
WARNING | t
| Disconnect the battery earth cable before working on the electrical system. |
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| On vehicles fitted with telematics system, activate the service mode for the telephone/telematics control unit -J526- before disconnecting battery -A- → Chapter. |
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| When re-connecting battery -A-, always adhere to correct sequence for connecting and disconnecting battery -A- → Electrical System; Rep. Gr.27. Deactivate the service mode for telephone/telematics control unit -J526- → Chapter. |

Note | t
| If SIM card is defective, request a new one by fax: |
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| Hotline No.: 0800/2 83 47 27 |
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| Fax No.: 0800/9 63 96 39 |
| The telematics system combines traffic information, the service call and the emergency call functions. |
| The telephone/telematics control unit -J526- also always includes a mobile phone. |
| If necessary, an emergency call or breakdown call can be made via a telematics service centre. With Telematics II, it is also possible to call up current traffic information. |
| The telephone/telematics control unit -J526- determines the exact position of the vehicle using GPS data, which is then also transmitted to the telematics service centre. |
| An emergency call is made automatically if the airbag control unit -J234- triggers a crash signal. |
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