MerkaVa
Обычное реле переделывается:
http://www.chevy-niva.ru/viewtopic.php?t=13855
С регулируемой паузой - не переделывается:
http://www.chevy-niva.ru/viewtopic.php?p=681433#681433

8.12 In-Circuit Serial Programming
The PIC12C5XX microcontrollers with EPROM program memory can be serially programmed while in the end application circuit. This is simply done with two lines for clock and data, and three other lines for power,
ground, and the programming voltage. This allows customers to manufacture boards with unprogrammed devices, and then program the microcontroller just before shipping the product. This also allows the most
recent firmware or a custom firmware to be programmed.
The device is placed into a program/verify mode by holding the GP1 and GP0 pins low while raising the MCLR (VPP) pin from VIL to VIHH (see programming specification). GP1 becomes the programming clock
and GP0 becomes the programming data. Both GP1 and GP0 are Schmitt Trigger inputs in this mode. After reset, a 6-bit command is then supplied to the device. Depending on the command, 14-bits of program
data are then supplied to or from the device, depending if the command was a load or a read. For complete details of serial programming, please refer to the PIC12C5XX Programming Specifications. A typical in-circuit serial programming connection is shown in Figure 8-16.