Remove/Install Trailer Recognition Control Unit - AR31.19-P-1300MFA
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Model 118.3/6, 177.0/1, 243.7, 247 with code 550 (Trailer coupling)
Model 243.7 with code 554 (Preinstallation for trailer hitch)
Fig 1: Trailer Recognition Control Unit Components Location - Model 118.3 With Code 550 (Shown On Model 177.0)
Shown on model 177.0 with code 550 (Trailer hitch)
| Risk of injury caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof. | No parts of the body or limbs should be within the operating area when the components are moving. | AS00.00-Z-0011-01A | |
| Topical note | Information on preventing damage to electronic components due to electrostatic discharge | AH54.00-P-0001-01A | |
| Notes on HANDS-FREE ACCESS | AH80.61-P-0001-01A | ||
| Remove/install | |||
| 1 | Switch off ignition and store transmitter key outside of transmitter range (min. 2 m). | ||
| 2 | Remove trim in trunk on right side. | Model 247.6 with code 550 (Trailer coupling) | AR68.30-P-4801MFX |
| Model 177.0 with code 550 (Trailer coupling) | AR68.30-P-4800MFA | ||
| Model 118.3, 177.1 with code 550 (Trailer coupling) | AR68.30-P-4800MFV | ||
| Model 243.7, 247.0/7 with code 550 (Trailer coupling) Model 243.7 with code 554 (Preinstallation for trailer hitch) |
AR68.30-P-4800MFB | ||
| Model 118.6 with code 550 (Trailer coupling) | AR68.30-P-4800MFD | ||
| 3 | Release and disconnect electrical connectors (1). | ||
| 4 | Remove nut (2) and take off trailer recognition control unit (N28/1). | ||
| 5 | Install in the reverse order. | ||
| 6 | Perform commissioning of trailer recognition control unit (N28/1). | When replacing trailer recognition control unit (N28/1). | |
| AD00.00-P-2000-06MFA | |||
| Check | |||
| 7 | Carry out function check of electrically unlocked trailer coupling. | Model 118.3/6, 177.0/1, 243.7, 247 with code 550 (Trailer coupling) | AR31.19-P-1451MFA |
| 8 | Perform function check of light signals on trailer socket. |