sean-k94z

Hi, I'm tying to use my in-dash SES light for something els. Does anyone know what wire from the PCM triggers the SES light. I have looked at a few schematics but I cant find anything labeled service lamp. All I could find was skip shift lamp. Any ideas?

Thanks,
Sean

shock6906

Curious...what are you going to be using it for?

sean-k94z

I have an after market knock detection system I want to use. I want the engine light to flash when knock is detected.

Projectz28

You may have to wire a relay into it to drive the light. The SES has a constant pos to it and the PCM grounds the circuit to turn on the light. I forget which wire it is but I can go look in my service manual later tonight or tomorrow for ya...

shoebox

Did you look for "MIL control"? That is what it is called. On a 1994 PCM, it would be D9 (that's the blue connector).

sean-k94z

awesome, ill give that a try. Looks like grounding D9 will trigger the light.