2004 Chevy Impala Drivers door keyless entry

Tiny
BLGJUNK
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
The drivers door does not lock or unlock using the fob or the button on the door. All other doors work perfectly. I checked the wires going into the solenoid and when the button is pushed power appears. I bought a new solenoid and it does not work either. I checked the old on by connecting it directly to the Battery and it functioned every time. But it does not work when connected to the wiring in the door. I don't know if it is a ground problem or not enough amps or voltage drop or what. Suggestions of places to look?
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Monday, July 21st, 2008 AT 5:05 PM

4 Replies

Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Did you check at the solenoid for voltage and ground
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Tuesday, July 22nd, 2008 AT 8:33 AM
Tiny
BLGJUNK
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  • 1 POST
Yes, I checked at the solenoid. I unplugged the electrical wire harness from it and checked the prongs for voltage. At first I was grounding to a bolt and then I used both prongs in the plug and hit the button and I had a voltage drop come across. However, it only dropped to 5-6 volts. I don't know if that is enough of a drop to activate the solenoid. When I hooked th solenoid directly to the battery it worked perfectly. But in the door it does not move or make a sound. Neither did the new one.
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Tuesday, July 22nd, 2008 AT 4:37 PM
Tiny
RHALL77
  • MECHANIC
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http://www.2carpros.com/forum/automotive_pictures/166241_789087_1.jpg

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Wednesday, July 23rd, 2008 AT 7:11 AM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Here is a wiring diagram. Sounds like there is a high resistance in the circuit or a bad BCM (body control module). This should help you out
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Wednesday, July 23rd, 2008 AT 7:12 AM

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