GM Service Manual Online
For 1990-2009 cars only

RH Door Lock Inoperative

Step

Action

Value(s)

Yes

No

DEFINITION: The RH door lock does not LOCK or UNLOCK from the RH door lock switch.

1

Were you sent here from the DCM Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2

Check if any of the following DTCs are stored in the RDCM as history:

    • DTC B2237
    • DTC B2239
    • DTC B2277

Are any of these DTCs stored as history?

--

Go to the Applicable Table

Go to Step 3

3

Check the RH door lock for mechanically malfunctions (binding or bent lock rod, obstructions, etc.).

Was a problem found and repaired?

--

Go to Step 14

Go to Step 4

4

Using a scan tool, select RDCM and command the RH door to LOCK and UNLOCK the RH door.

Does the RH door LOCK and UNLOCK?

--

Go to Step 6

Go to Step 5

5

  1. Turn OFF the ignition switch.
  2. Disconnect the RH door lock motor connector.
  3. Turn ON the ignition switch.
  4. At the RH door lock motor connector (harness side), connect a test light between terminals A and B.
  5. Using a scan tool, command the RH door to LOCK and UNLOCK the RH door.

Does the test light turn ON and OFF with each command?

--

Go to Step 11

Go to Step 8

6

  1. Using a scan tool, select RDCM inputs and monitor the RH door LOCK switch status.
  2. Press the RH door LOCK switch.

Does the scan tool display ACTIVE?

--

Go to Step 7

Go to Step 9

7

  1. Using a scan tool, select RDCM inputs and monitor the RH door UNLOCK switch status.
  2. Press the RH door UNLOCK switch.

Does the scan tool display ACTIVE?

--

System OK

Go to Step 10

8

Check for an open or short to ground in CKT 294 or CKT 295.

Was a problem found and repaired?

--

Go to Step 14

Go to Step 12

9

Check for an open in CKT 781 or CKT 150.

Was a problem found and repaired?

--

Go to Step 14

Go to Step 13

10

Check for an open in CKT 780 or CKT 150.

Was a problem found and repaired?

--

Go to Step 14

Go to Step 13

11

Replace the RH door lock motor. Refer to Door Lock Replacement .

Is the replacement complete?

 

Go to Step 14

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12

  1. Replace the RDCM. Refer to Door Control Module Replacement .
  2. Program the replacement DCM (hardtop only). Refer to Door Control Module Programming/RPO Configuration .

Is the replacement complete?

--

Go to Step 14

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13

Replace the RH door switch assembly. Refer to Door Lock Switch Replacement .

Is the replacement complete?

--

Go to Step 14

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14

  1. Turn OFF the ignition switch.
  2. Reconnect or install any connectors or components that were disconnected or removed.
  3. Turn ON the ignition switch.
  4. Clear any DTCs. Refer to Diagnostic Trouble Code (DTC) Clearing .

Is the repair complete?

--

System OK

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