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18 No Car Communication
System cannot communicate with car units. Check se-
rial communication states of the main board and the
car controller. If BE or LE leds on CAN drivers are ON
then there is something wrong either in electrical wir-
ing of CAN units or in values of the termination resistors.
Check also parameter [A18]. It defines the CAN-channel
used for car circuit. You should connect car communi-
cation cables to the CAN-port denoted in [A18].
Cause
Troubleshooting
1. Check the connections From CH0-CL0 main PCB to CH-CL of
the ALPK or ALSK board and SCB car top controller board.
2. Remove the above boards one by one and check for any burns
to the back side of them.
3. Disconnect the floor LOPs from panel (they are connected to
the CH1-CL1 channel of the main PCB) they can aect the can
bus system of the main board.
TIP: Check electrical drawings pages 3-4-10
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