System Operation
System Diagram
Item | Description |
---|---|
1 | Power Liftgate |
2 | Hood Ajar Switch |
3 | Passive Key |
4 | Horn |
5 | GWM |
6 | GWM |
7 | PDM |
8 | DLC |
9 | IPC |
10 | RTM |
11 | BCM |
12 | Left Door Lock Control Switch |
13 | DDM |
14 | Right Door Lock Control Switch |
15 | Ignition Switch |
16 | Door Ajar Switches |
17 | RGTM |
18 | Turn Signal |
19 | Courtesy Lamps |
Network Message Chart
Module Network Input Messages - BCM
Broadcast Message | Originating Module | Message Purpose |
---|---|---|
Door lock switch status | DDM | Used by the BCM to arm the perimeter alarm. |
Door lock switch status | PDM | Used by the BCM to arm the perimeter alarm. |
RKE data | RTM | Used by the BCM to arm/disarm the perimeter alarm or to activate/deactivate the panic alarm. |
Module Network Input Messages - IPC
Broadcast Message | Originating Module | Message Purpose |
---|---|---|
Perimeter alarm chime request | BCM | Used by the IPC to sound the perimeter alarm chime during the 12 second delay. |
Perimeter Alarm
The BCM controls the operation of the perimeter alarm. It monitors inputs from the RKE system, the passive entry system, the power door lock system, the PATS and the ignition status to determine when to arm the perimeter alarm.
The BCM monitors all of the door ajar switches, the hood ajar switch, the CAN and the ignition status to determine when to activate the perimeter alarm. When the BCM detects an input indicating an unauthorized entry into the vehicle, the BCM activates the perimeter alarm by sounding the horn and flashing all the turn signals and interior courtesy lamps at regular intervals.
The BCM monitors the RKE system, the passive entry system, and the PATS to determine when to disarm the perimeter alarm.
Perimeter Alarm Arming
The perimeter alarm is ready to arm any time the ignition is off. The perimeter alarm pre-arms when any of the following actions are performed:
Once the system is pre-armed, there is a 20 second countdown before the perimeter alarm is armed. Each entry point to the vehicle (hood, door, liftgate) is armed separately and must be closed before that entry point begins the 20 second countdown to become armed. If all entry points are closed, the turn signals flash upon locking indicating that all entry points are entering the 20 second countdown.
Perimeter Alarm Activation
The perimeter alarm has a 12 second delay when the driver front door is opened without using a RKE transmitter, the keyless entry keypad, or a passive key to unlock the vehicle. During the delay, a chime sounds. If the perimeter alarm is not disarmed within the 12 second delay, the alarm activates.
The perimeter alarm activates when any of the following actions are performed:
The perimeter alarm only activates 10 times per arming cycle. After that, the alarm does not activate. To enable the perimeter alarm again, disarm and arm it again.
Perimeter Alarm Disarming
The perimeter alarm disarms when any of the following actions are performed:
CAN Protection Strategy
When the perimeter alarm is armed, the BCM monitors the CAN . If a diagnostic scan tool is connected to the DLC , and an attempt is made to establish a session with the BCM , it activates the perimeter alarm.
Every time the BCM detects an unauthorized access (alarm activates), all BCM programming, PID
monitoring and self-test sessions are blocked for 10 minutes. At the
end of the 10 minute time period, the horn chirps to indicate the 1
minute of opportunity to communicate with the BCM and program keys if none are available.
Refer
to: Passive Anti-Theft System (PATS) - System Operation and Component
Description (419-01C Passive Anti-Theft System (PATS) - Vehicles With:
Keyless Vehicle System, Description and Operation).
Component Description
BCM
The BCM controls the operation of the perimeter alarm. Based on input, the BCM arms, disarms, activates or deactivates the perimeter alarm.
The BCM requires PMI when replaced. Additionally, at least 2 keys must be programmed and the parameter reset procedure carried out.
Door Ajar Switch
The door ajar switch is a single pole switch monitored by the BCM .
The primary function of the door ajar switch is for the courtesy lamps
system.
Refer to: Interior Lighting - System Operation and Component Description (417-02 Interior Lighting, Description and Operation).
Door Latch
The door ajar switch and the lock/unlock solenoid are part of the door latch and are not serviceable separately.
The door ajar switch is monitored by the BCM and the primary function is for the courtesy lamps system.
Refer to: Interior Lighting - System Operation and Component Description (417-02 Interior Lighting, Description and Operation).
The lock/unlock solenoid is controlled by the BCM for locking and unlocking the door.
Refer
to: Handles, Locks, Latches and Entry Systems - Overview (501-14
Handles, Locks, Latches and Entry Systems, Description and Operation).
Hood Ajar Switch
The hood ajar switch is a single pole switch integrated into the hood latch that is normally closed when the hood is closed. When the hood is opened, the hood ajar switch opens to indicate an open hood.
The BCM sends a voltage signal to the hood ajar switch and based on the input, the BCM determines if the hood is open or closed.
Locating the Vehicle Identification Number
The vehicle identification number is on the left-hand side of the instrument panel.