Question about 2005 Nissan Altima

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

05' Altima 2.5 S--Radio cuts out when rear window defogger is turned on- and the rear window never defogs. Are they on the same circuit? No fuse is blown.

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  • leinzv Nov 14, 2008

    I have the same problem. My radio goes to static sound when my rear window defogger is turned on. (2005 Altima)

  • Anonymous Mar 23, 2009

    '03 Altima - Radio cuts out when rear window defogger is turned on

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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.

Posted on Mar 23, 2009

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This could be caused by a couple of things. The rear window defogger has a ground seperate from the antenna ground. It is on the passenger/right side C pillar. Near that ground there is an antenna amplifier that is bolted to the C pillar. The amplifier grounds through its mounting bolt. Check the bolt for tightness corrosion. Finally, there is a condensor on the rear defogger that is supposed to suppress any static, if this is bad it could cause the static. Do you have aftermarket tint on the rear glass? If so, the installer could have damaged the wire in the glass during installation.

Posted on Nov 26, 2008

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Wiring diagram for rear window defogger 2005 silverado from dash to deffoger


Rear Window Defogger System Components
The rear window defogger system consist of the following components:
• HVAC control module
• Body control module (BCM)
• DEFOG relay
• Rear window defogger grid
Rear Window Defogger Operation
When you turn the ignition to the ON position, ignition voltage is supplied to the DEFOG relay coil. Battery positive voltage is supplied at all times to the DEFOG relay switched input. 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 BCM. The BCM energizes the DEFOG relay by grounding the control circuit of the relay. This allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger. Ground for the rear window defogger is provided by G306 or G390 (crew cab).
When you turn ON the ignition and press the rear window defogger switch for the first time, the defogger cycle lasts 10 minutes. Further operation results in 5 minute defogger cycles.

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My rear defroster won't work I have a 2000 Buick Park Avenue


Could be a bad relay !
The rear defogger circuit is protected by a 40A fuse. Voltage is supplied through the fuse to the rear defogger relay. When you press the rear defogger switch, the heater and A/C programmer sends a class 2 message to the body control module (BCM), to ground the rear defogger relay coil output circuit. This in turn closes the relay contacts allowing current to the rear window grid.
Do you know what a class 2 message is ? What a BCM is ?
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Do
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my guess, wild is, the rear electric defogger, is dead.
the test is so easy.
attach any voltmeter to the 2 grid terminal. and turn the defroster on.
12v there? yes, then the grid is open.
no> the relay that feeds it is bad. (or its controls or FUSE is blown)
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If you're getting power to the CD player then there's power
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Rear Defogger Inoperative, But Heated Mirrors Operate Correctly
1. Connect scan tool. Turn ignition switch to RUN position. Turn rear defogger on. Using scan tool, display BCM
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2. Ensure ignition switch is in RUN position. Remove rear defogger relay from rear junction block, located on center
right rear of passenger compartment, under rear seat. Connect test light between ground and defogger relay
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3. Connect test light between ground and defogger relay harness connector terminal A2 (Red wire). If test light
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4. Connect test light between defogger relay harness connector terminals A2 (Red wire) and B3 (Purple wire). If test
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5. Disconnect rear defogger positive and negative feed bus connectors. Connect a jumper wire between defogger
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6. Connect test light between positive feed bus connector terminal "A" (Black wire) and negative feed bus connector
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8. Repair open in Purple wire between rear junction block and heated backlight antenna module. Recheck system
operation.
9. Check for proper terminal contact at rear defogger connectors. Repair as necessary. Recheck system operation.
10. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.
11. Repair open in Brown wire between rear junction block and instrument panel junction block. Recheck system
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12. Repair open in Red wire between rear junction block and underhood junction block (located in right front corner of
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13. Connect test light between defogger relay harness connector terminals F3 (Brown wire) and A4 (White wire). If
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panel, near rear of glove box. Using DVOM, check voltage between ground and BCM harness connector C2
terminal A3 (White wire). If any voltage is present, go to next step. If no voltage is present, go to step 17).
15. Repair open or short to ground in White wire between rear junction block and BCM. Recheck system operation.
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17. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.

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