Test readings, control module connections

/ 9-5 (9600) / 1999 / 8. Body / Automatic Climate Control, ACC / Technical data / Test readings, control module connections

The following pages contain directions and test values for the ACC unit.

Remember:

•

Note the test conditions. Use common sense when assessing the test result.

•

First check that the control module is supplied with current and is grounded.

Then check all sensor inputs and signals from other systems.

Finally, check the control module outputs. Remember that the test readings do not indicate whether the actuator is working.

•

If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which should be checked more thoroughly.

•

The test readings indicated refer to calibrated FLUKE 88/97.

•

The test values indicate the pulse ratio and pulse length of the signal respectively. A test instrument for measuring pulse ratio and pulse width respectively must be used.

ACC unit, control module connections

> = greater than < = less than ~ = alternating current (LP: LOGIC PROBE P = select pulse; p = visible pulses).

pin nr	Cable colour	Component/function	In/Out	Test conditions	Between X and Y	Test reading
1	BK	Control module ground	In	Ignition ON	4-1	B+
2	RD/WH	Air recirculation motor power supply	Out	Activate fresh air	2-21	+12V for approx. 10s
2	RD/WH	Air recirculation motor power supply	Out	Activate air recirculation	2-21	-12V for approx. 10s
3		Parking heater connection	In	Activate parking heater	3-1	B+
4	BU/RD	Power supply +15	In	Ignition ON or activated control module	4-1	B+
5	OG/WH	B+ voltage ON fan control module	Out	Ignition ON	5-1	B+
6	GN/YE	Stepping motor, mixed-air, LH	Out	Ignition ON activate motor	6-25	50 Hz/ 50 % LP Hi-Lo
7	YE/BN	Stepping motor, mixed-air, LH	Out	Ignition ON activate motor	7-26	50 Hz/ 50 % LP Hi-Lo
8	RD/WH	Stepping motor, air distribution flap	Out	Ignition ON activate motor	8-27	50 Hz/ 50% LP Hi-Lo
9	RD/BU	Stepping motor, air distribution flap	Out	Ignition ON activate motor	9-28	50 Hz/ 50% LP Hi-Lo
10	WH/BK	Stepping motor, mixed-air, RH	Out	Ignition ON activate motor	10-29	50 Hz/ 50% LP Hi-Lo
11	RD/BU	Stepping motor, mixed-air, RH	Out	Ignition ON activate motor	11-30	50 Hz/ 50% LP Hi-Lo
12-13		No connection
14	GN/BU	Fan control module control voltage	Out	Ignition ON change fan speed	14-1	0-5 V
15		No connection
16	YE/GN	Solar sensor, B+ power supply and clock pulse	Out	Ignition ON	16-36	12 V, 25 Hz, TRIGG, 1%, LP Hi-Lo p
17	WH	Solar sensor test lead	In	Ignition ON	17-36	0-5V PULSETRAIN LP Hi-Lo p
18	BN/RD	Mixed-air temperature sensor, RH	In	Ignition ON	18-37	see Technical data
19	BN/OG	Mixed-air temperature sensor, LH	In	Ignition ON	19-38	see Technical data
20	OG/WH	Cabin temperature sensor	In	Ignition ON	20-39	see Technical data
21	GN/WH	Air recirculation motor power supply	Out	Activate air recirculation	21-2	+12V for approx. 10s
21	GN/WH	Air recirculation motor power supply	Out	Activate fresh air	21-2	-12V for approx. 10s
22	RD	Power supply +30	In	Power supply +30	22-1	B+
23	WH	Circulation pump	Out	Activate motor	4-23	B+
24	WT/GN	Heat exchanger shut-off valve	Out	Ignition ON	4-24	B+
25	VT/WH	Stepping motor, mixed-air, LH	Out	Ignition ON Activate motor	25-6	50 Hz/ 50 % LP Hi-Lo
26	YE/WH	Stepping motor, mixed-air, LH	Out	Ignition ON Activate motor	26-7	50 Hz/ 50% LP Hi-Lo
27	WH/YE	Stepping motor, air distribution flap	Out	Ignition ON Activate motor	27-8	50 Hz/ 50% LP Hi-Lo
28	RD/VT	Stepping motor, air distribution flap	Out	Ignition ON Activate motor	28-9	50 Hz/ 50% LP Hi-Lo
29	WH	Stepping motor, mixed-air, RH	Out	Ignition ON Activate motor	29-10	50 Hz/ 50% LP Hi-Lo
30	BK/VT	Stepping motor, mixed-air, RH	Out	Ignition ON Activate motor	30-11	50 Hz/ 50% LP Hi-Lo
31-32		No connection
33	GN	I-Bus (+)	In/Out	Ignition ON	33-1	2-3 V
34	WH	I-Bus (-)	In/Out	Ignition ON	34-1	2-3 V
35	WH/GN	Fan control module reference ground	Out	Ignition ON	5-35	B+
36	BU/RD	Solar sensor, ground	Out	Ignition ON	16-36	12 V, 25 Hz, TRIGG, 1%, LP Hi-Lo p
37	VT	Mixed-air temperature sensor, right ground	Out	Ignition ON	18-37	see Technical data
38	BN/WH	Mixed-air temperature sensor, LH ground	Out	Ignition ON	19-38	see Technical data
39	YE/WH	Inside temperature sensor ground	Out	Ignition ON	20-39	see Technical data

Test readings, control module connections

Our Friends