crwdns2915892:0crwdne2915892:0
This repair is for GM vehicles with Vehicle Anti Thief System (VATS) or Pass-Key systems that have the black “Chip” in the key and intermittent No Starts with the dreaded 10 minute wait. If you have a GM vehicle that has the no start issue you can try pulling the module down from under the dash and tap on it with you finger or slightly twist the module box with it still plugged in. If the vehicle starts after doing that I have found it may have a diode in the module with a bad solder joint. Remove the module and remove the board from inside. On the backside of the board I generally re-flow the solder on all the pins on the connector. I then re-flow the solder on the 7 larger diodes and the 2 larger blue color resistors located between the diodes. Most likely you will find that one of the diodes will not allow the solder to flow. You have to remove that diode using a solder sucker to get all the solder from the connections. Be careful not to damage the eyelets around the holes the diodes are mounted thru. The diode will come out easily if there is no solder, so if you are using force then something is wrong. Try to solder the diode back into place on that connection and use the solder sucker again until the diode comes out easily. Clean the board with flux and a tooth brush and maybe a pencil eraser being careful not to damage the eyelets. Then solder the diode back in and if the solder flow smoothly then the repair is finished. Reassemble and reinstall. It is plug and play so start it up.
crwdns2942213:0crwdne2942213:0
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Picture #1: Remove the VATS MODULE
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Open Module being careful not to break off these two tabs
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The board lifts straight up out of the box
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The tip of the screw driver is at the joint that has failed. Generally I re-flow the solder on all 7 of the larger diodes and both of the blue color resistors in between the diodes. I also re-flow all the joints on the black wire harness connector.
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crwdns2935267:0crwdne2935267:0Desoldering Pump$3.99
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If the solder will not flow smoothly on any of the joints, the joint will require cleaning. Mark the direction the diode is in and remove the solder from the joints using a solder sucker. Remove diode. Add flux and brush the area being very careful not to damage the eyelets on the board.
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You may even have to use a pencil eraser. Be sure not to damage the eyelets on the board. After it is clean reinstall the diode in the same direction (silver band toward the edge of the board) and solder in place. Place the board back inside the box and close the lid. Plug it into the harness and start the engine.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
crwdns2947412:03crwdne2947412:0
I have a 1998 chevy k1500. Removed module about a year ago, and truck had run fine till I unhooked battery for something else, without module connected, about a week later truck stopped running it will run for a few seconds and die. Tried to reinstall module and relearn with key but nothing. Is this because battery was disconnected without the module. If so how can I fix this?
Thanks
I'm sorry I didn't read this question until today.
Anyway the 1998 Chevy K1500 is a different system than this older PATS design. Your system has a learning feature and by following the relearn procedure, it will relearn the key or New Key/Lock cylinder you are installing. I have run into only one problem over the years that does not allow the relearn to "Start". It is because the plastic switch mounted in the housing above the lock cylinder is worn or broken off and does not register the key is inserted. It is a simple on/off switch and can be tested mounted in the housing or remover, but removing the switch can give you a false positive test because the button may be wore enough to prevent the key from pressing upward enough to open the contacts.
The switch is small, white, two wire and located in the ignition key housing, directly above the key. It was to be rotated to removed. In that housing you'll see three wires plugged in and the white switch to the right and in. I don't see any way to post pictures.
Ed D -
Will this stop my keyless entry my fob not to work when I turn the ignition on three times and then try to reset my fob. It doesn’t work unlocks the trunk and the driver side door and the passenger door stays locked. I put a new body control modular in and still having the same problem, can’t figure it out.
