Testing The Communication Wire Harness For Continuity; Replacing The Communication Harness - Dometic DM2652 Service Manual

Service Procedures
6. Disconnect all wiring from the lower control module,
gas valve, thermo fuse, and ventilator fan/switch (if
installed).
7. Refer to "Replacing the Burner Assembly" on page
30 "Replacing the Gas Valve" on page 38 and
"Replacing the Lower Control Module" on page
33 for steps to separate the lower control module,
gas valve, and burner assembly from the cooling unit.
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7 Removing the Defective Cooling Unit
Cooling Unit
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8. Pry out the defective cooling unit. Some careful force
may be required.
9. Clean and prepare inside the cavity space for the new
cooling unit. A bead of thermal mastic is required to
help the heat transfer process.
10. Apply a thick bead of thermal mastic to the following:
– The cavity-facing side of the new cooling coils.
– Each inner corner of the recessed cavity from
bottom to top.
– Around the middle of the inner walls of the cavity.
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Screws
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Americana and New Generation Refrigerators
11. Perform these steps in reverse with the new cooling
unit to complete the replacement.
8.7 Testing the Communication Wire
Harness for Continuity
1. Perform the steps in "Replacing the Communication
Harness" on page 32 to disconnect the
communication wire harness from the upper and
lower control modules.
2. Attach the leads of the multi-meter, one to each end
of a harness wire.
The reading should show continuity. If it shows no
continuity, it indicates a break in the wire.
3. Leave one lead of the multi-meter attached to
the harness wire and touch the other lead first to
the chassis ground and then to the case of the
refrigerator.
The reading should show no continuity. If it shows
continuity, it indicates a short to ground.
4. Repeat steps 2–3 for the remaining harness wires.
I Consult the operating manual for the multi-meter
for specific device function.
8.8 Replacing the Communication
Harness
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8 Removing the Communication Harness
Communication Harness
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1. Disconnect the unit from all power sources (120 VAC
and 12 VDC).
2. Disconnect the communication wire harness from the
lower control module.
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Control Module
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EN