Question about 2003 Mercury Grand Marquis

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The car radio/stereo has poor reception. I checked the rear connection to radio and the rear window defogger continuity. Is there a power module connected to the antenna wire somewhere?

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Posted on Jan 02, 2017

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SOURCE: clarion stereo in1997 mercury marquis wiring hook up to amplifer

make sure the speaker wires in the car do not have one side grounded.the output on the clarion is a floating output and cannot be grounded.the best solution is to look at the wiring on each of the speakers,and match them out to the ones on the clarion.the most common colr code is white front left,gray front right green rear left and purple rear right.each speaker has a plus and minus.mixing them up will result in the speakers being out of phase and result in poor bass performance.i would wire the wires directly to the clarion using crimp connectors.the first thing i would do is power up the stereo out of the car to 12 volts,and using a speaker make sure you have sound coming out.the yellow wire which is the clock/memory is a must to be connected to constant 12 volts or no sound can result

Posted on May 26, 2009

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juncro
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SOURCE: 2003 Mercury Grand Marquis radio reception problem

check the back of the radio, make sure than the antenna, connector is plug into the radio, if it is, then replace the radio.

Posted on Jul 30, 2009

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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.

Do you know what your messing with ? What's the problem ?

Oct 30, 2016 | Cars & Trucks

1 Answer

Poor radio reception and Setina push bar installation question


for the poor reception have you plugged in the antenna wire into the radio

May 18, 2013 | 2002 Ford Crown Victoria

2 Answers

2006 hyundai sonata radio reception is poor when rear defroster is on


Sounds like the dealer may be correct to me, but make them guarantee the job.

Oct 09, 2012 | 2006 Hyundai Sonata

1 Answer

I have a 2003 Honda Civic EX coupe. Installed aftermarket radio cd player and the cd works but the radio does not. The issue is not with the new unit as the previous player's radio would not work either....


If you're getting power to the CD player then there's power
to the radio. The antenna involves the grid on the rear window,
an antenna coil and cable to the radio. You can check the
grid for a break and if it's small you're auto parts store will
have a repair kit. My 05 Accord rear window defogger did
not work and it took Honda 2 attempts to repair it. Other
than checking the grid I would bring it to the dealer.

Feb 03, 2011 | 2003 Honda Civic

1 Answer

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

I have an '03 Olds Alero and the rear defrost is not working...replaced the relay....switch lights up and continuity is good across the grid. I put the relay in both ways..not knowing if it makes a...


The relay can go in either way--no problem. The relay runs off 2 different fuses--one to power the relay itself and one to power the defogger. Make sure both fuses 33 and 46 in the engine compartmet fuse box are good.
Next, have someone listen to the relay while you turn on the defogger to see if it's clicking. If it isn't clicking, the problem is before the relay--probably in the control panel.
If the relay is clicking, the problem may be with the antenna amplifier (radio borrows the defogger grid to improve reception). Not sure where that module is but would guess it's in the right pillar by the passenger's fuse box. If you can find it, check continuity across the 2 black leads. Also verify the back side of the defogger is getting it's ground.
Please let me know if you have more questions.

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Nov 02, 2010 | 2003 Oldsmobile Alero

1 Answer

1998 buick park ave. rear window defroster not working. fuse is good, has anyone replaced the black box located next to rear window where element plugs into along with the antenna. element on window is not...


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
outputs. If rear defogger is being requested on, go to next step. If rear defogger is not being requested on, go to
step 10).
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
harness connector terminal F3 (Brown wire). If test light illuminates, go to next step. If test light does not
illuminate, go to step 11).
3. Connect test light between ground and defogger relay harness connector terminal A2 (Red wire). If test light
illuminates, go to next step. If test light does not illuminate, go to step 12).
4. Connect test light between defogger relay harness connector terminals A2 (Red wire) and B3 (Purple wire). If test
light illuminates, go to step 13). If light does not illuminate, go to next step.
5. Disconnect rear defogger positive and negative feed bus connectors. Connect a jumper wire between defogger
relay harness connector terminals F3 (Brown wire) and A4 (White wire). Connect test light between ground and
positive feed bus connector terminal "A" (Black wire). If test light illuminates, go to next step. If test light does not
illuminate, go to step 8).
6. Connect test light between positive feed bus connector terminal "A" (Black wire) and negative feed bus connector
terminal "B" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 9).
7. Repair open in Black wire between rear defogger and ground. Recheck system operation.
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
operation.
12. Repair open in Red wire between rear junction block and underhood junction block (located in right front corner of
engine compartment, between battery and strut tower). Recheck system operation.
13. Connect test light between defogger relay harness connector terminals F3 (Brown wire) and A4 (White wire). If
test light illuminates, go to next step. If test light does not illuminate, go to step 16).
14. Reinstall defogger relay. Disconnect BCM 32-pin Pink connector C2. BCM is located behind right side of instrument
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.
16. Check for poor connection at defogger relay terminals. If connections are okay, replace defogger relay. Recheck
system operation.
17. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.

Feb 25, 2010 | 1998 Buick Park Avenue

6 Answers

Hyundai XG350 rear defogger doesn't work. I have changed the relays, checked all the fuses all good, dash switch works because I changed that too. checked the wire to the grid thats' ok too. now what?


The rear defogger is controlled by the Electronic Time and Alarm Control Module (ETACM). It receives a signal from the switch, and if the car is running, turns on the rear window defogger. Most frequently the problem is a blown 30A defogger fuse. Other common problems are the defogger switch itself or the switch not being plugged in properly, but there can also be a bad defogger relay, defective ETACM, or wiring issue. If you're capable of doing some electrical diagnosis, I'd encourage you to register for a free account at www.hmaservice.com (requires Internet Explorer and Adobe SVG Viewer) and print the schematic from the site. Also, does the indicator lamp come on when you depress the defogger button,I hope this help you in the right direction now you know how it works

Feb 12, 2010 | Hyundai XG350 Cars & Trucks

1 Answer

Stereo not working (no sound) as well as rear defogger


i was told if you put in an after market stereo, you need that GMOS-04 connection. It costs like $100.00. as far as defogger, idk. hope it helps

Sep 02, 2009 | 2001 Chevrolet Monte Carlo

2 Answers

2003 Mercury Grand Marquis radio reception problem


check the back of the radio, make sure than the antenna, connector is plug into the radio, if it is, then replace the radio.

Jul 30, 2009 | 2003 Mercury Grand Marquis

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