2004 chevy impala: relay diagram passenger side fuse block

A 2004 Chevrolet Impala is experiencing issues with the rear defogger. The owner is unable to locate the fuse for the rear defogger, although the relay has been found. Both the manual and the vehicle's diagram indicate a 30-amp fuse, but it is missing. The owner has checked the fuse and confirmed it is functioning. The schematic shows a circuit breaker, and since the vehicle is equipped with air conditioning, it is suggested that the right side (A/C) diagram may be relevant. The relay has been replaced, but there is no clicking sound when the switch is activated, and no power is detected at the leads in the rear. Additionally, the compressor clutch failed earlier in the summer and has not been repaired, which may be related to the current issue. It is recommended to check for two power inputs to the defogger relay with the key turned on and the defrost switch engaged to ensure the Body Control Module (BCM) is sending a signal and that the circuit is intact. When the vehicle is running, full voltage should be present to both circuits. If the 30-amp circuit is confirmed to be absent, it is advised to investigate potential wiring issues between the fuse box and the rear of the vehicle. The hot wire color from the fuse box is assumed to be dark green, indicating a thicker gauge wire. The 30-amp circuit breaker located in the junction box could be tripped or faulty, which may prevent power from reaching the grid. The owner inquires about the location of this breaker, suspecting it may be on the passenger side and whether it is accessible by removing the glove box. The owner has consulted the owner's manual, which shows the 30-amp defogger breaker and the power seat breaker as "Inside Components." Upon inspecting the junction box, all breakers are visible except for these two. The right side of the junction box has a gray cover, which has been removed, revealing a white grid of wires. A screw in the middle of the grid has been unscrewed, but the grid remains attached, and the owner is hesitant to force it out. The owner wonders if "Inside Components" indicates the circuit is beneath the white grid, or if the breaker is located on the backside of the block, requiring glove box removal for access.

The 2004 Chevrolet Impala's electrical system includes various components that may affect the operation of the rear defogger. The rear defogger circuit typically includes a relay, fuse, and circuit breaker, all of which play crucial roles in ensuring proper functionality. The relay serves as an electronic switch that activates the defogger when the driver engages the defrost switch, while the fuse protects the circuit from overloads. The circuit breaker, located within the junction box, is designed to reset itself after tripping, providing additional protection.

To troubleshoot the rear defogger issue, it is essential to verify that the BCM is sending the appropriate signals. This can be done by checking for voltage at the relay's input terminals while the ignition is on and the defrost function is activated. If no voltage is detected, further investigation into the BCM or associated wiring may be necessary.

The absence of the 30-amp fuse raises the possibility of a wiring fault or a malfunctioning circuit breaker. The dark green wire, presumed to be the power feed, should be traced from the junction box to ensure continuity and that no breaks or shorts exist. If the circuit breaker is suspected to be faulty, it should be inspected for damage or tripping.

Accessing the circuit breaker may require removing the glove box or other components to reach the junction box's backside. Care should be taken during this process to avoid damaging any surrounding parts. If the circuit breaker is confirmed to be operational, further examination of the wiring harness and connections leading to the rear defogger may be warranted to identify any potential issues.2004 chev impala - unable to find the fuse for the rear defogger. I find the relay but both manual and actaul car diagram and passenger side fuse block show 30amp fuse - but nothing is there. 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 dia gram 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 YES.

it is possible. You are going to want to check for 2 powers going into the defogger relay with the key on and switch defrost pressed. THis will ensure that the BCM is sending a signal to the relay and that the complete other side of the circuit is ok.

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. 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 That is actually my original question - how do I find that breaker I t should be on passenger side - is it in back of the box take out the glove box or does the box come out The first diagram is the one I have in owner`s manual / on the junction box. It lists the 30 amp defooger breaker and the power seat breaker as "Inside Components". when I look at the junction box i see all of the breakers but these two "inside components". The right side of the junction box has a gray cover. i removed that. there is a whites grid with all the incoming or outgoing wires coming out. there is a screw in the middle of the white grid. i have unscrewed the screw - it does not come out all the way and the white grid is still attached. I did not want to place to much force to pull out the white grid. does the "inside component mean the circuit is under the white grid The diagram shows it comes off - is that a correct assumption Or is the breaker on the backside of the block which requires taking out the glove box ( still not sure i could get to it.

Are you able to see the previous stream of messages on this one It is not there - or at least not where I can find it - let me know if you can`t see the previous mechanics resposnes and questions. 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 Ask-a-doc Web sites: If you`ve got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers.

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