Emergency Battery, Switching Off/On

Emergency Battery, Switching Off/On

In order to avoid unnecessary discharge of the emergency (back-up) battery, it must always be switched off prior to disconnecting the vehicle battery, and switched back on after the vehicle battery is reconnected.
- Use VAS 5051 Vehicle Diagnosis, Testing and Information System in mode: "Guided Fault Finding"
- Enter appropriate model, equipment and model year information and press ">" to confirm.

After all control modules have been registered and DTC memories checked,
- Press "Go to"
- elect "Function/Component Selection"
- Select "Body"
- Select "Electrical Equipment"
- Select "01 - On Board Diagnostic (OBD) systems"
- Select "Telematic"
- Select "Functions -Telematic"
- Select "J526 - Telephone/Telematic Ctrl. Module, service mode disc. battery"
- If necessary, press ">" to advance

Switch off emergency battery
- Select/press button 3 - "Service mode activating (no load on emergency battery)"
- Follow the tester's prompts.

Switch on emergency battery
- Select/press button 1 - "Service mode deactivating (normal operating condition)"
- Follow the tester's prompts.