2004 Mercury Grand Marquis - Answered Questions & Fixed issues

Probably a broken wire in the loom. Check for continuity with your test meter and oscilloscope.

Looking for mine also Locked my keys in my car and never had the keypad code

They are availabe at www.rockauto.com if the picture below is the part in question.

Disconnect the battery cables for 3minutes only if you have a key fob remote to shut off the alarm if you have one otherwise you be stuck in theft mode and a no start condition will be active are you trying to clear codes if so go to Auto zone first get the codes read and then ask them to clear it but if your doing it for inspection it won't work because system monitors need to be set and they will not if there's a problem and your check engine light will come on again or you'll fail the inspection from a monitor that's not cleared yet even if the check engine light is off

Go to autozone.com enter your car info under manuals and you can look it up for FREE. Mike

the problem can be that the gear wheel can be strip on one spot ,and if the gear is plastic,and because of the back being more heavy it puts more strain on the gear and some times one can rush and push the back by hand ,all this can cause the gear to strip.

check for fuses. If some other defective stuff that you replaced broke the fuse then you may need to repower the system by replacing the fuse or a relay. As for the air, do you mean no blower for both heat function and A/C function? An Owners Manual would show location for fuse and relay for blower. A web-search with term like "2004 Mercury Grand Marquis fuse panel or blower relay location" could help. Last, do not know if blower resistor relay was known good quality. This part is tempermental. Sometimes takes tap from broom or snowbrush handle to wake it up. Sad part is that after warranty there is little benefit from a used to new part. Should have been a National recall on this part.

Does it have a vaccuum modulator for transmission?

as long as there is power to stereo i usually try this first see if it has a factory reset button any where usually a pin sized hole if not disconect the battery and re conect the battery usually spits the cd out and resets it

put car in reverse, while rolling set parking break, this will adjust the shoes out, to hold it. Be sure not to set it too many times it will lock wheels down.

I would replace the clock spring rotating contact drum under the steering wheel for the restraint system warning light issues and check the operation of the headlight sensor when the lights will not go off, this is likely a sticking relay.

Nothing like guessing! There can only be 2 sources of issues. Lack of fuel, lack of air flow. Check fuel pressure and flow, check EGR and IAC.

check out this link https://www.youtube.com/watch?v=keCaYdmG0m4

Ford shop has to do this. Make sure you tell them what you did. don-ohio (:^)

According to my info, you don't have one. You do have a maf sensor and that should be in air intake.

light control module
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Remove the steering column cowling and spray lubricant into whatever places can be reached. A gentle tapping on the lock body while rocking the steering wheel side-to-side and attempting to work the key might eventually free it and allow it to work, although even if it does the lock and key should be replaced to ensure reliability. If it does not free the lock will have to be removed by the prescribed method and a new one fitted.

You will have to take to the dealer an have the PATS system reset , need factory scan tool to do it . PATS - passive anti-theft system .

ok i am going to assume by "holding the turn sinal back" that means the high beams are on. Now i believe that the grand marquis has 1 lo beam and 1 hi beam relay if they are rated at the same amperage you can swap em . The mercury i have has two locations under the hood and under the steering column to the left. In the car it is has a locking tab that you have to pull down to unlock it and it will swing out. In all honesty if you have 20 bucks and want to invest it i would suggest buying an repair guide either way good luck.