Question about 2002 Chevrolet Impala

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Put on rear defogger radio goes out no signal ?

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My 2007 BMW 335i put the defoggers on in the rear and fm goes out

Posted on Aug 10, 2011

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Posted on Jan 02, 2017

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1998 pontiac sunfire


you have a bad ground .sorry cant tell you where to look to clean the connection .

May 21, 2014 | 1998 Pontiac Sunfire

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I have a 2002 alero. Need to know where to plug in the radio antenna.


THE OLDSMOBILE ALERO DONT HAVE A EXTERNAL ANTENNA MAST. THE OLDS ALERO HAVE WIRE GRID ANTENNA INCORPORATED INTO THE DEFOGGER GRID IN THE REAR WINDOW.THE GRID ANTENNA HAVE A REAR WINDOW ANTENNA MODULE MOUNTED BEHIND TOP OF THE REAR SEAT BACK. THE RADIO ANTENNA CABLE GOES TO ANTENNA MODULE LOCATED TOP OF THE REAR SEAT BACK.

Jan 02, 2011 | 1999 Oldsmobile Alero

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My 2004 6cfl. Trailblazer rear window defroster is not working. The wires appear to be making a good contact. The outside mirrors defrost ok using the same switch as the test window defroster. Is there...


There is a module that controls the rear window defogger grid . LGM/ EGM Liftgate or endgate module .Receive's message on class 2 serial data network from the HVAC control module to turn it on when button pressed . Fuse # 3 30 amp located in the rear fuse box . Do you know where the rear fuse box is ?
Rear Window Defogger Description and Operation
Rear Window Defogger System Components
The rear window defogger system consist of the following components:
• HVAC control module
• Liftgate module (LGM)/endgate module (EGM)
• Rear window defogger grid
Rear Window Defogger Operation (With LGM)
Battery positive voltage is supplied through the LGM 2 fuse to the LGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the LGM to enable the rear window defogger. The LGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.
Rear Window Defogger Operation (With EGM)
Battery positive voltage is supplied through the EGM 2 fuse to the EGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the EGM to enable the rear window defogger. The EGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
The following conditions must be met for rear window defogger to operate:
• The end gate glass position is not below the index position.
• The window express down movement is not requested.
• The window down movement is not requested.
If the end-gate glass is not fully closed, the DIC displays "Tailgate Glass Down" when the rear defogger operation is attempted.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.

Fuse Block - Rear
Beneath the left rear seat

Jul 13, 2017 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

Rear-window defogger wont work and radio cuts off when u put on


Sounds like a dead short. Disconnect the power to the radio and try the rear defog. Then to determine if it is the radio or the hater, disconnect the heater and put power to the radio. Another simple test is to, at night have the head lights on, turn the radio on see how much the lights dim. Then with the radio off, turn the rear defog on. Then try both. IF either one makes the head lights dim and not recover after a minute or so that devise is the shorted component. Check grounds on the radio and the heater.

Nov 30, 2009 | 2003 Pontiac Grand Prix

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Rear defrost on olds alero


Remove the interior panel next to the rear window on the passenger side. There should be a small black box (3"x3") bolted there. This box sends power to the rear defogger and carries the signals from teh integrated FM antenna. Often, the end of the plug fries and stops the defoggers from working while the radio has no problems.

The plug into the box is usually melted. It may look like it can be soldered and hardwired to work again, but more often than not the box is fried too. You can get them on the cheap from a JY or get them through GM.

Jul 13, 2009 | 1999 Oldsmobile Alero

1 Answer

TURN ON THE REAR DEFROST AND THE RADIO GOES TO STATIC. 2006 HONDA ACCORD EX-L


The radio antenna is shared by the rear defroster, there is a part called the "Antenna Amplifier-Rear Window Defogger Coil", it is behind the left side rear pillar trim. It prevents the static from happening.

Apr 09, 2009 | 2006 Honda Accord

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REAR DEFOGGER NOT WORKING 2000 OLS ALERO


There's a junction box behind passenger rear door that has 2 wires that are joined from the front and control the rear defroster and radio antenna.

Mar 09, 2009 | 2003 Oldsmobile Alero

2 Answers

Radio cuts out when rear window defogger is turned on(05' Altima)


I have the same problem in my 2003 Altima. I had a friend who works on cars check it out. I watched him and when he removed the panel under the steering wheel next to the driver's door you could hear a clicking noise. He said is sounds like my defogger relay/switch is bad. I located the part and it is not that expensive. I am going to purchase the part and have it put on. I will keep you posted to let you know if it solves my problem. If it does I will give you the name of the part so you can hopefully solve your issue.

Nov 13, 2008 | 2005 Nissan Altima

1 Answer

Rear defogger


The switch is part of a timer module that controls the rear defogger grid on the glass, they fail and create the problem you described, replace the module.

Oct 01, 2008 | 2001 Saturn L-Series

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