EM55 Ford Interface unit
Overview
The EM55 has been designed to interface between the habitation electrical system and the Ford cab as used in the Auto-Trail Tribute range of motorhomes.
It provides access to cab signals such as engine run and door lock/unlock, provides fused outputs for fridge operation, split charging, & towing. It also has built in control for an electric step providing both automatic and manual operation combined with awning light control from the door lock and unlock signals.
The EM55 is fitted with an EM2 camera interface which is used to connect the reverse camera to the head unit monitor Auto-Trail use. For details of the EM2 please see the following article: EM2 - Camera Interface
Fuse Allocation and Switch settings
FUSE RATING USAGE
Fuse 1 15A Electric Step
Fuse 2 2A Electronics
Fuse 3 5A Awning Light
Fuse 4 10A Enroute USB
Fuse 5 15A Towing D+
Fuse 6 15A Towing Permanent
Fuse 7 20A D+ Fridge Element
Fuse 8 20A Vehicle Battery
Use only good quality fuses and DO NOT replace any fuse with one of a higher value than stated in the list above.
SWITCH USAGE
Switch 1 Step time - UP = short time, DOWN = long time (UP)
Switch 2 Door Lock step automation - UP = on (DOWN)
Switch 3 Door Unlock step automation - UP = on (UP)
Switch 4 Awning light with Lock/Unlock = UP = on (UP)
The standard settings, as requested by Auto-trail are given in brackets.
Connectivity
| CONNECTOR /PIN | FUNCTION | COLOUR / CABLE COLOUR | ||
| FC1 | Fridge | RED MOULDING | ||
| 1 | Fridge Ground | White/Black | ||
| 2 | Fridge Ground | White/Black | ||
| 3 | Fridge D+ | Red/Yellow | ||
| 4 | Fridge D+ | Red/Yellow | ||
| FC2 | Vehicle battery out | GREEN MOULDING | ||
| 1 | Battery Ground | White/Orange | ||
| 2 | Battery Ground | White/Orange | ||
| 3 | Battery + | Brown/Green | ||
| 4 | Battery + | Brown/Green | ||
| FC3 | VLM7 Supply | WHITE MOULDING | ||
| 1 | Tow + | Yellow | ||
| 2 | Tow D+ | Red | ||
| FC4 | User circuits | WHITE MOULDING | ||
| 1 | Enroute USB | Yellow/Blue | ||
| 2 | 12V Skts (in) | Yellow/white | ||
| 3 | Awning Light | Grey/Red | ||
| 4 | Low D+ | Orange/Yellow | ||
| 5 | Step operate sw | Blue/Red | ||
| 6 | Step Motor | Red/White | ||
| 7 | Low D+ | Orange/Yellow | ||
| 8 | Step limit sw | Blue/White | ||
| 9 | Step Motor | Red/Blue | ||
| FC5 | User circuits | WHITE MOULDING | ||
| 1 | Lock | Green | ||
| 2 | Not used | |||
| 3 | Perm 12V (in) | Brown/Yellow | ||
| 4 | Unlock +ve | White | ||
| 5 | Ignition | Blue | ||
| 6 | Hi lev Brake light | White/Blue | ||
| FC6 | Signal Inputs | WHITE MOULDING | ||
| 1 | Lock | Green | ||
| 2 | Engine Run | Brown/White | ||
| 3 | Not used | |||
| 4 | Unlock +ve | White | ||
| 5 | Ignition | Blue | ||
| 6 | Hi lev Brake light | White/Blue | ||
| FC7 | Vehicle battery in | WHITE MOULDING | ||
| 1 | Battery Ground | Black | ||
| 2 | Battery Ground | Black | ||
| 3 | Battery + | Red | ||
| 4 | Battery + | Red | ||
| FC8 | ||||
| 1 | Radio Feed out | Brown/Yellow | ||
| BZR | ||||
| 1 | Future Use | |||
| 2 | Future Use | |||
| FC10 | EM2 | |||
| 1 | Low D+ | Orange/Yellow | ||
| 2 | 12V Ground | White/Orange | ||
| 3 | NOT USED |