GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Has the Content Theft Deterrent (CTD) System Check been performed?

--

Go to Step 2

Go to Content Theft Deterrent (CTD) System Check

2

  1. Turn the ignition switch to ON.
  2. • Install the scan tool.
    • Select the driver door module.
    • Select the data display.
    • Select the inputs.
  3. Operate the LH front door lock cylinder switch.

Does the scan tool show an input for the front door lock switch?

--

Go to Step 3

Go to Step 4

3

Replace the Rear Integration Module (RIM). Refer to Body Control Module Replacement in Body Control Systems.

Is the repair complete?

--

Go to Content Theft Deterrent (CTD) System Check

--

4

  1. Disconnect connector C2 of the malfunctioning front door lock cylinder switch.
  2. Use a DMM in order to measure resistance of the front door lock cylinder switch, connector C2, terminals K and A.
  3. Operate the malfunctioning door lock cylinder switch.

Is the resistance within the specified range?

0-5 ohms

Go to Step 5

Go to Step 6

5

Replace the LH front door module (LFDM) . Refer to Door Control Module Replacement in Doors.

Is the repair complete?

--

Go to Content Theft Deterrent (CTD) System Check

--

6

Test for an open or short to ground in CKT 262 LT/GRN.

Is the circuit OK?

--

Go to Step 8

Go to Step 7

7

Repair the open or short to ground in CKT 262 LT/GRN.

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Content Theft Deterrent (CTD) System Check

--

8

Test for an open or short to ground in CKT 351 BLK/WHT.

Is the circuit OK?

--

Go to Step 10

Go to Step 9

9

Repair the open or short to ground in CKT 351 BLK/WHT.

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Content Theft Deterrent (CTD) System Check

--

10

Replace the malfunctioning front door lock cylinder switch. Refer to Door Lock Cylinder Replacement in Doors.

Is the repair complete?

--

Go to Content Theft Deterrent (CTD) System Check

--