Sequence Test

This test is made with engine warm and running at 1100 RPM, Test checks mode door operations and blower speed changes and when they should occur in relation to pushbutton actuation. If should be noted that various pushbutton positions referred to are accomplished by rotating mode knob on the C-4144 or C-4315 tester and also by pushing buttons on control panel.

To perform this test, set fester voltmeter knob at Blower Volts and mode knob at left "PARK" position. As buttons are AUTO-TEMP II SEQUENCE CHART depressed to the various positions, system will perform switching operations shown in "Auto-Temp II Sequence Chart" contained in this article.

	Tester Controls
Push Button Switch	Voltmeter Switch	Mode Switch	Outside Air Door Position	AC Door Position	Heat Door Position	Defrost Door Position	Blower Motor Speed
OFF	Blower Volts	A/C	0%	Open or Closed	Closed or Open	Closed or Bleed	Off
LO-AUTO	Blower Volts	Park	0%	Open or Closed	Closed or Open	Closed or Bleed	On
		A/C	100%	Open	Closed	Closed	M1
			100%	Open	Closed	Closed	M1 to M2
			100%	Open	Closed	Closed	M2 to M3
			20%	Open	Closed	Closed	M3
			20%	Open	Closed	Closed	M3 to Hi
			20%	Open	Closed	Closed	Hi
		Heat	20%	Open	Closed	Closed	Hi
			20%	Open	Closed	Closed	Hi to M3
			100%	Open	Closed	Closed	M3
			100%	Open	Closed	Closed	M3 to M2
			100%	Open	Closed	Closed	M2 to M1
			100%	Open	Closed	Closed	M1 to Lo
			100%	Closed	Open	Bleed	Lo
			100%	Closed	Open	Bleed	Lo to M1
			100%	Closed	Open	Bleed	M1 to M2
			100%	Closed	Open	Bleed	M2 to M3
			100%	Closed	Open	Bleed	M3 to Hi
			100%	Closed	Open	Bleed	Hi
		A/C	100%	Closed	Open	Bleed	Hi to M3
			100%	Closed	Open	Bleed	M3 to M2
			100%	Closed	Open	Bleed	M2 to M1
			100%	Closed	Open	Bleed	M1 to Lo
			100%	Closed	Open	Bleed	Lo
			100%	Open	Closed	Closed	Lo to M1
			100%	Open	Closed	Closed	M1 to M2
			100%	Open	Closed	Closed	M2 to M3
			20%	Open	Closed	Closed	M3
			20%	Open	Closed	Closed	M3 to Hi
			20%	Open	Closed	Closed	Hi
HI-AUTO	Blower Volts	A/C	20%	Open	Closed	Closed	Hi
		Heat	20%	Open	Closed	Closed	Hi
			20%	Open	Closed	Closed	Hi to M3
			100%	Open	Closed	Closed	M3
			100%	Open	Closed	Closed	M3 to M2
			100%	Closed	Open	Bleed	M2
			100%	Closed	Open	Bleed	M2 to M3
			100%	Closed	Open	Bleed	M3 to Hi
		A/C	100%	Closed	Open	Bleed	Hi
			100%	Closed	Open	Bleed	Hi to M3
			100%	Closed	Open	Bleed	M3 to M2
			100%	Open	Closed	Closed	M2
			100%	Open	Closed	Closed	M2 to M3
			20%	Open	Closed	Closed	M3
			20%	Open	Closed	Closed	M3 to Hi
			20%	Open	Closed	Closed	Hi
LO-DEFROST	Blower Volts	A/C	20%	Closed	Bleed	Open	Hi
		Heat	20%	Closed	Bleed	Open	Hi
			20%	Closed	Bleed	Open	Hi to M3
			100%	Closed	Bleed	Open	M3
			100%	Closed	Bleed	Open	M3 to M2
			100%	Closed	Bleed	Open	M2
			100%	Closed	Bleed	Open	M2 to M3
			100%	Closed	Bleed	Open	M3 to Hi
			100%	Closed	Bleed	Open	Hi
		A/C	100%	Closed	Bleed	Open	Hi to M3
			100%	Closed	Bleed	Open	M3 to M2
			100%	Closed	Bleed	Open	M2
			100%	Closed	Bleed	Open	M2 to M3
			20%	Closed	Bleed	Open	M3
			20%	Closed	Bleed	Open	M3 to Hi
			20%	Closed	Bleed	Open	Hi
HI-DEFROST	Blower Volts	Heat	100%	Closed	Bleed	Open	Hi
Blower Motor Speeds Hi-Maximum Speed M2-One speed down from M3 Lo-One speed down from M1 M3-One speed down from Hi M1-One speed down from M2