you may also want to check the controller. it tells the relay how long to stay on. Your glow plugs don't stay on all the time. If your wait to start light doesn't stay on very long, then your controller is telling the relay to turn off. If the light isn't coming on at all then i would definetely check the controller. First check the 50amp fuse in the under hood block.
Check the fuses, check the relay and then check the fan motor.
It means that your relay is out, and has to be replaced with a new one, and once its been replaced, your check engine light will turn off in about 20 minutes or so.
If the fuel pump relay switch is bad then the fuel pump will not be turned on. Think of the relay like a light switch. If the switch has a bad connection then the light doesnt work.
A light is on or a relay is stuck pulling power from the battery.
Your flasher relay is shot and you need a new one.
i just replaced mine look around the passenger side head light area
ecu fault!
If you have power to the plug, and the relay is is replaced, did you check the GROUND?
did you ever find the answer?? i need to chek mine as my front fogs dont work on my 1997 independance 106
Have you checked the daytime running light module?
It is more than likely a dead cell in the battery. If this is the case the battery must be replaced. It can also be that a light on the vehicle somewhere is on pulling power from the battery. Can be under hood light, trunk light, glovebox light, courtesy light, or even the brake lights. Can also be that you have a relay that is stuck closed. This can be a Power Seat rely, power window relay, or any other relay vehicle.
in my 2001 A4, it was the hazard light switch that had to be replaced. maybe thaqt's your issue also