GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value

Yes

No

1

Check the unit.

Is the unit unplugged?

--

Go to Step 2

Go to Step 3

2

Plug the unit into the power source outlet.

Is the unit plugged in?

--

System OK

--

3

Check the wall outlet.

Is there power at the wall outlet?

--

Go to Step 4

System OK

4

Locate the problem with the outlet or change the outlets.

Is there power at the wall outlet?

--

System OK

--