• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Driver Door Key Switch Signal | 1 | 1 | 1 | -- |
Ground | -- | 1 | 1 | -- |
1. Content Theft Deterrent Will Not Disarm Using Door Key |
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 key 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 driver door key cylinder switch, located in the driver door latch assembly, provides a switched ground for the signal circuit. The DDM communicates the status of the driver door key cylinder switch to the BCM via serial data.
Door Lock/Indicator Schematics
Content Theft Deterrent (CTD) Description and Operation
Control Module References for scan tool information
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.
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. |
⇒ | If not the specified value, test the signal circuit terminal 9 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. |
⇒ | If not the specified value, replace the door latch assembly. |
⇒ | If greater than the specified range, replace the door latch assembly. |
⇒ | If not the specified value, replace the door latch assembly. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for DDM replacement, setup, and programming |