Berlingo B9 Aftermarket alarm wiring

[Sol]

This should be the correct pin assignment for EH1 on the BSI: (27 looks like status; 29 is also similarly named) but see after this list, my suggestion.

EH1 engine: 40-channel white connector:
Connector pin Assignation
Pin 1 Input: fixed stop for the rear windscreen wiper motor
Pin 2 Input: not assigned / Ground for the hydraulic pump unit relay (307 CC)
Pin 4 Input: open door switch (CPO) on driver’s side and state of the vehicle’s openable
features
Pin 5 Input: open door switch (CPO) on passenger’s side and state of the vehicle’s
openable features
Pin 8 Output: common for the outside temperature sensor
Pin 9 Output: control for lowering rear right-hand electric window / control of the hydraulic
pump unit relay (307 CC)
Pin 10 Output: control for raising rear right-hand electric window / not assigned (307 CC)
Pin 11 Output: control for front courtesy light
Pin 12 Output: power supply for rear electric window switches
(Authorization to operate).
Pin 13 Input: open luggage compartment information
Pin 14 Output: rear right-hand stop (brake) light
Pin 15 Output: rear left-hand stop (brake) light
Pin 16 Output: control of additional stop (brake) lights
Pin 18 Input: outside temperature information
Pin 19 Output: control for lowering the rear left-hand electric window
Pin 20 Output: control for raising the rear left-hand electric window
Pin 21 Low wire for the LS CAN (body)
Pin 22 Output: Power supply + engine running
Pin 23 High wire for the LS CAN (body)
Pin 24 High wire for the LS CAN (body)
Pin 25 Input: control of front courtesy light information

EH1 engine, continued: 40-channel white connector:
Connector pin Assignation
Pin 26 Low wire for the LS CAN (body)
Pin 27 Input: status (locked/unlocked) of the driver’s side door lock information
Pin 28 Low wire for the LS CAN (comfort)
Pin 29 Input: state (locked/unlocked) of the driver’s side door lock information
Pin 30 High wire for the LS CAN (comfort)
Pin 31 Input: State of the rear right-hand door child lock
Pin 32 Output: control for courtesy light
Pin 33 Input: rear right-hand door open (CPO) switch
Pin 34 Input: rear left-hand door open (CPO) switch
Pin 35 Input: parking brake switch information
Pin 36 Input: State of the rear right-hand door child lock
Pin 37 Input: fastened front left-hand safety belt information
Pin 38 Low wire for the LS CAN (comfort)
Pin 39 Input: fastened front right-hand safety belt information
Pin 40 High wire for the LS CAN (comfort)

But you may want this input instead:
PB engine: 10-channel black connector:
Connector pin Assignation
Pin 1 Output: + Battery / (+ APC if the BSI shunt is not in place)
Pin 2 Input: hazard warning lights switch
Pin 3 Input: door locking request from inside passenger cell
Pin 4 Output: + accessories (+ ACC)
Pin 5 Output: + Battery (+ BATT)
Pin 6 Output: + CAN
Pin 7 Output: lighting of the switches
Pin 8 High wire for the LS CAN (comfort)
Pin 9 Output: system status / control of anti-theft alarm indicator light
Pin 10 Low wire for the LS CAN (comfort)

BSI plugs:
   

Schematic of central locking:

  Central Locking.pdf (Size: 353.56 KB / Downloads: 20)

I'd suggest using the toggle input from the dash button - but have never tried to see if it's on after eco mode kicks in, or is on the main B+ side and always active. 

6220 is the central locking switch, and wire signal 6224 going to BSI 10V NR pin 3 is the plip remote locking input A1. This is PB plug pin 3 on the BSI and is also used as the internal lock / unlock toggle from the dash button.