Fig. 501 General Error Symptoms; Troubleshooting - Webasto DBW 2010 Workshop Manual

DBW 2010 / 2016
5

Troubleshooting

5.1 General information
This section describes troubleshooting on the DBW 2010/
2016/2016 Rail heaters.
IMPORTANT
Troubleshooting work demands precise knowledge of the
structure and theory of operation of the various components
and must be carried out by trained personnel only.
If in doubt, refer to sections 2 or 3 for a description of how
the functions interact.
5.2 General error symptoms
The following table (Fig. 501) lists the possible general error
symptoms.
Error symptom
Malfunction in electrical system
Switch-on indicator lamp does not light up and heater does
not operate.
Fuse F2 blows.
Fuse F3 blows.
Heater operation OK, however operating indicator lamp
does not light up.
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Fig. 501 General error symptoms (Section 1 of 2)
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IMPORTANT
Error detection is generally limited to the localisation of the
defective components.
The following potential sources of malfunctions are not taken
into account and should always be checked so that they can
then be excluded as the cause of the particular fault:
Corrosion on connector
Loose contact on connector
Poor crimp contacts on plugs
Corrosion on lines and fuses
Corrosion on battery terminals
Conduct a function test in the vehicle after rectifying each
fault.
Possible cause
• No supply voltage,
• Fuses,
• Supply line to plug contacts of connector A of control
unit.
Short circuit in circulation pump or in supply line to heater.
Short circuit in supply line to heater/engine/nozzle holder
pre-heating unit (if installed).
Operating indicator lamp defective or wiring to operating
indicator lamp interrupted or short-circuited.
5 Troubleshooting
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