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2002 Chevrolet Monte Carlo door locks

Tiny
LBEACH001
  • MEMBER
  • 2002 CHEVROLET MONTE CARLO
  • 3.4L
  • V6
  • FWD
  • AUTOMATIC
  • 145,000 MILES
Doors will not lock or unlock with the door switches but will with the key fob and when you put the car in gear and unlock when you put it in park. All fuses are good. Any ideas
Friday, October 16th, 2015 AT 3:46 PM

8 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Locate the main ground near the body control module under the left side of the dash. There's a black wire with a white stripe. Make sure it's got a good connection to ground and that the wire isn't broken at the connector. Pop the driver door switch out and check continuity between the black with white stripe wire there. Then do the same with the passenger door. Make sure both sides also have battery power. The other possibility is both door switches have failed at the same time.
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Saturday, October 17th, 2015 AT 7:22 AM
Tiny
LBEACH001
  • MEMBER
  • 5 POSTS
I checked the black with white strip continuity is good. I have good ground on the black/white wire and the solid black at the switch. Gray Wire at switch has power when I turn headlights on, orange wire at switch has nothing on ether switch.
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Sunday, October 18th, 2015 AT 9:28 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
The grey wires are for the interior lighting circuit.

Locate the body control module up by the parking brake pedal. Find pin B3, the orange and black wire. It should have power at all times. If it does, follow it to until you find the break. Check the fuse panels, Make sure all the fuses are good. My reference is showing both a left and a right instrument panel fuse box.
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Monday, October 19th, 2015 AT 9:41 AM
Tiny
LBEACH001
  • MEMBER
  • 5 POSTS
Continuity is good between the switch and bcm on the orange wire. No power at orange wire at bcm and fuses are all good.
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Monday, October 19th, 2015 AT 11:41 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
From what I'm seeing, the BCM should supply constant power on the orange wire. Check pins A1, A3, and A4 on the BCM, all are orange wires. They should have battery power all the time.
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Monday, October 19th, 2015 AT 2:04 PM
Tiny
LBEACH001
  • MEMBER
  • 5 POSTS
Could you send me the wire schematics to the door lock system. I have three orange with power and two orange with no power.
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Tuesday, October 20th, 2015 AT 9:55 AM
Tiny
LBEACH001
  • MEMBER
  • 5 POSTS
Nothing shows up, sorry
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Tuesday, October 20th, 2015 AT 4:57 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Www. Dropbox. Com/s/iid8w585pw56nvm/Monte%20Carlo%20Power%20Locks. Svg?Dl=0
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Tuesday, October 20th, 2015 AT 5:30 PM

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