| Trailer detector control unit -J345- |
| The trailer detector control unit -J345- is located behind the left side panel trim in the luggage compartment. |
Note | The trailer detector control unit -J345- detects from a power draw of minimum 5 W → Remark the „trailer operation“ and transmits this information to various control units via the CAN data bus. |
| The trailer detector control unit -J345- is supplied with information (light control) from the onboard supply control unit -J519- and convenience system central control unit -J393- via the CAN data bus. |
| 1)
| „Trailer operation“ can only be detected if at least turn signal indicators or side marker lights are switched on. |
| Fault detection and fault display: |
| The trailer detector control unit -J345- features self-diagnosis to facilitate fault finding. |
| For fault finding, use the systems described in chapter „Vehicle diagnosis, testing and information system“ in „Guided Fault Finding“ mode → Chapter. |
Note | For checking control unit, use socket tester -V.A.G 1537/A- or trailer socket tester -VAS 5800-. |
| Special tools and workshop equipment required |
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