03 Battery maintenance: Checking functional state, fluid level and vent hose of battery
WM 030001 Battery maintenance: Checking functional state, fluid level and vent hose of battery
Technical values
Preliminary work
Information
No loads (e.g. opening doors, switching on light/radio, etc.) may be activated while the vehicle is jacked up and raised on the lifting platform.
The time is long enough for the battery to rest for a few minutes.
Information
Before checking the battery with a battery tester, the voltage at the battery must remain static for a short time.
The described sequence must be followed to ensure this rest period is observed.
1. Switch off all loads and remove ignition key.
2. Park the vehicle on the lifting platform.
3. Switch off lights, switch off ignition and remove ignition key.
4. Move backrest all the way forward. Move front seat all the way up and all the way forward.
5. Release the rear seat rail covers -arrows A- and remove them -arrows B-.
Removing rear seat rail covers
6. Move front left seat back and up as far as possible. Move backrest fully forward.
Removing front seat cover and fastening screws
7. Unclip the front seat trim by pulling it forwards -A-.
8. Fold the carpet sections forward and remove the two fastening screws -1-.
9. Fold the seat back as far as possible. With the seat in its folded position, move the seat forward again using the fore-and-aft adjustment.
10. Open the four tension hooks on the battery box cover using a screwdriver.
Opening battery box cover
11. Remove battery box cover with vent duct.
Checking functional state of battery
1. Connect battery tester to the vehicle battery.
=> Workshop Equipment and Special Tools Manual Section 3 Workshop Equipment Manual, 3.9.1 Battery testers/chargers
Connecting battery tester to vehicle battery
2. The values (A), the actual battery temperature, the battery type, etc. must be input on the battery tester. Follow the operating instructions provided for the tester.
3. After a short time, the result of the test will be displayed. The functional state and the charge state, for example, will be displayed, depending on the type of tester.
4. Continue the procedure using the values displayed on the battery tester. Example in -> 270601 Checking battery with battery tester 270601 Checking battery with battery tester.
Checking fluid level of low-maintenance battery and vent hose
Information
- This is the battery that is installed as standard.
- The maintenance-free battery has an inspection glass.
- The charge state and acid level of the battery can be checked via the inspection glass -B-.
Vent hose A and inspection glass B
- If a battery is more than 5 years old and the indicator of the inspection glass is colourless, replace the battery.
- If the battery has been charged, air bubbles can form under the inspection glass. Before carrying out a visual inspection, tap carefully on the inspection glass with something like the handle of a screwdriver.
Three different colour indications are possible:
Information
- Make sure that vent hose -A- is not kinked or damaged. If in doubt, replace it.
- Vent hose -A- must be inserted in the battery and in the battery box.
Vent hose A and inspection glass B
Battery with battery plugs, checking fluid level
CAUTION
Danger of injury.
- The accident prevention regulations must be observed when handling battery acids.
- Wear suitable protective clothing and goggles.
- Only illuminate the inside of the battery with a pocket lamp.
- Never illuminate the inside of the battery with a naked flame.
- Do not handle a naked flame or lit cigarettes near batteries.
- Observe the disposal regulations for batteries and sulphuric acid when disposing of batteries.
Information
- Use a commercially available battery filling bottle.
- The correct acid level of the battery is an important factor for long and efficient operation of the battery.
- When the acid level is too low, a capacity loss (performance loss) of the battery occurs, which is caused by the cell plates drying out. If the cell plates are not surrounded by electrolyte (battery acid), it will lead to corrosion of the lead plates, plate bridges and cell connectors. The result of the corrosion is that battery functioning cannot be guaranteed. The battery will become useless.
- If the acid level is too high, damage can occur when the battery acid (sulphuric acid/water mixture) leaks out of the battery.
Information
The Cayenne is fitted as standard with a battery with inspection glass. A battery with battery plugs is provided as a spare part for the Cayenne.
For batteries with battery plugs, the fluid level must be checked during maintenance and corrected if necessary.
1. Unscrew battery plugs.
2. Shine a pocket lamp into the battery. The electrolyte level of the battery must be at the protruding lug.
2.1. If the acid level is too low, refill with distilled water using the battery filling bottle.
3. Position battery plugs and screw on securely. => Tightening torque: 1.2 Nm (1.0 ftlb.).
Subsequent work
1. Position the battery box cover carefully. The cover must be fitted properly.
Fitting battery box cover
2. Attach the four tension hooks on the battery box cover and close using the screwdriver.
CAUTION
Risk of material damage to screw connections for seat and seat frame.
-> The fastening screws for seat and seat frame are coated and must be replaced after being unscrewed.
-> Before screwing in the new fastening screws, clean the thread holes with an M10 x 1.5 tap.
3. Move the seat in its folded position towards the rear -arrow A- and then tip it forward -arrow B-.
Securing seat
4. Screw in fastening screws -1-. => Tightening torque: 45 Nm (33 ftlb.)
5. Clip in front seat trim -C-.
6. Install the rear seat rail covers.
Carry out work instructions after disconnecting the battery.=> Work instructions after disconnecting the battery.