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| Diagnostic tester -5019- |
| The heater control unit -J162- in the -B4W-/ -D4W- and in the -D3W- receives data from the electrical and electronic components: |
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| Coolant temperature sender for heater -G241- |
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| Overheating sensor -G189- |
| This data is processed by the heater control unit -J162- in the -B4W-/ -D4W- and -D3W-. The heater control unit -J162- then controls the combustion air blower -V6-, the glow plug for heater -Q9- and the metering pump -V54-. The heater control unit -J162- is equipped with a fault memory and recognises the fault that is currently present during the heating period. The current fault can be read as a fault code using diagnostic tester -5019-. Therefore, please connect the diagnostic tester -5019- immediately. |
| If fault code numbers are displayed, then the causes of the faults must be rectified according to the instructions in the fault table. The fault code numbers of the diagnostic tester must be cleared after the repair. After a road test, please use the diagnostic tester -5019- to read the heater control unit -J162- in the -B4W-/ -D4W- or -D3W- again. |
| The meanings of the fault code numbers are described in the fault table → Chapter. |
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