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hey guys, i have read over 20 threads on this subject but havent been able to get anywhere. Power door locks did not work when i bought my 95 blazer. so i replaced the switch as it looked old and worn. still nothing, so i went on to replace the relay. again still no locks. All fuses in the side of the dash are good. what else can i do? what can i check
I've an 02 Blazer 4 DR 4WD, and just today, the door locks are not working. I checked the fuses (13, 14) and they were good. I looked for a relay rack behind the glove box, and there was none. What looked like a radio antenna box was there, and above that was the dash duct work. I haven't checked to see in the windows are working. It's 35 degrees today and I got running around to do. But the door locks don't work. I manually locked them to see if they will stay locked, but this is something that needs to be repaired, and right now, I am my best choice for a mechanic Been outta work for a year now.
Found the issue, with mine at least. In the under hood fuse box, there is a 3 AMP fuse, the MIR/LKS, to the left of the LIFT GLASS and FOG LP relays. The 3 AMP fuse sits directly above a 15 AMP fuse for FOG LPS.
I had a spare 3 AMP in the spare fuses on the right side of fuse panel.
Is it both lock and unlock and both door switches that are faulty?
Does the remote work?
George
no remote. 99 blazer door locks. i have checked and replaced all 3 fuses even though they looked OK. Did power drops on both sides of all fuses and still no luck. Replaced the relay block thinking an internal issue. No luck. Replaced one relay with a new one. Moved it around to the other 2 spots, no luck. Did voltage checks on the back side of both switches. Power was present, no luck. Power is making it to relay block. Not sure if it's going out to the actuators because of the poor location of relay block, can't get a good read on wires. All 4 locks and the lift gate went out at the same time. Can't find g201 and g200 ground connections iaw schematic.
It HAS to Be a common point problem. ANYONE have a clue?
no remote. 99 blazer door locks. i have checked and replaced all 3 fuses even though they looked OK. Did power drops on both sides of all fuses and still no luck. Replaced the relay block thinking an internal issue. No luck. Replaced one relay with a new one. Moved it around to the other 2 spots, no luck. Did voltage checks on the back side of both switches. Power was present, no luck. Power is making it to relay block. Not sure if it's going out to the actuators because of the poor location of relay block, can't get a good read on wires. All 4 locks and the lift gate went out at the same time. Can't find g201 and g200 ground connections iaw schematic.
It HAS to Be a common point problem. ANYONE have a clue?
The truck did not come with a remote, you lost the remote or the remote also does not work along with any combination of door lock/liftgate buttons and switches?
The truck did not come with a remote, you lost the remote or the remote also does not work along with any combination of door lock/liftgate buttons and switches?
George
I found the problem. There was no difference of potential on the passenger door lock switch. It was caused by a powerfeedback between the master switch and the passenger switch. I pulled the switch and saw the corrosion had bridged the contacts creating the feedback short.
08-23-2013, 01:11 PM
power door locks not working
