The relay J36 controls the engagement circuit for the first additional heater resistance; the power supply for the relay arrives from the line for fuse F74 of the additional fuse box B98.The relay J37 controls the engagement circuit for the pther additional heater resistance; the power supply for the relay arrives from the line for fuse F76 of the additional fuse box B98.The coil for relay J36 is energized by a signal for the engagement of the first resistance for O25A - from pin 8 of M70.The coil for relay J37 is energized by a signal for the engagement of the second resistance for O25B - from pin 9 of M70.