Heated Mirrors

When the rear defogger is turned ON, the Instrument Cluster (IPC) confirms that the engine is running. The IPC receives engine status from the powertrain control module (PCM) via the class 2 serial data line. When engine status has been confirmed, the IPC turns ON the defogger-ON LED and commands the body control module (PZM) to turn ON the defoggers via the class 2 serial data line. When the PZM receives the command, the defogger relay coil grounds through PZM terminal D9. The IPC also controls the timing cycle function. When the 5 or 10 minute cycle has elapsed, the IPC switches OFF the defogger-ON LED and commands the PZM to turn OFF defoggers, via the class 2 data line. When the PZM receives the command, ground is removed through terminal D9. When the PZM grounds the defogger relay coil, the relay energizes causing the relay contacts to close. Battery voltage from the BODY 2 Fuse is applied to the HTD MIR Fuse. The HTD MIR Fuse provides battery voltage for the outside mirror defoggers.