Fiat Ducato 244 – high beam

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The high beam on the Fiat Ducato 244 is switched on via the steering column switch, which sends a ground signal to the H090 control unit and activates the indicator light in the instrument panel. At the same time, ground is applied via pin 6 (H090) to pin 23 (B001) via a brown-green cable (MV) to the coil (terminal 86) of relay T14 in the fuse relay box (right engine compartment), whereupon the relay is activated and forwards the permanent plus present at terminal 30 to the two high beam lamps F010 and F011 via terminal 87.

The excerpted representation of the circuit diagram is from the Windows program e-Learn FIAT Ducato removed.

In Germany, additional high beam lamps may not be switched on together with the main beam and are only permitted as separately switchable “work” headlights.

version 1

A LightBar can therefore be controlled via an additional relay, a fuse and a switch so that only the high beam is switched on when the switch is switched off. When the switch is turned on, the LightBar is also turned on

The circuit is then: relay (terminals 30 and 85) to permanent plus, branch from cable (MV) to switch (input), from switch (output) -> relay (terminal 86) to ground, fuse (input) to relay (terminal 87), fuse (output) to the plus connection LightBar, minus connection LightBar to ground.
If the switch is switched on and the high beam is activated via the steering column switch, ground is connected to the relay (terminal 86) via the cable (MV) and the relay is switched on. Permanent plus from terminal 85 is switched through to the LightBar via the closed relay contact and the fuse via terminal 87.
If the switch is turned off, there is no longer a connection to the high beam switch lever and the LightBar remains off when the high beam is activated.

Variant 2

If the LightBar is to be switched independently of the high beam, the wiring can also be done independently of the high beam circuit, i.e. battery -> fuse -> via relay (terminal 30) and closing relay contact (terminal 87) -> LightBar. The switch is set to permanent plus (terminal 30) and (relay contact 85) and (relay contact 86) to ground.
When the switch is turned on, the relay pulls in and forwards continuous plus to the LightBar.

Variant 1 + 2

A combination of both functional variants can be implemented using a changeover switch (WS - 3 positions): it either connects or disconnects the branching connection to the MV cable (MV) terminal 86 from relay T14, or closes ground to terminal 86 accordingly of the additional relay (Rel.), which causes the relay to energize and turns on the LightBar.

1 = LightBar circuit combined with high beam
0 = High beam only
2 = LightBar only