The LED flashes, but the lights won't come on. Do I need to install a light shield. The sensor is mounted in a well shaded area 10 to 12 feet above ground. There are landscape lights beneath the sensor are 7 watt. The unit was working Okay until I had to turn off the wired controll switch because the lights were coming on during the day while I was working in its path. Gary

That is a fascinating statement...
Is there something in particular you need help with?

the remote uses light to send a signal to the tv. make sure there isn't anything interfering with the light signal. it could be dirty or the receiver could have dirt obstructing the light.

you have to open the back cover to check weather the screen back light need replacement. usually if the lamp is almost black in color it needs replacement. the backlight is covered with metal shield installed at the upper portion and lower portion of the panel of the tv.

Both sensors will have their green led lights lit (on) when aligned. When not aligned only one sensor will be lit.

Make sure both sensors' lens are clean.

If still not aligned loosen the lit sensor from its mounting bracket using the proper tool, but most LiftMasters have a wing nut mounting for the sensors.

Aim the free sensor in the direction of the unlit one and look for its led to light. If necessary, using a screw driver remove the staples securing the sensor wiring enough to physically place the sensors eye ball to eye ball looking for the unlit sensor to light. If the unlit sensor still won't light then there is a broken or pinched wires some where between the unlit sensor and the garage door opener.

This is most likely the rear wheel speed sensor, which is located on top of the differential housing.
Mopar part number is 05032220AA and is $18 Online at http://dodgeparts.mopar.com
(A graphic illustration can be found there too.)
I experienced the exact same problems on my 99 Dakota, and a new sensor fixed all the symptoms.
First I tried an aftermarket sensor from one of the chains, but it just did not fit right. Ended up buying one from Dodge, which popped right in. Take note on how the old sensor is situated before removal. Be careful when you remove the old sensor, slowly pry/wiggle it out. Take your time, you do not want it to brake and have debris fall into your differential. When you install the new one, lube the O-ring with Diff. fluid to ease it in.

From Dodge service manual:
Removal:
(1) Raise vehicle on hoist
(2) Remove brake line mounting nut and remove the brake line from sensor stud
(3) Remove mounting stud from sensor and shield
(4) Remove sensor and shield from differential housing.
(5) Disconnect sensor wire harness and remove sensor

Installation:
(1) Connect harness to sensor. Be sure seal is securely in place between sensor and wiring connector.
(2) Install O-ring on sensor (if removed)
(3) Insert sensor in differential housing
(4) Install sensor shield
(5) Install the sensor mounting stud and tighten to 24 N-m (200 in. lbs.)
(6) Install brake line on sensor stud and install nut
(7) Lower vehicle


I am no mechanic by any means, but it took me about 15 minutes to fix.
Good luck

See above.

