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Pin 3 - W = OX1 Signal Wire
Pin 2 PB Pink/Blk = HTB (12v + Switched)
Pin 4 - BR = Ground
Pin 1 - BY Blk/Yel= HTR ECU Gnd trigger for heater
So pins 1 and 2 are both heater signals
Pin 3 is for the 5v signal to the ecu
Pin 4 is ground
The colors may not match but you can use a multimeter to check the rest or look on the plug and see if there is number markings on it
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