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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 726 (Theft Deterrent System) >> Diagnostic Information and Procedures >> Content Theft Deterrent (CTD) Does Not Disarm with Key Lock

Content Theft Deterrent (CTD) Does Not Disarm with Key Lock

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Content Theft Deterrent (CTD) Does Not Disarm with Key Lock

Step Action Value(s) Yes No
Schematic Reference: Theft Deterrent System Schematics 
Connector End View Reference: Theft Deterrent System Connector End Views  
1 Did you perform the Theft Deterrent Diagnostic System Check? - 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) security 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 8  Go to Step 18 
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 door key switch connector.
  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 door key switch connector.
  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 door key switch connector.
  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 door key switch connector.
  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 containing the circuits to the door key switch.
Does the scan tool display INACTIVE?		 INACTIVE Go to Step 12  Go to Step 22 
12
  1. Reconnect the BCM connector.
  2. Disconnect the LH door key switch connector.
  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 door key switch connector.
  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 door latch.
Did you complete the repair?		 - Go to Step 23  -
15 Repair the open in the signal circuit of the door key switch between the LH door latch and C200.
Did you complete the repair?		 - Go to Step 23  -
16 Repair the open in the ground circuit of the door key switch between the LH door key switch connector and G203.
Did you complete the repair?		 - Go to Step 23  -
17 Replace the LH door latch. Refer to LOCK ACTUATOR REPLACEMENT - FRONT DOOR .
Did you complete the replacement?		 - Go to Step 23  -
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  Go to Step 22 
19 Replace the RH door latch. Refer to LOCK ACTUATOR REPLACEMENT - FRONT DOOR .
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 door key switch connector and C200.
Did you complete the repair?		 - Go to Step 23  -
21 Repair the open in the ground circuit between the door key switch connector and G200.
Did you complete the repair?		 - Go to Step 23  -
22
  1. Replace the BCM. Refer to BODY CONTROL MODULE REPLACEMENT .
  2. Program the BCM with the proper calibrations. Refer to BODY CONTROL MODULE (BCM) PROGRAMMING/RPO CONFIGURATION .
  3. Perform the learn procedure.
Did you complete the replacement?		 - Go to Step 23  -
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) Description and Operation  .
Does the system work as described?		 - System OK Go to Diagnostic System Check - Theft Deterrent 
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