Check battery - AR54.10-P-1129-01A

Risk of explosion  caused by oxyhydrogen gas. Risk of poisoning and caustic burns  caused by swallowing battery acid. Risk of injury  caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries

No fire, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and glasses. Only pour battery acid into suitable and appropriately marked containers.

AS54.10-Z-0001-01A

On model 414 the battery has to be disconnected for the tests to avoid any damage.

Perform test for remaining vehicles with battery installed and connected where possible. Do not connect tester to jump start or charging terminal point, always connect it directly with the battery.

Battery tester

All test steps and entries must be performed thoroughly, otherwise the test result will be distorted.

Test prerequisites:

• Tester with software release 2.0
• Ignition off
• Rotary light switch in position "0"
• Audio component (e.g. radio) switched off
• Battery voltage higher than 12.4 V
• Good contact of the tester on the battery

If the message "Surface voltage" is displayed during the test, the tester has detected that the battery voltage is apparently too high. This increased voltage can be reduced as follows:

• Battery installed: Decrease increased voltage as per the specifications of the tester (e.g. switch on driving lights).
• Battery removed: reduce increased voltage using a suitable volt/amp(s) tester (load battery for approx. 60 s with 20 A to 30 A amps).

As an example, the test procedure for passenger cars is described below.

1. Clip tester (1) on to battery.

   Once the tester is connected the current measured battery voltage is displayed for approx. 2 s. If a so-called "System noise" is detected by the tester, check whether all consumers are switched off and wait (for approx. 2 min), until the quiescent current is minimized and the bus systems are switched off.

   Fig 1: Identifying Battery Clip Tester

   Courtesy of MERCEDES-BENZ USA
2. Follow the menu and select according to the situation:
   • In vehicle (battery connected to on-board electrical system)
   • Not in vehicle (battery disconnected from on-board electrical system)

   Confirm selection with "Enter".

   Fig 2: Display Battery Selection - According To Situation

   Courtesy of MERCEDES-BENZ USA
3. Follow the menu and select according to the situation:
   • - 114 AH (battery capacity 12 - 114 Ah)
   • AH > (battery capacity

   Confirm selection with "Enter".

   Fig 3: Display Battery Selection - Battery Capacity

   Courtesy of MERCEDES-BENZ USA
4. Follow menu and select battery type:
   • Normal
   • VRLA

   Confirm selection with "Enter".

   Fig 4: Display Battery Selection - Battery Type

   Courtesy of MERCEDES-BENZ USA
5. Follow the menu selection and select the test standard for the cold cranking amps.

   The test standard is printed on behind the specification of the cold cranking amps.

   If the imprint of the test standard is not available, select the cold cranking amps "EN".

   Example: 12 V 46 Ah 420 A  ↓ Select EN.

   Confirm selection with "Enter".

   Fig 5: Selection Of Battery Testing For Cold Cranking Amps

   Courtesy of MERCEDES-BENZ USA
6. Read off cold cranking amps and enter in tester.

   Example: 12 V 46 Ah 420 cold cranking amps  → 420 A. Confirm input with "Enter".

   The battery test starts after confirmation of the cold cranking amps entry.

   The test result or one of the following messages appears after approx. 15 s:

   • Test code → Step 7
   • Vehicle model → Step 9
   • Temperature > 0 °C/< 0 °C → Step 10
   • Before charging/After charging → Step 11
   • Surface voltage DETECTED (see above)
   Fig 6: Display Test Result Of Cold Cranking Amps

   Courtesy of MERCEDES-BENZ USA
7. Read off test code with "Enter" and continue accordingly:
   • "Battery in good condition":

     No further measures required.

   • "Charge and test":

     Fully charge battery and retest (battery voltage > 12.4 V).

   • "Replace battery":

   Replace battery if this message appears.

8. Print out test code and file in a tamperproof manner.
9. Follow the menu and select test mode:
   • Cars
   • Taxi

   Confirm selection with "Enter".

   Fig 7: Selection Of Test Mode - Cars And Taxi

   Courtesy of MERCEDES-BENZ USA
10. Follow the menu and select test mode:
    • > 0 °C
    • < 0 °C

    Confirm selection with "Enter"

    Fig 8: Selection Of Test Mode - Above 0°C And Below 0°C

    Courtesy of MERCEDES-BENZ USA
11. Follow the menu and select test mode:
    • BEFORE CHARGE
    • AFTER CHARGE

    Confirm selection with "Enter".

    Fig 9: Selection Of Test Mode - Before Charge And After Charge

    Courtesy of MERCEDES-BENZ USA
12. Perform additional menu-assisted function (e.g. starting several times and switching on consumers).

    Only in taxi test mode if displayed in menu.