All engines
If the engine is so warm that it can be started without pre-heating, the pre-heating indicator lamp, of course, does not light. With a cold engine, it should light when the ignition key is turned to the first position. With a 55 kW turbodiesel, there is, however, a condition that the heating process does not end after opening the driver's door.
The pre-glow indicator lamp can also be checked in the installed state.
47 kW suction diesel: Remove the pre-heating relay from plug N12 of the central unit.
Connect terminal 9 in the relay plug to ground using an auxiliary wire.
55 kW turbodiesel: remove the lower left instrument panel trim.
Remove the automatic glow time control device from plugs 15 and 16 on top of the central unit and connect terminal 11 in the relay plug to ground using an auxiliary wire.
All engines: Turn the ignition key to the "pre-glow" position: the pre-glow indicator lamp should light, otherwise its wires or the lamp itself are faulty (for replacement, see the "Tools and instruments" chapter).
If the bulb now lights up, whereas previously it did not with the pre-glow relay or control unit installed, then the relay or control unit may be faulty. Check them as described in the previous section.
If the indicator light shows that the pre-glow time is too long or too short, it is possible that the cause is a faulty coolant temperature sensor.
[The information is posted on this resource www.VWMANUAL.ru]
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