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 Power Door Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2

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

Did you find and correct the condition?

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Go to Step 14

Go to Step 3

3

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select RH DCM display DTC function on the scan tool.

Does the scan tool display DTC B2237, B2239, or B2277 as history?

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Go to Diagnostic Trouble Code (DTC) List/Type

Go to Step 4

4

With a scan tool, command the RH DCM to LOCK and UNLOCK the RH door.

Does the RH door LOCK and UNLOCK with each command?

--

Go to Step 6

Go to Step 5

5

  1. Turn OFF the ignition.
  2. Disconnect the RH door lock motor connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between both RH door lock control circuits
  5. With a scan tool, command the RH DCM to LOCK and UNLOCK the RH door.

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

--

Go to Step 11

Go to Step 8

6

  1. Activate the RH door lock switch.
  2. With a scan tool, observe the RH Door Lock Switch parameter in the RH DCM data list.

Does the RH Door Lock Switch parameter change state?

--

Go to Step 7

Go to Step 9

7

  1. Activate the RH door unlock switch.
  2. With a scan tool, observe the RH Door Unlock Switch parameter in the RH DCM data list.

Does the Door Unlock Switch parameter change state?

--

Go to Step 12

Go to Step 10

8

Test the RH door lock control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 14

Go to Step 12

9

Test the RH door lock switch signal and ground circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 14

Go to Step 13

10

Test the RH door unlock switch signal and ground circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 14

Go to Step 13

11

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

Did you complete the replacement?

--

Go to Step 14

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12

Replace the RH DCM. Refer to Door Control Module Replacement .

Did you complete the replacement?

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Go to Step 14

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13

Replace the RH door switch. Refer to Front Door Switch Replacement .

Did you complete the replacement?

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Go to Step 14

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14

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2