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| Slide locking bar -1- of relay carrier connectors at onboard supply control unit on left of dash panel in direction of -arrow A-. |
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| Push locking catch -2- of plug-in connector of onboard supply control unit -J519- in direction of -arrow B-. |

Note | The plug-in connector of onboard supply control unit -J519- and of relay carrier on onboard supply control unit, left dash panel, can only be pulled off after the locking catches have been moved to the „OPEN“ position. |
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| Detach all connectors of onboard supply control unit -J519- and of relay carrier on the onboard supply control unit, left dash panel. |

Note | The number of connectors depends on the vehicle equipment level. |
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| Unclip onboard supply control unit -J519- and of relay carrier on onboard supply control unit, left dash panel, from retainers -arrows C-. |
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| Pull onboard supply control unit -J519- and of relay carrier on onboard supply control unit, left dash panel, downwards and to rear out of holder. |
| Installation is carried out in the reverse order. When installing observe the following: |

Note | The locking catches cannot be placed in the „CLOSED“ position until all connectors are „fitted“ correctly. |
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