Circuit/System Description

Modules connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter module.

DTC U1885 will set in the hybrid powertrain control module (HPCM) when the drive motor generator battery control module (BECM) looses communication with the serial data gateway module (SDGM) on the HSGMLAN serial data bus. The BECM communicates only on the PTLAN serial data bus while the HPCM communicates on the PTLAN and the HSGMLAN serial data bus.