The electrical testing on vehicles up to model year 2001 is described with VAG 1526 multi-meter. The electrical testing on these vehicles can also be carried out using the VAS 5051 Vehicle Diagnostic, Testing and Information System. The electrical testing on vehicles from model year 2002 is described with the VAS 5051 Vehicle Diagnostic, Testing and Information System. The electrical testing can also be carried out using VAG 1526 multi-meter, except for several test steps. With model year change 2001 to 2002 the A/C system control will be changed over. For Audi allroad, the change-over of the A/C system is not performed with the model year change 2001 to 2002, instead it is a running change (implementation open, for vehicles with 4.2 Liter engine with start of production).
The resistance value of potentiometer in the positioning motors (Specification: 3.6 k to 5.7 k between terminal 1 and 3) can only be measured directly at the motor (connected in parallel). The resistance of the potentiometers in the positioning motors (between terminals 1 and 2 and between terminals 3 and 2) depends on the position of the positioning motor, and must always be measured with the positioning motors installed. The maximum specified value would not be obtained in test step 4.1 and 4.2. To obtain the maximum specified value, all the connectors on the other positioning motors would have to be disconnected (motors are connected in parallel). If the A/C Control Head -E87- detects the malfunction "Potentiometer short circuit to Ground (GND)" or "Open/ short circuit to B+", check all the potentiometer (one in each of the 5 positioning motors) and the wiring. If the read out for the DTC memory shows that more than one of the positioning motors is malfunctioning but
no DTCs are identified in the test step 4, test for short circuits in wiring to and between the individual positioning motors (e.g. between -V70- and -V71-).
here
The resistance value of potentiometer in the positioning motors (Specification: 3.6 k to 5.7 k between terminal 1 and 3) can only be measured directly at the motor (connected in parallel). The resistance of the potentiometers in the positioning motors (between terminals 1 and 2 and between terminals 3 and 2) depends on the position of the positioning motor, and must always be measured with the positioning motors installed. The maximum specified value would not be obtained in test step 4.1 and 4.2. To obtain the maximum specified value, all the connectors on the other positioning motors would have to be disconnected (motors are connected in parallel). If the A/C Control Head -E87- detects the malfunction "Potentiometer short circuit to Ground (GND)" or "Open/ short circuit to B+", check all the potentiometer (one in each of the 5 positioning motors) and the wiring. If the read out for the DTC memory shows that more than one of the positioning motors is malfunctioning but
no DTCs are identified in the test step 4, test for short circuits in wiring to and between the individual positioning motors (e.g. between -V70- and -V71-).
here
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