GM Service Manual Online
For 1990-2009 cars only

Object Number: 97673  Size: MF

DTC B2277 -- Door Lock Motor/Mirror Heater -- Fault -- DCM-right

Step

Action

Value(s)

Yes

No

1

Does the right door LOCK and UNLOCK correctly?

Go to Step 2

Go to Step 8

2

  1. Disconnect the right heated outside rearview mirror connector C1.
  2. Measure the voltage between the right heated outside rearview mirror connector C1 terminal E and ground.
  3. Turn ON the rear defogger.

Is the voltage within the specified range?

10.0-14.0V

Go to Step 3

Go to Step 5

3

  1. Turn ON the rear defogger.
  2. Measure the voltage between the right heated outside rearview mirror connector C1 terminal B and terminal E.

Is the voltage within the specified range?

10.0-14.0V

Go to Step 4

Go to Step 7

4

Replace the right heated outside rearview mirror.

Is the replacement complete?

Recheck the System Operation

5

Using a scan tool check if the right door is receiving the command to turn ON the right heated outside rearview mirror

is the command being received?

Go to Step 6

Recheck the System Operation

6

  1. Check for an open in CKT 267 between the right heated outside rearview mirror connector C1 terminal E and right Door Control Module Connector C3 terminal B.
  2. If OK, replace the right Door Control Module (DCM).

Is the replacement completed?

Recheck the System Operation

7

  1. Check for an open in CKT 450 between the right heated outside rearview mirror connector C1 terminal B and the right Door Control Module (DCM) connector C3 terminal F.
  2. If OK, Replace the right Door Control Module (DCM).

Is the repair complete?

Recheck the System Operation

8

Is there any mechanical binding?

Recheck the System Operation

Go to Step 9

9

  1. Disconnect the right door lock connector C3.
  2. Measure the voltage between the right door lock connector C3 terminal A and terminal B.
  3. Press the right door lock switch to LOCK and UNLOCK.

Is the volage in the specified range in LOCK and UNLOCK?

10.0-14.0V

Go to Step 10

Go to Step 11

10

Replace the right door lock.

Is the replacement complete?

Recheck the System Operation

11

  1. Check for an open in CKT 294 or CKT 295 between the right door lock and the right Door Control Module (DCM).
  2. If OK, replace the right Door Control Module (DCM).

Is the repair complete?

Recheck the System Operation