch while observing the test light.

Does the test light flash once?

--

Go to Step 8

Go to Step 9

5

Are all the passenger doors inoperative?

--

Go to Step 6

Go to Step 7

6

Use a test light in order to probe between B+ and the BCM connector C4 terminal H.

Is the test light on?

--

Go to Step 14

Go to Step 15

7
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the electrical connector C2 of the inoperative door lock actuator motor.
  3. Use a test light in order to connect between the inoperative door lock actuator motor harness connector C2 terminals A and B.
  4. While observing the test light, press lock on either door lock switch.

Does the test light flash once while pressing lock?

--

Go to Step 17

Go to Step 18

8

Replace the drivers side door lock actuator motor.

Is the repair complete?

--

System Ok

--

9

Connect a test light between B+ and the drivers side door lock actuator motor harness connector terminal B.

Does the test light illuminate?

--

Go to Step 10

Go to Step 11

10

Connect a test light between B+ and the drivers side door lock actuator motor harness connector terminal A.

Does the test light illuminate?

--

Go to Step 13

Go to Step 12

11

Repair a poor connection or open in CKT 295.

Is the repair complete?

--

System Ok

--

12
  1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System.
  2. Perform setup procedure for the new BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Is the repair complete?

--

System Ok

--

13

Repair a poor connection or open in CKT 694.

Is the repair complete?

--

Go to Step 17

--

14
  1. Use a test light in order to connect by probing between the BCM connector C4 terminal H and ground.
  2. While observing the test light, press unlock momentarily on either door lock switch.

While pressing unlock, does the test light flash?

--

Go to Step 16

Go to Step 15

15
  1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System.
  2. Perform the Setup New BCM procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Is the repair complete?

--

System Ok

--

16

Repair a poor connection or open in circuit 294.

Is the repair complete?

--

System Ok

--

17

Replace the door lock actuator motor. Refer to Front Side Door Lock Actuator Replacement (Front Door) or Rear Side Door Lock Actuator Replacement (Rear Door)

Is the repair complete?

--

System Ok

--

18
  1. Use a test light in order to connect between the inoperative door lock actuator motor harness connector C2 terminal A and ground.
  2. While observing the test light, press unlock on either door lock switch.

Does the test light flash once while pressing unlock?

--

Go to Step 19

Go to Step 20

19

Repair a poor connection or open in circuit 295.

Is the repair complete?

--

Go to Step 17

--

20

Repair a poor connection or open in circuit 294.

Is the repair complete?

--

Go to Step 17

--