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Test step "2” > < List of electrical checks to be performed at connector C (to auxiliary heater components)

A4 Mk2

Test step “1”
Test step “1”
Glow plug for heater -Q9-
   
Vehicle diagnostic, testing and information system -VAS 5051A-, measurement mode: Multimeter, resistance measurement (0...100 Ω)
Test stepConnection to connector “C” → ChapterChecking of
l  Test conditions
–  Additional operations
SpecificationMeasures to be taken if reading does not match specification
1.1Contact “5” and contact “10”Glow plug for heater -Q9- and corresponding connections to auxiliary heater control unit -J364- 
–  Greater than 0.5 and less than 2 Ω (ohms)
–  Use current flow diagram to check and repair connection to glow plug for heater -Q9-
–  Use current flow diagram to check and repair earth connection
–  Replace glow plug for heater -Q9- → Chapter

  Note
t  Internal resistance of glow plug for heater -Q9- = 0.7 Ω+/-0.2 Ω (at 20 °C)
t  Resistances of less than 20 Ω can no longer be measured with the required accuracy using workshop equipment. The internal resistance test can therefore only be used to detect major component or wiring damage.
t  In the event of excessive resistance, check connector at glow plug for heater -Q9- for firm attachment and corrosion.
t  The earth connection for the glow plug for heater -Q9- is provided by way of a stud at the auxiliary heater housing. If applicable, check stud for firm attachment and corrosion.
t  The glow plug for heater -Q9- is designed for a voltage of 9.5 V. The voltage is regulated accordingly by the auxiliary heater control unit -J364-. At the rated voltage of 9.5 V, the current flow is approx. 11 A. If a voltage of 12 V (only permissible for a short period) is applied to a removed glow plug, the current flow is approx. 13 A and the glow plug starts to glow.
   

Test step "2” > < List of electrical checks to be performed at connector C (to auxiliary heater components)