| Checking functions of heater controls with heater control unit -J65- |
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| Air recirculation mode is not possible in the
„Defrost“ (upward) air distribution setting. If active, air recirculation mode is deactivated. |
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| The control system is fitted with a gear mechanism for actuation of the flexible shaft for air distribution and temperature adjustment. Due to the gear mechanism at the heater and at the base plate of the heater control system, one turn of the switch produces two turns of the flexible shaft. |
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| The lamps for illumination of the buttons and rotary switches cannot be replaced separately. The entire heater control system must always be replaced. |
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| The rotary control switches and buttons are illuminated by way of terminals
„58s“ and
„58d“. |
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| Checking operation of air recirculation mode button and actuation of fresh air and air recirculation flap control motor -V154- → Chapter. |
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| Checking actuation of engine control unit on vehicles with supplementary air heater element -Z35- in
„Guided fault-finding“ function, TDI engine → Vehicle diagnostic tester. |
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| The heater control unit -J65- has no influence on the start/stop function. |
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| Vehicles with a start/stop system are not fitted with an additional coolant pump for the start/stop function. Depending on the vehicle engine, there may however be an electric coolant pump which is actuated by the corresponding engine control unit → Rep. gr.19. |
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