Lower Control Module - Dometic DM2652 Service Manual

Americana and New Generation Refrigerators
Component
EN
Diagnostic Question

Lower Control Module

Is the refrigerator not operating and the
interior light not on? (Americana models
only)
Is the check indicator lamp on?
(Americana models only)
Is the refrigerator not operating and the
interior light not on? (New Generation
models only)
Is the refrigerator not operating but the
interior light is on?
Does the refrigerator operate in electric
mode but not in gas mode?
Does the refrigerator operate in gas
mode but not in electric mode?
Is E3 displayed? (New Generation
models only)
Are two temperature setting lights
blinking? (First generation DMR702 and
DMR702-D models only)
Action Based On Status
1. Confirm that the voltage supplied to the
lower control module at J4 is between
10.5–13.5 VDC.
2. If the voltage is out of specification,
perform a diagnostic on the power supply.
1. If the module is equipped with a 3 A
12 VDC fuse, test the fuse for continuity.
2. If the fuse is blown, replace it.
1. Confirm that the voltage between the
red (negative) and orange (positive)
wires connected at P1 is between 10.5–
13.5 VDC.
2. If the voltage is out of specification,
replace the lower control module.
1. Confirm that the voltage supplied to the
lower control module at J4 is between
10.5–13.5 VDC.
2. If the voltage is out of specification,
perform a diagnostic on the power
supply.
1. Confirm that the voltage supplied to the
lower control module at terminal 6 is
between 10.5–18 VDC.
2. If the voltage is out of specification,
perform a diagnosis on the power supply.
1. Test the 3 A 12 VDC fuse for continuity.
2. If the fuse is blown, replace it.
1. Confirm that the voltage from terminal 2 is
between 10.5–13.5 VDC.
2. If the voltage is out of specification,
replace the lower control module.
Perform a diagnostic on the lower control
module to rule out any issues with power flow
through the component.
Perform a diagnostic on the communication
wire harness.
Perform a diagnostic for RF interference.
1. Test the 5 A 120 VAC fuse for continuity.
2. If the fuse is blown, replace it.
If the problem persists, replace the lower
control module.
1. Confirm that the voltage on the yellow
wire to J1, terminal 3 is between 10.5–
18 VDC.
2. If the voltage is out of specification,
perform a diagnosis on the power supply.
If the error persists, replace the lower control
module.
Diagnostic Procedures
Page
15
33
15
33
15
15
33
15
33
21
16
29
33
15
48
21