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Electrical 3rd Gen Dodge Ram Electrical Problems and Questions.


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Old 10-16-2010, 09:26 AM
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Default over head console

My over head console works fine but the outside temp dosen't work it just reads -54. Tryed changing the senser that did not work must have a power problem. Any way to check it.
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Old 10-17-2010, 01:41 AM
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Here is an excerpt from the 04 manual -

Quote:
AMBIENT TEMP SENSOR
DESCRIPTION
Ambient air temperature is monitored by the overhead
console. The ambient temperature messages are
received from the Front Control Module (FCM) over
the Programmable Communications Interface (PCI)
J1850 data bus circuit. The FCM receives a hard
wired input from the ambient temperature sensor
(Fig. 7). The ambient temperature sensor is a variable
resistor mounted to the underside of the hood,
in the engine compartment.
For more information on the front control module,
refer to Front Control Module in the Electronic
Control Modules section of this manual. For complete
circuit diagrams, refer to Wiring. The ambient temperature
sensor cannot be adjusted or repaired and,
if faulty or damaged, it must be replaced.
OPERATION
The ambient temperature sensor is a variable
resistor that operates on a five-volt reference signal
sent to it by the Front Control Module. The resistance
in the sensor changes as temperature changes,
changing the temperature sensor signal circuit voltage
to the Front Control Module. Based upon the
resistance in the sensor, the Front Control Module
senses a specific voltage on the temperature sensor
signal circuit, which it is programmed to correspond
to a specific temperature. The Front Control Module
then sends the proper ambient temperature messages
to the EVIC, CMTC over the PCI J1850 data
bus.
The temperature function is supported by the
ambient temperature sensor, a wiring circuit, the
Front Control Module, the Programmable Communications
Interface (PCI) data bus, and a portion of the
Electronics module. If any portion of the ambient
temperature sensor circuit fails, the Front Control
Module will self-diagnose the circuit.
For complete circuit diagrams, refer to Wiring.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - AMBIENT
TEMPERATURE SENSOR
(1) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Disconnect the ambient temperature sensor wire harness
connector.
(2) Measure the resistance of the ambient temperature
sensor. At 24 C (75 F), the sensor resistance
should be approximately 10.3 kilohms. At 30 C (86
F), the sensor resistance should be approximately
7.57 kilohms. The sensor resistance should decrease
as the temperature rises. If OK, refer to Diagnosis
and Testing - Ambient Temperature Sensor Circuit
in this group. If not OK, replace the faulty
ambient temperature sensor.
NOTE: The ambient temperature sensor is a very
sensitive device. When testing, be certain the temperature
sensor has had time to stabilize (room
temperature) before attempting to read the sensor
resistance. Failure to let the ambient temperature
sensor temperature stabilize could result in a misleading
test.
DIAGNOSIS AND TESTING - AMBIENT
TEMPERATURE SENSOR CIRCUIT
(1) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Disconnect the ambient temperature sensor wire harness
connector and the Front Control Module wire
harness connector.
(2) Connect a jumper wire between the two terminals
of the ambient temperature sensor wire harness
connector.
(3) Check for continuity between the sensor return
circuit and the ambient temperature sensor signal
circuit cavities of the Front Control Module wire har-
Fig. 7 Ambient Temperature Sensor - Typical
8M - 10 MESSAGE SYSTEMS DR
ELECTRONIC VEHICLE INFO CENTER (Continued)
ness connector. There should be continuity. If OK, go
to Step 4. If not OK, repair the open sensor return or
signal circuit as required.
(4) Remove the jumper wire from the ambient temperature
sensor wire harness connector. Check for
continuity between the sensor return circuit cavity of
the Front Control Module wire harness connector
and a good ground. There should be no continuity. If
OK, go to Step 5. If not OK, repair the shorted sensor
return circuit as required.
(5) Check for continuity between the ambient temperature
sensor signal circuit cavity of the Front
Control Module wire harness connector and a good
ground. There should be no continuity. If OK, refer to
Diagnosis and Testing - Overhead Console in
this group. If not OK, repair the shorted ambient
temperature sensor signal circuit as required.
REMOVAL
(1) Open the hood.
(2) Disconnect and isolate the battery negative
cable.
(3) Working on the underside of the hood, remove
screw holding sensor to hood panel.
(4) Disconnect the sensor electrical connector and
remove sensor from vehicle.
INSTALLATION
(1) Connect the sensor electrical connector.
(2) Working on the underside of the hood, install
screw holding sensor to hood panel.
(3) Connect the battery negative cable.
(4) Close the hood.
Hope this helps.
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