Platform Zone Module: Notes

NOTE: Platform Zone Module (PZM) is also referred to as Body Control Module (BCM).

Signals that activate the PZM are known as "wake-up" signals. PZM is asleep when it is not controlling or monitoring the following wake-up functions: Key in door lock switch, door ajar switches, power door lock switches, trunk ajar switch, trunk tamper switch, ignition on, ignition accessory (ACC), and any class 2 communication requiring PZM interaction.

PZM uses class 2 serial data line to communicate with other system control modules. Class 2 serial data is transmitted on a single wire at an average of 10.4 Kbps (10,400 bits per second). Class 2 uses a variable pulse width modulation to carry data, and speed is determined by message being transmitted. The bus is active at 7 volts nominal and inactive at ground potential. Class 2 serial data line is tolerant to different levels of ground potential.