GM Service Manual Online
For 1990-2009 cars only

Automatic Door Locks - Unlock Inoperative Both Switches

Step

Action

Value(s)

Yes

No

1

Was the Automatic Door Locks Diagnostic System Check performed?

--

Go to Step 2

Go to Automatic Door Locks System Check

2

  1. Turn the ignition switch off.
  2. Disconnect the Body Control Module (BCM) connector C1.
  3. Using a DMM, measure the resistance between the BCM harness connector C1 terminal D13 and ground.

Is the resistance within the specified range?

Go to Step 3

Go to Step 4

3

  1. Disconnect the LF or RF door lock switch.
  2. Using a DMM, measure the resistance between the BCM harness connector C1 terminal D13 and either LF or RF door lock switch harness connector terminal B (LF) or C (RF).

Is the resistance within the specified range?

Less than 2ohms

Go to Step 5

Go to Step 6

4

Repair short to ground in circuit 781.

Is the repair complete?

--

Go to Step 7

--

5

  1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System for service procedures.
  2. After BCM replacement, perform the Setup New BCM procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Is the repair complete?

--

Go to Step 7

--

6

Repair poor connection or open in circuit 781.

Is the repair complete?

--

Go to Step 7

--

7

  1. Turn the ignition switch off.
  2. Reinstall connectors/components removed.

Is the action complete?

--

Go to Automatic Door Locks System Check

--

Automatic Door Locks - Unlock Inoperative One Switch

Step

Action

Value(s)

Yes

No

1

Was the Automatic Door Locks Diagnostic System Check performed?

--

Go to Step 2

Go to Automatic Door Locks System Check

2

  1. Turn the ignition switch off.
  2. Disconnect the inoperative door lock switch.
  3. Using a DMM, connect between door lock switch terminals (switch side):
  4. • Driver's side door lock switch: B and F.
    • Passenger side door lock switch: C and F.
  5. While measuring the resistance using DMM, press lock on the door lock switch.

Is the resistance within the specified range?

Unlock Position:

Less than 2 ohms

Released:

Go to Step 3

Go to Step 4

3

Repair poor connection or open in circuit 781.

Is the repair complete?

--

Go to Step 5

--

4

Replace the door lock switch. Refer to Door Lock and Side Window and Outside Rearview Mirror Remote Control Switch Replacement in Doors for service procedure.

Is the repair complete?

--

Go to Step 5

--

5

  1. Turn the ignition switch off.
  2. Reinstall connectors/components removed.
  3. Is the action complete?

--

Go to Automatic Door Locks System Check

--