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Thread: HELP - Where is SW-CAN on 2005 Pontiac GTO (E40 PCM).

  1. #1
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    HELP - Where is SW-CAN on 2005 Pontiac GTO (E40 PCM).

    Hi.

    I understand that in some cases, GM's stuff goes over regular CAN Hi & CAN Lo (pins 6 & 14 of OBDII plug).

    I read on a forum somewhere that my donor 2005 Pontiac GTO, which has the E40 PCM, is not exclusively CAN, and that the body related functions (windows, theft, hopefully also HVAC) are carried on SW-CAN, which also provides the link from the BCM (body control module) to the PCM (powertrain control module / ECU).

    Also, from what I see on the Internet, OBDII pin-1 is very often wired to SW-CAN, which is a 33.333kbps GMLAN protocol, that the ELM 327 will happily display.

    The problem I have is that I don't have the BCM module, and indeed I have done my own wiring, since I have transplanted this running gear into a Mazda RX7, so I have wired up the OBDII connector myself. The wiring diagrams I have only give CAN pinouts, and they do not list anything as going to Pin 1 of the OBDII connector.

    So, I'm a bit stuck. I'm almost certain there is this separate SW-CAN bus going on, at 33.33kbps. The main CAN bus, which I have already looked at with my ELM 327 device, is running at 500k.

    Any hints / ideas ?

    My ultimate aim is to be able to send the "AC Request" signal to the PCM. The PCM controls all the AC functions, but there is no way to tell it that you want the AC turned on, without the BCM..

    thanks,
    Carl

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    Hmm. It may be on Pin 9:

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    OK nevermind. It looks like it's not there at all on my drop-out, and I just need to concentrate on CAN.

  4. #4
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    Quote Originally Posted by carl0s View Post
    OK nevermind. It looks like it's not there at all on my drop-out, and I just need to concentrate on CAN.
    pin 14 is the low speed can... which is usually sw-can.
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    Quote Originally Posted by tripzero View Post
    pin 14 is the low speed can... which is usually sw-can.
    Thanks. How does that work then? I presumed pin 14 was just the other wire of the 'pair' that's used to carry the single stream of CAN data? SW-CAN means 'single wire CAN' doesn't it and I thought that was a totally separate thing to the typical pin 6/14 CANBus.

  6. #6
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    Found this:

    Quote Originally Posted by http://144mph.com/2009-OPCOM-OP-COM-OpelSaab-CAN-Diagnostic-OBD2-V139-P908234.aspx
    Since Opel uses many pin in the OBD connector, the diagnostic interface works as a multiplexer, and selects the appropriate pin for communication.

    PIN3, PIN7, PIN8, PIN12 = Serial Link (ISO9141, KW81, KW82, KWP2000)
    PIN6-PIN14 HSCAN - Dual-wire, High Speed CAN-BUS, 500 kbps
    PIN3-PIN11 MSCAN - Dual-wire, Medium Speed CAN-BUS, 95kbps
    PIN1 SWCAN - Single-wire, Low Speed CAN-BUS, 33.3 kbps

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