Test Of Seat Switch - Husqvarna 967187001 Workshop Manual

CST Autotest

11.2.2 Test of Seat Switch

The switch that detects occupancy of the seat is
Seat switch
also supplied with +5 V on one side. The other
side leads +5 V to CCU D2 via a green lead if the
driver sits on the seat.
+5V
If measuring the green lead at the seat switch
and there is +5 V when the switch is activated but
does not have a signal on CCU D2, there is prob-
ably a break in the splice coupling between the
cables, so inspect this coupling first.
If a fault is not found on the connector, look for
a break on the green lead in the cable. Start by
checking that there is +5 V on the green lead in
the connector between Cables 1 and 2, and check
the voltage in the connector that goes to Cable
1. If there is no +5 V on the pin for the green lead
in the connector going to Cable 1, the fault is in
Cable 2 or in the transition connector. If there is
a supply through the transition connector but no
signal during the test, connector D2, which is cou-
Connector D at CCU
pled to CCU, must be checked. Try to measure
the pin with the connector mounted by inserting a
thin wire through the rubber grommet on the back
D2: Seat switch
of the connector. Connector D can also be discon-
nected from CCU and the connector from the seat
switch loosened, and then measure the resistance
between the CCU connector D2 and the green
lead in the connector for the seat switch. There
should be good contact between these, so-called
zero ohm.
Connector D at CCU
+5V
108
English –