Audi Workshop Service and Repair Manuals

Note:

This test should only be performed with an operating and display unit with only one display (switch for heated rear window integrated in the -E87).

Special tools, testers and auxiliary equipment required

• ◆ Multimeter V.A.G 1715 (with current probe)
• ◆ Measuring tool set V.A.G 1594 A

Test requirements:

• ● All fuses OK:

=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations

• ‒ Switch ignition off.
• ‒ Remove operating and display unit -E87 .
• ‒ Pull the connector "F" off the operating and display unit -E87.
• ‒ → Connect multimeter between contacts 1 and 2 to measure voltage.

• ‒ Switch the ignition on.
• ‒ Specified value: approx. battery voltage
• ‒ Switch ignition off.
• ‒ Fit the connector "F" to the -E87.

• ‒ → Route lead -A- to connector "F" through V.A.G 1715's current probe.

Note:

All the connectors on the -E87 must be inserted

• ‒ Select the function "Current measurement via current probe" on V.A.G 1715.
• ‒ Start the engine.
• ‒ Switch on heated rear window at the -E87 (telltale in button lights).
• ‒ Specified value: display changes from approx. 0 A to less than 25 A
• ‒ Wait for approx. 10 minutes
• ‒ Specified value: The display changes from less than 25 A to approx. 0 A (telltale in button goes out)

Notes:

• ◆ The current probe may be influenced by stray current which could cause the display to show a low current reading when the rear window heating is switched off.
• ◆ If the ambient temperature is below 0 °C, the rear window heating remains activated until ignition is switched off (can be deactivated manually at any time). If, during the journey, the temperature rises above 0 °C, the rear window heating is deactivated after the operating period stored in -E87 (approx. 10 minutes) has elapsed.
• ◆ If the ambient temperature is above 0 °C, the rear window heating is automatically deactivated by -E87 after the operating period stored within it (approx. 10 minutes) has elapsed.