Canbus to GM Class 2

[Tre-Cool]

yeah. our early pre 2006 cars used single wire uart comms between abs,bcm,dash cluster so there was a pim module to translate between vpw and uart comms.

in 2006 a new pim was introduced to do CAN 2 uart comms, but the early can used different can id's to what the later ecu/tcm os calibrations used in the full blown CAN comms vehicles. luckily all the settings are still there and just need to be turned back on to transmit or listen.

[AngelMarc]

Cool.
Can the PIM send AC on/of based on state of one of it's inputs simply being high or low?

[Tre-Cool]

if you could reprogram it, I'm sure it would be possible as it does have inputs.

Pin Wire Colour Circuit No Function
1 Light Blue Power/Economy
2
3 Red/White Traction Control
4 Grey/Green Cruise Control On/Off
5 Green Tran Control
6
7
8 White/Black Cruise Control Resume\Accel Switch Signal
9 Blue Cruise Control Set\Coast Switch Signal
10 Red/Black Uart Serial Data
11 Purple Crank/Start
12 Blue Reverse Relay
13 Orange/Black Constant 12v
14 Pink Ignition Power
15 Black/Green Ground
16
17 Brown/Black To 6L80 Can High 1
18 Brown/Black To OBDI Plug Can High 2
19 Brown To 6L80 Can Low 1
20 Brown To OBDI Plug Can Low 2

[Madchuska]

I've finally had some spare time to put together a CAN <> J1850 VPW translation module for a VX Commodore running an aftermarket PCM with the factory PIM kept in place.

So far I have working:
-A/C request and status (bidirectional)
-coolant temp, and AC pressure forwarded to the PIM, which then broadcasts them via ALDL as part of the 41 63 cluster frame

I have also got some spare I/O so the module can double as a small CAN expander.

One thing I'm trying to understand is the J1850 VPW security frames functional addresses $92 & $93

I don't really have a standard vehicle to get logs from so would be great if anyone could share some knowledge on the above or even some J1850 VPW logs from a VT-VZ commodore.

[AngelMarc]

Cool. This an open source thing? link stuff