Using W61 on a VT V8.
SRS light stays on and sometimes there is a beep from the instrument cluster.
Has anyone experienced this before and if so what needs to be done to correct?
Is there a BCM/PCM Master Bus comms issue?
From VT Holden SIP.
The VT Series Model uses a BUS MASTER communication system, where the BCM is the bus master.The BCM periodically polls (surveys) each device on the bus and requests status data.
The devices connected to the bus are:
. Body Control Module (BCM)
. Powertrain Control Module (PCM)
. Electronic Climate Control (ECC)
. Instrument cluster (INS)
. Antilock Brake/Electronic Traction Control System (ABS/ETC)
. Supplemental Restraint System (SRS)
. External diagnostic tool (TECH 2)
The data provided by each device may be utilised by any device connected to the bus.
Each device has a unique response Message Identifier Word (MIW) for ease of identification.
The bus master (BCM) polls each control module with a serial data message which includes that control modules MIW. The polled control module responds by putting a serial data message onto the bus which includes its own MIW and data, which is retrieved and utilised by any control module requiring it. The BCM polls each device for a status update, once every 300 milliseconds. The exception to this being the PCM
which is polled twice every 300 milliseconds.




