Thanks, I check that fuse and it is OK. I see there is a circuit breaker on the schematics. This car does have A/C does that mean the right side (A/C) of diagram is the one to use?
I replaced the relay - still no clicking in relay when I turn on switch ( no power at leads in back as well). Also, compressor clutch broke early in summer - I did not repair - can there be a tie in with this?
Onepower to circuit always hot - second point is always showing about 0.30 volts - regardless of switch position. thoughts?
Did you check this with the key on? If so, start the engine and see if that makes any difference.
If not, then we need ot find out which circuit does and does not have power going to the relay.
With car running - full voltage to two circuits. If your are sure there is no 30 amp circuit - I will check for line problems between fuse box and back of car. what color is the hot coming out of the box? I am assuming dark green = thicker gauge wire.
With that - thanks for the help, thought it would be a simple question. I will accept answer.
YES... the dark green wire is the wire that leave the relay (after the relay is activated) and powers up the grid.
THere is that 30 amp circuit breaker in the junction box that will trip and could allow for no power going to the grid. Just keep that in mind. Maybe it is bad or maybe it is just tripped??
Sorry for the delay!
It should be in the junction block on the instrument panel. It will be very close to the relay.
If you need a diagram or the locations, just let me know!
What side of the car are you on?
According to the picture, these two circuit breakers are "inside devices" Maybe it is inside or behind the dash on the opposite of the fuse/relay panel.
Here is another picture.
The Circuit Breaker for the Rear Defogger is on the Right side (passenger) of the Dash next to doorRemove Panel to expose
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Have read all & if your 2004 Impala does NOT have the Circuit Breaker on the "RIGHT SIDE" of the Dash as shown, then it is only activated thru the BCM & powered as shown above from the Right Hand RELAY
This is not rocket science
I did answer, but you refuse to understand
The Switch triggers the BCM
The BCM triggers the Relay (ground) to supply power to the Rear DefoggerIf the Circuit Breaker is not there, then the Voltage dependency is from the 60 amp fuse
If you are not competent enough to test the Relay, Ground & Voltage, please have someone that can, complete the jobUse of Dealer Tech 2 Scan Tool would probably narrow this down & cost you less than 1 hour labor
Sorry you feel that my answer is not good enoughI never said "I" was a rocket scientist, so please stop with the taunting
you have a nice evening
Sorry.,This is open to anyone that wishes to answerIf you do not want to test the circuit, then you will not find the problem