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Removing and installing earth cable with battery monitor control unitJ367 > < Exploded view of battery - Avant

A4 Mk3

Disconnecting and connecting battery
Disconnecting and connecting battery
  Caution
Risk of accident.
Contrary to the following description, the battery must be disconnected with the ignition SWITCHED ON when working on pyrotechnic components (e.g. airbags, belt tensioners) → Rep. gr.69.
Vehicles with TDI engine (SCR)
t  After the ignition is switched off, the reducing agent is automatically drawn back into the active tank for reducing agent from the metering line going to the injector for reducing agent -N474-.
t  Before working in this area, you must therefore wait until the reducing agent has been completely drawn out of the metering line; this can take up to 10 minutes after the ignition has been switched off.
t  For the same reason, it is important to wait until the reducing agent has been drawn back (i.e. 10 minutes) before disconnecting the battery.
Disconnecting
–  Switch off ignition and take out ignition key.
   
Saloon:
–  Lift luggage compartment floor panel by handle and hook handle onto rear lid seal.
–  Remove nut -1- and detach cover -2- for tool kit.
  A27-10139
Avant:
–  Take out luggage compartment floor -2-.
–  Unscrew nut -1- and take out temporary spare wheel -3- (if fitted).
  A27-10169
Cover for negative terminal (version 1):
–  Lift up cover -1- over negative terminal slightly -arrow-.
–  Slacken off nut several turns and disconnect battery clamp -2- of earth cable from battery terminal.
  A27-10141
Cover for negative terminal (version 2):
–  Open cover -1- over negative battery terminal.
–  Slacken off nut -3- several turns and disconnect battery clamp -2- of earth cable from battery terminal.
  A27-10115
Connecting
l  Tightening torque: Saloon → Chapter, Avant → Chapter.
–  Unplug electrical connector -2- at battery monitor control unit -J367--item 1-.
–  When connecting battery, attach battery clamp of earth cable to negative battery terminal „–“ by hand and tighten nut -3-.
–  Reconnect connector at battery monitor control unit -J367-.
The following measures are required after re-connecting the battery:
t  Activate automatic open/close function of electric window regulators - see → Owner's Manual.
t  Interrogate event memories of all control units and erase „Low voltage“ fault display → Vehicle diagnostic tester.
  Note
After reconnecting the voltage supply, it is possible that the ESP warning lamp will not go out until the vehicle has been driven several metres.
  A27-10170

Removing and installing earth cable with battery monitor control unitJ367 > < Exploded view of battery - Avant