Checking components of auxiliary/additional heater: Audi A8 D3

🧭 Before you start

Fits: Audi A8 D3 (4E, 2002–2010)

Don't miss

• If a voltage of 12 V is applied to circulation pump V55 the current input is between 1 and 1.5 A.Internal resistance cannot be measured at recirculation pump V55 (this is prevented by the electronics in the circulation pump).

📋 Procedure

1. Remove auxiliary/additional heater .
2. Detach holder from auxiliary/additional heater and .
3. Use screwdriver to lever off cover (A).
4. Unplug connector (C) from auxiliary/additional heater.
5. Measure the resistance at connector (C) between contact "“1”" and the "“heater housing”".

6. Measure the resistance at connector (C) between contacts "“1”" and "“2”". [Note: Resistances of less than 1 Ω can no longer be measured with the required accuracy using workshop equipment. This test can therefore only be used to detect major component damage.Resistance characteristic curve of glow plug with flame monitor Q8 enables additional heater control unit J364 to detect whether a flame has formed in heater.If a voltage of 9 V is applied to the glow plug with flame detector, the current input is between 9 and 12 A.]
7. Unplug connector (B) from auxiliary/additional heater.
8. Measure the resistance at connector (B) between contact "“1”" and the "“heater housing”". [Note: If a voltage of 12 V is applied to combustion air blower V6 the current input is between 2 and 3 A.The internal resistance of the combustion air blower V6 is between 3 and 6 Ω~(40 Ω~if the combustion air blower has not been in operation for a lengthy period). Since resistances of less than 10 Ω can no longer be measured with the required degree of accuracy using workshop equipment, internal resistance testing can only be used to detect serious component damage.] [Note: A circulation pump is only fitted with auxiliary or auxiliary/additional heater version. Heaters used exclusively as additional heater have no circulation pump V55.]
9. Unplug connector (A) from auxiliary/additional heater.
10. Measure the resistance at connector (A) between the two contacts (contacts "“1”" and "“2”") and the "“heater housing”". [Note: If a voltage of 12 V is applied to circulation pump V55 the current input is between 1 and 1.5 A.Internal resistance cannot be measured at recirculation pump V55 (this is prevented by the electronics in the circulation pump).]

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