testing obc

[maneeno325e]

hey i was wondering how you guys are testing the pins for the obc, i have a DMM but would rather not back-probe the wires. do you guys have a trick for fitting the lead into the pin holes or what?

Also i have a confirmed good obc and from my sources i should have power at pin 6 and ground at 10 correct? trying to troubleshoot my screen having no display, i can see the backlight on so i know thats good. thanks guys.

[Gregs///M]

The bulbs are probably out, very common on e30. You can find the pinout on the electrical troubleshooting manual which can be found on this site. Keep searching.

[maneeno325e]

The bulbs are probably out, very common on e30. You can find the pinout on the electrical troubleshooting manual which can be found on this site. Keep searching.

thanks but i can see the bulbs light up, or atleast i think so. i was just trying to see how you guys probe the connector terminals/pins with a dmm.

[UNHCLL]

Did you just install a new headunit?

[maneeno325e]

Did you just install a new headunit?

no however mine is removed. does this make a difference?

[UNHCLL]

There is a connection behind the radio where it feeds power to the OBC to actual make the crystals light up and display letters/numbers. If this is not connected, you'll just get a warm glow from the screen, but no actual display.

If this isn't a problem that just came up, and has been present since you either bought the car or removed the radio, I'd start there.

[Gregs///M]

I believe the SI board in the gauge cluster directly powers the OBC. The backlight for the OBC can still be lite but very dim. When my bulbs burnt out, I can still see the lettering in the day time but at night, it was no display. Changed the bulbs and its all good now.


I do not recall any wiring from the radio harness powering the OBC.