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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 1499 (Heating & Air Conditioning (On Board Diagnostic)) >> 01 On Board Diagnostic (OBD) >> Components activated by operating and display module, Climatronic Control Module J255, electrical testing >> Heated Rear Window Z1, testing

Heated Rear Window Z1, testing

WARNING: This page is about a different car, the 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • If a condition exists which prevents activation of the Heated Rear Window (short circuit in connection to rear window or to Rear Window Defogger Relay J9, open circuit in power supply to operating and display module, Climatronic Control Module J255 or open convertible top with Cabrio), the indicator lamp in the button lights on pressing the button in the operating and display module, Climatronic Control Module J255 and goes out again on releasing the button, however the heating is not activated.
  • If the voltage measured by the operating and display module, Climatronic Control Module J255 at terminal "30" drops below 12.5 V, the power of the Heated Rear Window is reduced, thus relieving the load on the Generator (GEN) (the electronic system of the operating and display module, Climatronic Control Module J255 reduces the activation duty cycle from 100% to 90 to 10%).
  • On vehicles up to VIN 399999 in Model Year 2005 (Saloon and Avant; gradual introduction for the Cabrio in week 46/04 without prior specification of any particular VIN ), the Heated Rear Window Z1 is activated directly by the operating and display module, Climatronic Control Module J255 (the relay for switching the current is installed in the operating and display module, Climatronic Control Module J255).
  • On vehicles as of VIN 400000 in Model Year 2005 (Saloon and Avant; gradual introduction for the Cabrio in week 46/04 without prior specification of any particular VIN ), the Heated Rear Window Z1 will no longer be activated directly by the operating and display module, Climatronic Control Module J255 (operating and display modules, Climatronic Control Module J255 with part No. index "AJ" onwards are no longer installed with a relay). On these vehicles, the Heated Rear Window Z1 is activated via the Rear Window Defogger Relay J9.
  • At ambient temperatures below 0 °C, the Heated Rear Window remains switched on until the ignition is switched off (manual deactivation is possible at any time). If the temperature during a driving cycle rises above 0 °C, the Heated Rear Window Z1 is deactivated on completion of the operating period stored in the operating and display module, Climatronic Control Module J255 (approx. 12 minutes).
  • At ambient temperatures greater than 0 °C, activation of the Heated Rear Window Z1 is terminated automatically on completion of the operating period (approx. 12 minutes) stored in the operating and display module, Climatronic Control Module J255 via the operating and display module, Climatronic Control Module J255.

Special tools and equipment 

NOTE:
  • All fuses OK
Fig 1: Disconnecting Connectors From Operating And Display Module, Climatronic Control Module J255
GW00021283Courtesy of VOLKSWAGEN UNITED STATES, INC.

Test for vehicles up to VIN "399999" in Model Year 2005 (Saloon and Avant; gradual introduction for the Cabrio in week 46/04 without prior specification of any particular VIN) 

NOTE:
  • As resistances of less than 10 Ω cannot be measured with sufficient accuracy using workshop equipment, it is not possible to establish a short circuit in the wiring or in the Heated Rear Window Z1.
  • If the resistance value is too high, check wiring to Heated Rear Window Z1 for open circuit and eliminate open circuit.
NOTE:
  • All connectors must be plugged in at the operating and display module, Climatronic Control Module J255.
NOTE:
  • Interference on the current probe measuring leads 1 2 may cause a slight current to be displayed with the Heated Rear Window switched off.
  • At ambient temperatures below 0 °C, the Heated Rear Window Z1 remains switched on until the ignition is switched off (manual deactivation is possible at any time). If the temperature during a driving cycle rises above 0 °C, the Heated Rear Window is deactivated on completion of the operating period stored in the operating and display module, Climatronic Control Module J255 (approx. 12 minutes).
  • At ambient temperatures greater than 0 °C, the Heated Rear Window is switched off automatically by the operating and display module, Climatronic Control Module J255 on completion of the operating period stored in the operating and display module, Climatronic Control Module J255 (approx. 12 minutes).

Test for vehicles as of VIN "400000" in Model Year 2005 (Saloon and Avant; gradual introduction for the Cabrio in week 46/04 without prior specification of any particular VIN) 

NOTE:
  • As resistances of less than 10 Ω cannot be measured with sufficient accuracy using workshop equipment, it is not possible to establish a short circuit in the wiring or in the Heated Rear Window Z1.
  • If the resistance value is too high, check wiring to Heated Rear Window Z1 for open circuit and eliminate open circuit.
NOTE:
  • All connectors must be plugged in at the operating and display module, Climatronic Control Module J255.
  • Measure voltage between contact "6" at connector - F  - and socket "13" (Ground (GND) connection) of test box.
  • Specified value: Voltage less than 2 V
NOTE:
  • Activation for Heated Rear Window can be checked for example by placing hand on heater coil area of rear window (heater wires must become warm).
NOTE:
  • At ambient temperatures below 0 °C, the Heated Rear Window Z1 remains switched on until the ignition is switched off (manual deactivation is possible at any time). If the temperature during a driving cycle rises above 0 °C, the Heated Rear Window is deactivated on completion of the operating period stored in the operating and display module, Climatronic Control Module J255 (approx. 12 minutes).
  • At ambient temperatures greater than 0 °C, the Heated Rear Window is switched off automatically by the operating and display module, Climatronic Control Module J255 on completion of the operating period stored in the operating and display module, Climatronic Control Module J255 (approx. 12 minutes).
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