Access to some components is becoming a major issue for us. Its the one thing I don't enjoy about the job. But heyI have not yet accessed the ECM its way up behind the dash!
No Pain No Gain Being lazy & skipping essential tests will only lead to another set of problems.
Looking at a diagram, the EML & Glow Light are wired directly to ECM. And it is K line from DLC to Immo then to ECM.