Dometic CRUISE CONTROL MS880 Handleiding pagina 4

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Troubleshooting

The LED on the electronic module does not light up when you apply the

brake

NOTE

For reasons of safety, the cruise control does not work when there are

problems with the original brake light circuit.

Therefore, check that the brake lights are working properly.

➤ Make sure the LED on the electronic module lights up when you press the

buttons on the control element.

➤ If the LED does not light up, check the power supply and earth connection of the

electronic module.

There should be a voltage of +12 V on the orange cable when the ignition is

switched on.

The green cable should have a good earth connection.

➤ Check the connection of the brown and brown/white cable to the brake light

switch using a voltmeter.

Test the cables with the ignition switched on, because some brake light circuits

are powered via the ignition.

The brown/white cable of the electronic module should be connected to a

brake light switch cable which is connected to either the permanent positive

terminal (terminal 30) or to the ignition (terminal 15).

The brown cable should be connected to the brake light switch cable, which

connects the brake light lamp and the brake light switch. This gives an earth

signal from the brake light lamp supply cable when the brake pedal is not

applied, and a positive signal (+12 V) when the brake pedal is applied.

The LED does not flash when an engine speed signal is received (yellow

cable)

This is how to check whether the cruise control is receiving an incorrect engine

speed signal:

➤ Check the engine speed signal using a voltmeter or an oscilloscope.

➤ Make sure the signal is between 6 V and 250 V and the frequency range is

between 6 Hz and 488 Hz.

➤ Check that the yellow cable is not damaged and is properly connected to the

engine speed signal.

MS880