Looking for any info about the Ford SCP / J1850 PWM / MS-CanBus info.
Seem from what I have read here and other places, I would need to ensure the canbus adapter purchased is compatible with the Medium Speed (MS) Canbus system for dash light indicators. This has been more difficult than originally anticipated and not sure which adapter to purchase that are compatible with RealDash.
I am happy to put in the leg work of sniffing said canbus for blinkers, hazards and highbeam indicators versus in-dash LED lights and get the needed info to create an XML file but it seems like this should be done with an ELM327 device, which I already have, but do not know what my next step should be.
I apologize for my ignorance but if there is any info or steps/guides I can follow, I would greatly appreciate it!
Vehicle info: 2006 Ford Crown Victoria P71 (retired police)
Per service data and wiring diagram, all body modules run on SCP/MS/J1850 PWM canbus where engine diag/monitor runs on highspeed canbus.
SCP speeds are 41.6kbps or 10.4kbps and 2 wire (pin 2 + and 10 - in OBD port)
I found the following document but I am not smart enough to fully understand what is being discussed:
https://www.cds.caltech.edu/~murray/dgc05/upload/c/c0/Part1_v2003.0.pdf
I have located an OBDII adapter that seems to have some instructions for use, not sure if this would help get me moving in the right direction or if my ELM327 cable would do.
https://5ghub.us/product/obd/
https://5ghub.us/wp-content/uploads/2020/10/OBD-UART.pdf
None of this is reliable… I freaked out and developed VPW <> CAN converter - there are quite different programs for analyzing CAN
I don’t know if this will help you, I have a 1997 Ford Ka, I use an ELM 327 version 1.5 with the JW1850 protocol. For speed and RPM I use an Arduino to measure frequency, and also for the car lights, I don’t know of a JW1850 protocol that sends light information.
what would you recommend for me? I’ve read a lot if not all of your past posts and it seems like you know quite a bit about this protocol.
I can get all the engine data from the obd2 port. reading on fords SCP/MS-can/J1850, it seems that all the body modules communicate there. So the info i need is from the LCM (light control module) for the said indicators and based on the research ive looked at can be extracted from that network. I just do not have the knowledge on how to do that.
Last night i read up on the AT commands that can be sent with a terminal like Tera Term to monitor that network and then watching for the code changes when something like the indicator is on?