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| Unplug connectors -D- and -F- from operating and display unit, Climatronic control unit -J255-. |
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| Connect test box adapter cable -V.A.G 1598/12- to unplugged connector -D-. |
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| Connect test box -V.A.G 1598A- to adapter cable -V.A.G 1598/12- |
| Check on vehicle up to chassis number “399999” in Model Year 2005 (Saloon and Avant) and “012912” in Model Year 2005 (Cabrio) → Parts catalogue |
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| Measure voltage between contact “5” at connector -F- and socket “13” (earth connection) of test box. |
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| Specification: approx. battery voltage |
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| Measure resistance between contact 6 at connector -F- and socket “13” (earth connection) of test box. |
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| Specification: Resistance approx. 0.5.....1.0 Ω (ohms) |
Note | t
| 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-. |
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| Plug connectors -D- and -F- to operating and display unit, Climatronic control unit -J255- (all connectors are now plugged in at operating and display unit, Climatronic control unit -J255-). |
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| Guide wire to connector -F- contact “6” through 50 A current probe -VAS 5051/9-. |
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| On vehicle diagnostic, testing and information system -VAS 5051A-, set “Multimeter measurement: 50 A current probe” mode. |
Note | All connectors must be plugged in at the operating and display unit, Climatronic control unit -J255-. |
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| Switch on heated rear window at the operating and display unit, Climatronic control unit -J255- (indicator lamp in button lights). |
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| Specification: Display switches from approx. 0 A to less than 25 A |
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| Wait approx. 12 minutes. |
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| Specification: Display switches from less than 25 A to approx. 0 A (indicator lamp in button goes out) |
Note | t
| Interference on the current probe may cause a slight current to be displayed with the heated rear window switched off. |
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| 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 unit, Climatronic control unit -J255- (approx. 12 minutes). |
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| At ambient temperatures greater than 0 °C, the heated rear window is switched off automatically by the operating and display unit, Climatronic control unit -J255- on completion of the operating period stored in the operating and display unit, Climatronic control unit -J255- (approx. 12 minutes). |
| Check on vehicle as of chassis number “400000” in Model Year 2005 (Saloon and Avant) and “012913” in Model Year 2005 (Cabrio) → Parts catalogue |
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| Measure voltage between socket “12” (terminal “30”) and socket “13” (earth connection) of test box. |
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| Specification: approx. battery voltage |
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| Measure resistance between contact “6” at connector -F- and socket “13” (earth connection) of test box. |
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| Specification: Resistance approx. 10. ... 100 Ω (ohms) |
Note | t
| 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-. |
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| Plug connectors -D- and -F- to operating and display unit, Climatronic control unit -J255- (all connectors are now plugged in at operating and display unit, Climatronic control unit -J255-). |
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| On vehicle diagnostic, testing and information system -VAS 5051A-, set “Multimeter measurement, voltage measurement (20 V DC)” mode. |
Note | t
| All connectors must be plugged in at the operating and display unit, Climatronic control unit -J255-. |
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| Measure voltage between contact “6” at connector -F- and socket “13” (earth connection) of test box. |
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| Specification: Voltage less than 2 V |
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| Switch on heated rear window at the operating and display unit, Climatronic control unit -J255- (indicator lamp in button lights). |
Note | Actuation of heated rear window can be checked for example by placing hand on heater wire area of rear window (heater wires must become warm). |
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| Wait approx. 12 minutes. |
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| Specification: Display switches from approx. battery voltage to less than approx. 2 V (indicator lamp in button goes out) |
Note | t
| 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 unit, Climatronic control unit -J255- (approx. 12 minutes). |
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| At ambient temperatures greater than 0 °C, the heated rear window is switched off automatically by the operating and display unit, Climatronic control unit -J255- on completion of the operating period stored in the operating and display unit, Climatronic control unit -J255- (approx. 12 minutes). |
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