2 weeks ago I installed the SP meth controller with the Alta boost gauge instructions, to the 12V switched on the column. Yesterday while driving my tach and speedometer both died, as well as the power to my HVAC and headlights.

• Nothing works on the tach except the turn signal light. I can still use cruise control but the light doesnt function.
  
• The speedometer shows my airbag warning light, but doesnt show that my speed sensors arent working. It shows milage, but its not counting anymore.
  
• Headlights/foglights dont work except I can activate the high beams by holding the stalk.
  
• I recently replaced the front 2 speed sensors, and the warning light went away for 3 days.
  
• I checked every connection on the meth injection and have found no faults. I then disconnected power to the system.
  
• I have checked every relevant fuse in the cab, and in the engine bay.
  
• I have removed and cleaned the ignition switch.
  
• When starting the car the tack will climb to 2,000 then drop back to 0. The speedometer doesnt not move from 0. None of the lights other than the airbag warning function at any time.
  
• AFAIK everything else is functional.

2002 R53, 105K miles manual trans.

 

Im no expert by any means but I'm wondering if it's the body control module that's done that, my tach dash lights hvac and fog lights quit working and it was a mixture of the body control
Module and the speedo that went out.

 

Im going to take a look at it sometime today or tomorrow. But my sunroof is perfectly leak free. I get a very small amount of water through the 3rd brake light during extremely hard rain, but my car is garage parked so thats a very rare occurance. The passenger floor has never been wet while during my ownership of the last 2 years.

 

Its not the tach, and the BCM is dry as a bone.

 

Well the tach works off the speedo but I wonder if that gauge is causing interference or if it back fed and burnt something out

 

I had the windows up at the time and had no foul smells. Ill need to dig into the speedo though.

 

So Im getting code p1612, apparently thats CAN bus issues. Where is that sucker so I can check it out.

 

Popped the ABS connector off. All the pins are shiny and clean.

 

Now it will not start at all.

 

The can system is what runs the speedo tach and ect, where did you
Tap into for that gauge you installed

 

I tapped into where Alta suggests for their boost gauge. Disconnecting the system was the first thing I did. All connections were clean. Its not the meth kit causing the issue.