Battery No-Load Voltage, Checking

Battery No-Load Voltage, Checking

Special tools, testers and auxiliary items required

• Multimeter (VAG 1526 B), Fluke (83) or equivalent

Test requirements

- Always heed the following, otherwise correct measurement is not guaranteed.

• If no load voltage measurement is carried out with the battery installed in vehicle, disconnect negative ( - ) battery terminal.

• The battery must not be loaded by connected power consumers for at least 2 hours before making measurements.

• The battery must not be charged for at least 2 hours before making the measurements.

CAUTION!
• On vehicles equipped with Audi Telematics by OnStar(R), switch-off the emergency (back-up) battery for the Telematic/Telephone Control Module prior to disconnecting vehicle battery.

• After reconnecting vehicle battery, re-code and check operation of anti-theft radio. Also check operation of clock and power windows according to Repair Information and/or Owner's Manual.

• After reconnecting vehicle battery on vehicles equipped with Audi Telematics by OnStar(R), switch-on the emergency (back-up) battery for the Telematic/Telephone Control Module

CAUTION!
• Switch off all electrical consumers.

• Switch the ignition off and remove ignition key.

- Disconnect negative ( - ) terminal from battery post.

Battery in engine compartment => [ Battery, Engine Compartment, Disconnecting and Connecting ] Battery, Engine Compartment, Disconnecting and Connecting

Battery in luggage compartment => [ Battery, Luggage Compartment, Disconnecting and Connecting ] Battery, Luggage Compartment, Disconnecting and Connecting

- Measure voltage between battery posts.

• Battery is OK if measuring instrument reading is 12.5 V or above.

• The battery no-load voltage must at no time be less than 12.5 Volts, otherwise the battery must be recharged immediately => [ Battery, Charging ] Battery, Charging.

- Repeat voltage measurement between terminals.

• Battery no-load voltage must not be less than 12.5 Volts.

- If no-load voltage is not OK, replace battery.

Install in reverse order of removal, noting the following:

- Reconnect battery. Required steps:

Battery in engine compartment => Battery, Engine Compartment, Disconnecting and Connecting

Battery in luggage compartment => Battery, Luggage Compartment, Disconnecting and Connecting