GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Theft Deterrent Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

2

  1. Turn ON the ignition with the engine OFF.
  2. With a scan tool, observe the door key switch parameter in the Body Control Module (BCM) data list.

Does the scan tool display INACTIVE?

INACTIVE

Go to Step 3

Go to Step 11

3

  1. Turn OFF the ignition.
  2. With a scan tool, observe the door key switch parameter in the BCM data list.
  3. Insert the ignition key into the drivers door lock cylinder.
  4. Turn and hold the door lock cylinder to the UNLOCK position.

Does the scan tool display ACTIVE?

ACTIVE

Go to Step 6

Go to Step 4

4

  1. Insert the ignition key into the passenger door lock cylinder.
  2. With a scan tool, observe the door key switch parameter in the BCM data list.
  3. Turn and hold the door lock cylinder to the UNLOCK position.

Does the scan tool display ACTIVE?

ACTIVE

Go to Step 9

Go to Step 5

5

  1. Connect a 3 amp fused jumper wire between the signal circuit of the door key switch and ground.
  2. With a scan tool, observe the door key switch parameter in the BCM data list.

Does the scan tool display ACTIVE?

ACTIVE

Go to Step 18

Go to Step 22

6

  1. Insert the ignition key into the passenger door lock cylinder.
  2. With a scan tool, observe the door key switch parameter in the BCM data list.
  3. Turn and hold the door lock cylinder to the UNLOCK position.

Does the scan tool display ACTIVE?

ACTIVE

System OK

Go to Step 7

7

  1. Disconnect the RH mini-wedge connector C3.
  2. With a scan tool, observe the Door Key Switch parameter.
  3. Connect a 3 amp fused jumper wire between the signal circuit of the door key switch and ground.

Does the scan tool display ACTIVE?

ACTIVE

Go to Step 8

Go to Step 20

8

  1. Connect a 3 amp fused jumper wire between the signal circuit of the door key switch and the ground circuit at the RH mini-wedge connector C3.
  2. With the scan tool, observe the Door Key Switch parameter.

Does the scan tool display ACTIVE?

ACTIVE

Go to Step 19

Go to Step 21

9

  1. Disconnect the LH mini-wedge connector C3.
  2. With a scan tool, observe the Door Key Switch parameter.
  3. Connect a 3 amp fused jumper wire between the signal circuit of the door key switch and ground.

Does the scan tool display the specified ACTIVE?

ACTIVE

Go to Step 10

Go to Step 15

10

  1. Connect a 3 amp fused jumper wire between the signal circuit of the door key switch and the ground circuit at the LH mini-wedge connector C3.
  2. With the scan tool, observe the Door Key Switch parameter.

Does the scan tool display ACTIVE?

ACTIVE

Go to Step 17

Go to Step 16

11

  1. With a scan tool observe the Door Key Switch parameter.
  2. Disconnect the BCM connector C3.

Does the scan tool display INACTIVE?

INACTIVE

Go to Step 12

Go to Step 22

12

  1. Reconnect the BCM connector C3.
  2. Disconnect the LH mini-wedge connector C3.
  3. With a scan tool observe the Door Key Switch parameter.

Does the scan tool display INACTIVE?

INACTIVE

Go to Step 17

Go to Step 13

13

  1. Disconnect the RH mini-wedge connector C3.
  2. With a scan tool observe the Door Key Switch parameter.

Does the scan tool display INACTIVE?

INACTIVE

Go to Step 19

Go to Step 14

14

Repair the short to ground in the signal circuit of the door key switch between the BCM and either mini-wedge.

Did you complete the repair?

--

Go to Step 23

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15

Repair the open in the signal circuit of the door key switch between the LH mini-wedge and C200.

Did you complete the repair?

--

Go to Step 23

--

16

Repair the open in the signal circuit of the door key switch between the LH mini-wedge and G203.

Did you complete the repair?

--

Go to Step 23

--

17

Replace the LH mini-wedge.

Did you complete the replacement?

--

Go to Step 23

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18

Repair the open in the signal circuit of the door key switch between the BCM and C200.

Did you complete the repair?

--

Go to Step 23

--

19

Replace the RH mini-wedge.

Did you complete the replacement?

--

Go to Step 23

--

20

Repair the open in the signal circuit of the door key switch between the RH mini-wedge and C200.

Did you complete the repair?

--

Go to Step 23

--

21

Repair the open in the signal circuit of the door key switch between the mini-wedge and G200.

Did you complete the repair?

--

Go to Step 23

--

22

  1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System.
  2. Program the BCM with the proper calibrations. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.
  3. Perform the learn procedure.

Did you complete the replacement?

--

Go to Step 23

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23

  1. Reconnect any connectors that were removed for testing.
  2. Clear any DTCs that may have been set during this procedure.
  3. Attempt to set the CTD system. Refer to Content Theft Deterrent (CTD) Circuit Description .

Does the system work as described?

--

System OK

Go to Diagnostic System Check - Theft Deterrent