Recent content by endjuser

That's a great idea to have a hardware simulator! I imagine you could use similar circuitry to interface the RP2040 with the VPW bus. Essentially the only thing the MC33390 is doing is overvoltage/short protection and wave shaping (rounding the edges) of the output from the microcontroller to...

I've seen a few folks on this forum experimenting with Arduino-based VPW adapters for interacting with Class 2 messages. I thought I would share one of my own projects, using a $5 Waveshare RP2040 Zero board to implement the VPW protocol using PIO for precise timing...

That was my previous setup, too :smile: The last time I had the dash apart to fix the cacophony of blend door actuators, I swapped out my VCIM for a DIY logger module in a cardboard box that saves everything to an SD card. The original plan was to tie into the microphone and audio out lines on...

I need to update my logger to send periodic "test device present" messages to keep the DPID report alive whilst I'm driving... hopefully will have time to do that this week. Regarding the other (88 25 29 07 XX) "wheels" message, I plotted it against vehicle speed (from PCM) and actual wheel...

@TJBaker57 It looks like I was a bit off on my interpretation of the Tech2 PID $1336 (Torque Request Signal) from Engine Data 2. It is 2 bytes, but instead of (a * 2.64) multiplier it's (a * .0264) in N-m. I still haven't quite worked out the rules for reading PID data from the Tech2 PCMCIA...

@TJBaker57 That's a great point... I will test logging this weekend with the Tech2 running and see how those DPID responses match up to the broadcast functional message. On my Tech2, the only Torque entry I see is in Powertrain → Data Display → Engine Data Display → Engine Data 2, which is...

Thank you. On my Suburban, a conversion of (a * 4) seems a bit high for a 5.3L. Using (a * 3) matches up to the curve I found here: https://www.automobile-catalog.com/curve/2004/1206260/chevrolet_suburban_lt_12-ton_4x4_5_3l_v-8.html#gsc.tab=0 I've noticed some other messages like that where...

I deleted and re-uploaded the attachment earlier after updating a bug in my csv export function. Please feel free to try again.

@NickInMN Attached is a sample log exported from my own VPW decoding project. It's supposed to be a .csv file, but had to rename it to .txt for uploading to the forum. I haven't figured out how to decode all of the messages yet, so take the "Value" details with a grain of salt for anything...

@TJBaker57 Thank you. I checked a few other logs from the Suburban and noticed the same 07 03 sequence that was missing from my scan yesterday. I've updated my previous post to include that, as well as the related BCM inputs, in case anyone else is looking to decode. Off-topic, do you happen...

Do you know what state your ignition key was in for this power mode? 28 FF 40 06 07 0F 0F DA I'm working on documenting all the Class 2 messages in my 2004 Suburban. On my truck, the power mode sequence looks like this: TIMESTAMP CLASS2 MESSAGE CHKSUM POWER MODE KEY POSITION INPUTS...

I've been doing a lot of research on the Class 2 messages in my 04 Suburban, including XM (DRR) and various radios. Here's an excerpt from the DRR section, specifically the exchange between radio and DRR when XM1 is selected on the radio: (AA A5 89 1C B2 XX is required before radio will...