Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Door Key Switch Signal | 1 | 1 | 1 | -- |
Driver Door Key Switch Low Reference | -- | 1 | 1 | -- |
1. Content theft deterrent will not disarm using door key | ||||
Circuit/System Description
The content theft deterrent (CTD) system is a software based system in which the body control module (BCM) actively monitors certain inputs to determine if unauthorized vehicle access is being attempted. The driver door lock cylinder switch is used as an input to disarm the CTD system. The driver door module (DDM) monitors the driver door key switch signal circuit to determine if the driver door cylinder is being rotated, indicating a vehicle key is being used to unlock the vehicle and the CTD system should be disarmed. The door key cylinder switch, located in the door latch assembly, provides a switched ground for the signal circuit. The DDM communicates the status of the driver door key switch to the BCM via serial data.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Description and Operation
Content Theft Deterrent (CTD) Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Verification
Ignition ON, verify the scan tool Door Key Cyl. Unlock Switch parameter cycles between Idle and Unlock while turning the driver door lock cylinder with the vehicle key.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the door lock key cylinder switch.
- Ignition OFF, test for less than 10 ohms of resistance between the low reference circuit terminal B and ground.
- Ignition ON, verify the scan tool Door Key Cyl. Unlock Switch parameter is Idle.
- Install a 3A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Door Key Cyl. Unlock Switch parameter is Unlock.
- If all circuits test normal, test or replace the door lock key cylinder switch.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the DDM. |
| ⇒ | If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the DDM. |
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the door lock key cylinder switch.
- Test for infinite resistance between the signal terminal A and the low reference terminal B with the switch in the open position.
- Test for less than 2.0 ohms of resistance between the signal terminal A and the low reference terminal B with the switch in the closed position.
- Test for infinite resistance between each terminal and the door lock key cylinder switch housing/case.
| ⇒ | If not the specified value, replace the door lock key cylinder switch. |
| ⇒ | If greater than the specified range, replace the door lock key cylinder switch. |
| ⇒ | If not the specified value, replace the door lock key cylinder switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for DDM replacement, setup, and programming. |
