Checking actuation and electrical connections of auxiliary/additional heater — AUDI

🧭 Before you start

Fits: Audi A8 D3 (4E, 2002–2010)

• Special tools named: VAS 5051

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• Internal resistance of metering pump V54 = 4.1 Ω +/- 0.2 ΩChecking actuation of the metering pump V54"Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.

📋 Procedure

1. All fuses OK as per current flow diagram
2. BatteryA adequately charged
3. Fault memory interrogated and any faults displayed eliminated "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051 [Note: "“Electrical check”" function is not described in this Workshop Manual. The Manual merely gives a brief outline of the checking of individual components.Electrical checking is to be performed as described in the guided fault-finding routine "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.]
4. Switch off ignition.
5. Move the lock carrier to service position General body repairs, exterior50.

6. Remove the right headlight Electrical system94.
7. Unplug the connectors (B) and (A) from the heater. [Note: Pay attention to the correct sequence when unplugging connectors (B) and (A). If connector (A) is unplugged first, a fault may be stored in the supplementary heater control unit J364 and this can only be erased after unplugging the connectors and plugging them back in in the right order.Plug in connector (A) and then connector (B) at the supplementary heater control unit J364.]
8. Additional operations
9. Approx. battery voltage
10. Use current flow diagram to check and repair power supply and earth connection [Note: Depending on last operating status and coolant temperature in auxiliary/additional heater, no-load current input of auxiliary/additional heater may be up to max. 60 mA for a period of up to 5 hours following switch-off. During this period, cooling of coolant is calculated by additional heater control unit J364 for time following switch-off.At the latest 5 hours after switch-off, no-load current input of additional heater control unit J364 is less than 2 mA.The no-load current input of the remote control receivers for auxiliary heater R64 (Telestart "“T70”" and Telestart "“T90”" / "“T91”" version) is less than 1 mA (the current input increases as soon as a transmission signal is received).]
11. Additional operations
12. Greater than 3 and less than 20 Ω
13. Use current flow diagram to check and repair wiring
14. Replace the metering pump V54 [Note: Internal resistance of metering pump V54 = 4.1 Ω +/- 0.2 ΩChecking actuation of the metering pump V54"Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.]
15. Additional operations
16. Greater than 10 and less than 30 Ω
17. Use current flow diagram to check and repair wiring
18. Replace heater coolant shutoff valve N279 [Note: Heater coolant shutoff valve N279 is only fitted on vehicles with "“Auxiliary heater”" optional extra.Checking actuation of the heater coolant shut-off valve N279"Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.Current input of heater coolant shutoff valve N279 is approx. 1 A]

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