Volkswagen Golf Variant / Jetta. Manual - part 615

Danger of injury! Observe warning notices and safety regula‐

tions 

⇒ page 2

 !

– Switch off ignition and all electrical consumers.
– Connect red terminal clamp (+) to positive terminal of battery

-A- .

Note

In vehicles with start/stop function and battery monitor control unit

-J367- fitted, black terminal clamp (-) must be connected to body

earth. Connecting it to negative terminal of battery -A- will cause

start/stop system to malfunction.

– Connect black terminal clamp (-) to negative terminal of bat‐

tery -A- /negative connection point.

Charging starts after approximately 2 seconds.
Number of LEDs lit indicates charge level of battery -A- . Battery

-A- has been charged up once all lights are lit.
When battery -A- is fully charged, battery charger -VAS 5906-

automatically switches over to trickle charging.

Caution

Danger of sparking if charging terminals are removed too soon.

Terminate charging by pressing 

start/stop

 button.

Ending battery -A- charging process
– Press 

START / STOP

 button.

– Remove charger unit terminals from battery terminals.
– Disconnect battery charger -VAS 5906- from mains.

3.5

Midtronics -INC 940- battery charger

(only for USA/Canada)

WARNING

Danger of injury! Observe warning notices and safety regula‐

tions 

⇒ page 2

 !

WARNING

Do not test or charge batteries -A- whose magic eye is “col‐

ourless/light yellow”. Do not slave/jump start the vehicle!
Danger  of  explosion  when  checking  and  charging  or  slave/

jump starting
These batteries -A- must be replaced.

3. Charging battery A     

57

Observe ⇒  Operating instructions for Midtronics -INC 940- .

♦ Description of Midtronics -INC 940- battery tester

⇒ page 58

 .

♦ Charge battery -A- 

⇒ page 59

 .

♦ Dealing with Midtronics -INC 940- problems 

⇒ page 61

 .

3.5.1

Description of Midtronics -INC 940- bat‐

tery tester

Batteries -A- in VW vehicles are only allowed to be charged with

battery chargers approved by VW. In the USA/Canada, it is per‐

mitted for the Midtronics -INC 940- battery charger to be used.
Midtronics -INC 940- battery charger combines battery charging

with a charge condition checks and a battery test.
The following charging and analysis procedures apply to all bat‐

teries -A- , all battery installation locations (engine compartment

or luggage compartment) and battery application purposes (start‐

er battery or second/convenience battery).
– Always comply with the safety regulations, the regulations for

setting up the Midtronics -INC 940- battery charger, the display

menu/display buttons, LEDs and the operating procedures

described in the ⇒  operating manual of the Midtronics -INC

940- battery charger.

– Read through the ⇒  Operating instructions for Midtronics -INC

940- carefully.

Refer to ⇒ Self-study programme  No.  234 ; Vehicle batteries for

more information.

WARNING

Danger of injury! Observe warning notices and safety regula‐

tions 

⇒ page 2

 !

WARNING

No naked flames, sparking or smoking in the vicinity of batter‐

ies -A- .
The Midtronics -INC 940- battery charger must be switched off

before cables are connected or disconnected.
Do not remove cell plugs during charging.
Overcharging sulphated batteries -A- can lead to explosion.
Do  not  store  precision  tools  in  rooms  where  batteries  are

charged, because corrosion can ensue due to chemical reac‐

tions.

58

Do not test or charge batteries -A- whose magic eye is “col‐

ourless/light yellow”. Do not slave/jump start the vehicle!
Danger  of  explosion  when  checking  and  charging  or  slave/

jump starting
These batteries -A- must be replaced.

3.5.2

Charging battery -A-

Requirements

WARNING

Do not test or charge batteries -A- whose magic eye is “col‐

ourless/light yellow”. Do not slave/jump start the vehicle!
Danger  of  explosion  when  checking  and  charging  or  slave/

jump starting
These batteries -A- must be replaced.

♦ Perform initial setup (dealership number/date/time) ⇒  Oper‐

ating instructions for Midtronics -INC 940- .

♦ Check general information 

⇒ page 58

 .

♦ Perform visual check of battery -A- 

⇒ page 6

 .

♦ Determine whether battery type is “Standard” (wet battery) or

“AGM” (absorbent glass mat battery).

♦ Close all vehicle doors.

Note

♦

The temperature of the battery -A- must be at least 10 °C.

♦

For additional information, refer to the ⇒  operating manual of

the Midtronics -INC 940- tester.

Carry out following procedures:
– Switch off ignition and all electrical loads.
– Connect red terminal clamp (+) to positive terminal of battery

-A- .

Note

In vehicles with start/stop function and battery monitor control unit

-J367- fitted, black terminal clamp (-) must be connected to body

earth. Connecting it to negative terminal of battery -A- will cause

start/stop system to malfunction.

– Connect black terminal clamp (-) to negative terminal of bat‐

tery -A- /negative connection point.

– Connect Midtronics -INC 940- battery charger to mains.
– Set 

ON/OFF

 switch of Midtronics -INC 940- battery charger to

“ON”

3. Charging battery A     

59

(depending on type of test).

Note

♦

For additional information, refer to the ⇒  operating manual of

the Midtronics -INC 940- tester.

♦

If necessary, make a note of menu items required for “War‐

ranty” test type ⇒  Warranty service circular .

Midtronics -INC 940- battery charger tests battery -A- and starts

charging process. Display then shows one of three results, as well

as approximate charging time.

Result

Measures

Battery -A- OK

Battery -A- can be used again.

Charging required

♦ Test found low charge level.
♦ Charging starts and approx‐

imate charging duration is

displayed.

♦ Achieved cold-start per‐

formance and remaining

charging time are displayed,

and are updated regularly.

Replace battery -A-

Battery -A- defective. Charging

procedure is interrupted.

– Renew battery -A- ⇒  Elec‐

trical system; Rep. Gr.  27 .

Note

If Midtronics -INC 940- shows fault messages or text displays

other than those listed above, please refer to 

⇒ page 61

 .

WARNING

Stop charging if battery -A- is generating a lot of gas. Press

Stop

 button on front.

When charging and testing procedure has finished, Midtronics -

INC 940- battery charger displays “Battery good” or “Replace

battery” and total charging time.
There are three possible messages depending on individual cir‐

cumstance (printout for warranty, repair job, evaluation and filing):
♦ Generate test code (only possible after automatic charging

and test)

♦ Print last test result (for warranty)
♦ Display last test results

60