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the duration of the starter operation yourself. Once the engine has started, the start assistant
is deactivated. For example, you cannot restart the engine with the start assistant until the
ignition has been switched off and on again once. The start assistant is intended, for example,
for show vehicles or gatherings on closed private grounds. Connecting and using this function
is at your own risk.
Battery protection circuit / deep discharge protection
The alarm system is deactivated when deep discharge of the battery is imminent.
Depending on the battery capacity, condition and ambient temperature, this usually only
occurs after several weeks, as the power consumption of the CR4 is very low. Even at rest,
some current still flows (a few milliamperes). It is recommended, as usual, to connect a trickle
charger for winter storage or during long periods of standstill.
How to find out if the start button is positive-switching or negative-switching:
The first goal is to locate the cable leading from the start button to the starter relay. Get access
to the starter relay. Two thick cables exit there, which must stay untouched. Disconnect all
other cable connections from the starter relay (usually two individual cable lugs or a com-
pact plug). Switch on the ignition and measure, e.g., with a test lamp, for each contact in the
connectors once against the negative pole and once against the positive pole of the bat-
tery, whether the voltage changes from zero volts to battery voltage when the start button
is pressed. There is usually only one contact for which this is the case. If the voltage changes
when measuring against battery negative, the start button is positive-switching. If it chang-
es against battery positive during measurement, it is negative-switching. Negative-switching
starter relays usually have only 2 contacts. A new permanent negative cable must be connect-
ed to the negative-switching contact and the green cable of the CR4 must be connected to
the other. In future, the CR4 will switch the positive wire of the starter relay.
Function and connection of the grey-red and grey-white cables:
• Grey-red cable: External, negative-switching alarm switches can be connected to this cable,
e.g., to protect suitcases. Additional negative-switching sensors can also be connected there
(e.g. proximity sensors).
APPENDIX