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5.15 AUTOMATIC DOOR LOCK
The locking function is performed by means of a locking
piston that is moved in either direction by a small electri-
cal motor with an integrated gearbox. The piston has slots
so that locking pins on the doors may move in and out
when the lock is de-activated, but are hooked up when the
lock is activated. The pins on the doors are spring actu-
ated to permit closing of a door after the lock is activated.
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It locks the doors when the engine is started and un-
locks again when the engine is stopped.
It is possible to override the lock manually so that the
doors may be opened even if the engine is running.
After such a manual unlocking, the lock is activated
again after a short delay.
The lock is controlled from the D+ voltage from the al-
ternator on the vehicle’s engine. This voltage is typi-
cally +14 V DC when the engine is running and 0 V
DC when stopped.
If the lock is actuated when a door is open, the me-
chanical design of the lock still permits the door to be
closed and it will then be locked after closing.
The electronic unit is a part of the lock assembly. It oper-
ates on the vehicle’s +12 V DC and the D+ voltage from
the alternator. The lock is activated when D+ goes high
and de-activated when D+ goes low. The motor current
is monitored to check when the lock piston has reached
the end positions and motor is stalling. There is also a
limitation of the time that the motor voltage is allowed to
be on. In addition, an optical sensor is used to check if the
lock piston is fully at the locked position. This information
is used to re-lock the doors after a short delay if the lock
is deactivated manually when the vehicle’s engine is run-
ning. This function is also used to detect a failed locking.
New locking attempts will then be made.
Three wires to the automatic door lock.
1. Black Chassis Ground
2. White from D+ terminal (signal to lock doors)
3. Red from J3 lower control board (refrigerator on)
5.16 DC Relay
The relay controls the circuits to the Ventilator fans, Ice-
maker water line heater and 12 volt water valve. The load
Power out to DC
components
12 volt DC from
control board
Chassis
Ground
12 volt DC in from
ma in t er mi na l
block
Terminal 86 12 volt DC in from control board J3 (coil)
Terminal 85 Chassis ground.
Terminal 30 12 volt DC in from terminal block (supply)
Terminal 87 12 volt DC out to components
If you have DC voltage to terminals 86 (positive from con-
trol board) and good ground on terminal 85, but no conti-
nuity between 30 & 87 the relay will need to be changed.
Refer to wiring diagram on the back of the product or
check parts list for proper diagram. To acquire the proper
wiring diagram always use the product number.
SECTION 6 WIRING
Check all wires, harnesses and the connectors to ensure
a proper and tight connection. Harness between upper
and lower control boards. Also verify the refrigerator is
wired per the wiring diagram for the model you are work-
ing on. (See applicable wiring diagrams for your model
refrigerator) A loose connection can create erratic opera-
tion. Always check the wires at the DC terminal block, two
(2) wires in and two (2) wires out.
6.1 Internal Wiring
5.17 Ventilator Fans
The RM1350 use two ventilator fans mounted to the back
of the refrigerator (exterior). The purpose is to assist re-
quired air movement across the refrigerator condenser
to ensure optimum performance. The fans are powered
from DC current and are controlled from a limit switch,
mounted on the end plate to the condenser ns just above
the ue. The limit switch is normally open and will close at
149° F +/- 9° F and re-open at 122° F +/- 9° F. The switch
can be checked for continuity. If the fans fail to run, check
all wiring, the inline 3 amp fuse and the limit switch. If
these checks are good, replace the fan(s).
(amps) of the components is handled through the relay.
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