Schematic Reference: Theft Deterrent System Schematics

1

Did you perform the Theft Deterrent Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Theft Deterrent

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the door key cylinder unlock and liftgate key cylinder, if equipped, unlock parameters in the body control module (BCM) Inputs data list.

Does each of the key cylinder unlock switch parameters display INACTIVE?

Go to Step 3

Go to Step 4

1. With a scan tool, observe the door key cylinder unlock and liftgate key cylinder, if equippped, unlock parameters in the body control module (BCM) Inputs data list.
2. Insert and rotate a key in each door key cylinder to activate each of the door key cylinder unlock switches.
3. Insert and rotate a key in the liftgate key cylinder to activate the liftgate key cylinder unlock switch, if equipped.

Does each of the key cylinder unlock switch parameters display ACTIVE as the key is rotated?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 8

If equipped, does only the liftgate key cylinder unlock parameter display INACTIVE?

Go to Step 5

Go to Step 7

1. Turn OFF the ignition.
2. Disconnect the left front door lock assembly door key switch circuit connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the door key cylinder unlock parameter in the BCM inputs data list.

Does the scan tool display INACTIVE?

Go to Step 11

Go to Step 6

1. Turn OFF the ignition.
2. Disconnect the right front door lock assembly door key switch circuit connector.
3. Turn ON the ignition, with the engine OFF.
4. Observe the door key cylinder unlock parameter in the BCM inputs data list.

Does the scan tool display INACTIVE?

Go to Step 14

Go to Step 10

1. Turn OFF the ignition.
2. Disconnect the liftgate key cylinder switch if equipped.
3. Turn ON the ignition, with the engine OFF.
4. If equipped with liftgate key cylinder, observe the unlock parameter in the BCM inputs data list.

Does the scan tool display INACTIVE?

Go to Step 14

Go to Step 11

1. Turn OFF the ignition.
2. Connect a 3-ampere fused wire between the suspect key cylinder switch harness connector signal circuit to the suspect key cylinder switch harness connector ground circuit.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the suspect key cylinder unlock parameter in the BCM inputs data list.

Does the scan tool display ACTIVE?

Go to Step 14

Go to Step 9

1. Turn OFF the ignition.
2. Connect a 3-ampere fused wire between the suspect key cylinder switch harness connector signal circuit to a good ground.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the suspect key cylinder unlock parameter in the BCM inputs data list.

Does the scan tool display ACTIVE?

Go to Step 13

Go to Step 12

Test the suspected door key cylinder switch signal circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 15

Test the liftgate key cylinder switch signal circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 15

Test the suspect key cylinder switch signal circuit for a short to voltage or for an open circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 15

Test the suspect key cylinder switch ground circuit for a short to voltage or an open circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 15

Inspect for poor connections at the harness connector of the suspect door lock assembly or liftgate key cylinder switch, if equipped. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 16

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 17

Replace the suspect door lock assembly or liftgate lock cylinder, if equipped. Refer to Front Side Door Lock Replacement in Doors or to Endgate Lock Cylinder Replacement in Body Rear End.

Did you complete the replacement?

Go to Step 18

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Important: When replacing the BCM, perform the setup procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 18

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2