Contents Wiring diagrams Section: Door Locks & Anti-Theft Systems All sections

Theft Deterrent System: Overview Chevrolet Silverado 2500 HD

Door Locks & Anti-Theft Systems 5 illustrations ~538 words

Scheme 55

Scheme 55: Theft Deterrent System Schematics

Scheme 56

Scheme 56

Scheme 57

Scheme 57: Inclination Sensor (SPO Alarm)
Connector Part Information OEM: 15324429 Service:15306167 Description: 4-Way F 1.2 Timer Series (BK) Terminal Part Information Terminal/Tray: See Terminal Repair Kit Core/Insulation Crimp: See Terminal Repair Kit Release Tool/Test Probe: See Terminal Repair Kit

Inclination Sensor (SPO Alarm) Connector Parts Information

PinWire ColorCircuit No.Function
10.5 RD/WH4540Battery Positive Voltage
2Not Used
30.5 YE5058Intrusion Sensor Armed Signal
40.5 PU5059Intrusion Sensor Alarm On Signal

Inclination Sensor (SPO Alarm) Connector Terminal Identification

Scheme 58

Scheme 58: Security Indicator Lamp (SPO Alarm)
Connector Part Information OEM: 12047662 Service:12085535 Description: 2-Way F Metri-Pack 150 Series (BK) Terminal Part Information Terminal/Tray: See Terminal Repair Kit Core/Insulation Crimp: See Terminal Repair Kit Release Tool/Test Probe: See Terminal Repair Kit

Security Indicator Lamp (SPO Alarm) Connector Parts Information

PinWire ColorCircuit No.Function
A0.5 RD/WH4540Battery Positive Voltage
B0.5 GY728Security indicator Control

Security Indicator Lamp (SPO Alarm) Connector Terminal Identification

Scheme 59

Scheme 59: Shock Sensor (SPO Alarm)
Connector Part Information OEM: 12064760 Service:12058208 Description: 4-Way F Metri-Pack 150 Series (BK) Terminal Part Information Terminal/Tray: See Terminal Repair Kit Core/Insulation Crimp: See Terminal Repair Kit Release Tool/Test Probe: See Terminal Repair Kit

Shock Sensor (SPO Alarm) Connector Parts Information

PinWire ColorCircuit No.Function
A0.5 RD/WH4540Battery Positive Voltage
B0.5 YE5058Intrusion Sensor Armed Signal
C0.5 PU5059Intrusion Sensor Alarm On Signal
DNot Used

Shock Sensor (SPO Alarm) Connector Terminal Identification

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.

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. Based on inputs such as the door ajar switches, the liftgate ajar switch, and the hood ajar switch, the BCM determines whether a CTD alarm is warranted. If unauthorized access is being detected, the BCM will pulse the vehicle horn and flash the turn signals as a means of theft deterrent.

The security indicator acts as a status indicator for the content theft deterrent (CTD) system when the ignition if OFF and a fault indicator for the immobilizer system with the ignition ON. When either the body control module (BCM) or theft deterrent module (TDM) requires the security indicator to be illuminated, a serial data message is sent to the instrument panel cluster (IPC), which will illuminate the indicator.

The Shock Sensor is a component of the Content Theft Deterrent system which monitors the vehicle for shock impacts. The shock sensor provides an alarm signal to the body control module (BCM) in the attempt that the vehicle is being tampered with. The sensor ground is controlled through a switched ground output from the BCM. By providing ground from the BCM the sensor is powered-up and activated.

Content Theft Deterrent (CTD) Description and Operation

The content theft deterrent (CTD) system, when armed, is designed to deter vehicle content theft by pulsing the horns and exterior lamps for approximately 30 seconds when an unauthorized vehicle entry is detected. However, the CTD System does not affect engine starting.

An unauthorized entry can be any of the following with the CTD System armed

  1. When the liftgate or liftglass has been opened without the use of the keyless entry system or without first being unlocked.
  2. When any door is opened without first being unlocked using the keyless entry transmitter.
  3. When the driver door is opened without being first unlocked using the driver door cylinder.

The components of the system are

  1. The body control module
  2. The door ajar switches
  3. The driver door key cylinder switch
  4. The liftgate/liftglass ajar switch