Error Indication Information
Error No. Error Information ERROR DESCRIPTION LAMP LED OSD LAMP OFF
(Note 3) (Note 4)
POWER LED TEMP LED
Note:
1.When any of the above errors has occurred, the LED will flash as shown above every 5 seconds.
2.When two or more errors have occurred at the same time, the LED will light up or flash as shown above, and then
change to another every 5 seconds in turn.
3.Warning OSD appears when the Air Filter is clogged 90%, accumulated operation time of the Lamp reaches 5000 hours,
or accumulated operation time of the Air Filter reaches 400 hours.
4.LAMP OFF: The LED will flash right after the Lamp goes off.
5.IC2301 is mounted on LCD Main C.B.A. which is included in the Projection Unit.
6.IC6001 is mounted on TV Main C.B.A.
Clogged air filter
more than 90%
15)
16)
17)
18)
1)
2)
3)
4)
5)
6)
7)
11)
8)
9)
10)
12)
13)
14)
- flashes 5 times -
every 5 seconds
IC2301(pin82) detects the clogged air filter, then indicates the
error when the air filter is clogged 90%.
Front Fan stop or
Lamp Fan stop
flashes orange
once every
5 seconds
- -
IC2301(pin12) detects the Front FAN stop or Lamp
FAN stop, then indicates the error when the Front FAN
or Lamp FAN is stopped.
Lamp Cover open
Temperature Sensor
short or open
flashes orange
twice every
5 seconds
flashes orange
3 times every
5 seconds
flashes green for
140 seconds.
flashing red for
60 seconds.
light up red.
flashes once
every 5 seconds
flashes once
every 5 seconds
flashes red for
10 minutes
flashes once
every 5 seconds
-
-
-
-
Abnormal
Temperature
flashes twice
every 5 seconds
flashes twice
every 5 seconds
- -
Request for Lamp
Replacement - - lights up
Power Ballast Error
(abnormal
Lamp voltage)
- -
flashes 3 times
every 5 seconds
Power Ballast Error
(abnormal
temperature)
- -
flashes 4 times
every 5 seconds
Power Ballast Error
(other causes) - -
- -
Request for Filter
Cleaning -
Abnormal Voltage
on 16 V line of
LCD Main C.B.A.
-
flashes twice
every 5 seconds
flashes twice
every 5 seconds
Abnormal Voltage
on 14 V line of
LCD Main C.B.A.
-
flashes 3 times
every 5 seconds
flashes 3 times
every 5 seconds
Abnormal Voltage
on 7 V line of
LCD Main C.B.A.
-
flashes 4 times
every 5 seconds
flashes 4 times
every 5 seconds
IC2301(pin76) detects the Lamp Cover Unit condition
(open or close), then indicates the error when the
Lamp Cover Unit is open.
IC6001(pin85) detects the Duct FAN stop, then
indicates the error when the Duct FAN is stopped.
IC2301(pin74 and 75) detects open or short of the Temperature
Sensor (R2911) on Front Thermistor C.B.A., then indicates the
error when Temperature Sensor is open or shorted.
(The error is not detected for 1 minute after Lamp ON.)
IC2301(pin74 and 75) detects the temperature attached near
the Front FAN by the Temperature Sensor (R2911) on Front
Thermistor C.B.A., then indicates the error when the
temperature becomes more than 43 C (109 F).
(The error is not detected for 1 minute after Lamp ON.)
IC6001(pin86 and 87) detects open or short of the
Temperature Sensor (R2901) on Lamp Thermistor C.B.A.,
then indicates the error when Temperature Sensor is open or
shorted.
(The error is not detected for 4 minutes after Lamp ON.)
IC2301(pin74 and 75) detects the temperature attached near
the Lamp by the Temperature Sensor (R2901) on Lamp
Thermistor C.B.A., then indicates the error when the
temperature becomes more than 60 C (140 F).
(The error is not detected for 4 minutes after Lamp ON.)
IC2301(pin11) detects the error of LCD Power C.B.A.,
then indicates the error when the temperature fuse
(117 C)(243 F) in LCD Power C.B.A. is open.
IC2301(pin11) detects the error of LCD Power C.B.A. and Lamp,
then indicates the error when an inner malfunction of LCD Power
C.B.A. occurs, the Lamp voltage becomes more than 130V or
less than 30V, Lamp current becomes more than 5A, or the Lamp
is cracked.
IC2301(pin11) detects the error of the Lamp, then indicates the
error when the Lamp is short-circuit.
IC2301(pin48) detects +16V line voltage on LCD Main
C.B.A., then indicates the error when the voltage
becomes less than +13V.
IC2301(pin47) detects +14V line voltage on LCD Main
C.B.A., then indicates the error when the voltage
becomes less than +11V.
IC2301(pin45) detects +7V line voltage on LCD Main
C.B.A., then indicates the error when the voltage
becomes less than +5.7V.
IC2301(pin44) detects +3.3V line voltage on LCD Main
C.B.A., then indicates the error when the voltage
becomes less than +2.5V.
flashes 3 times
every 5 seconds
flashes 4 times
every 5 seconds
Abnormal Voltage
on 3.3 V line of
LCD Main C.B.A.
-
-
-
- flashes 5 times
every 5 seconds
Forced cooling
The failure of Lamp
light up
-
Temperature Sensor
short or open
-
-
Abnormal
Temperature
Duct Fan stop -
When accumulated operation time of the the Lamp reaches
5000 hours, OSD (replacing the Lamp) appears on the screen.
Note: The Lamp time is stored in EEPROM (IC2305).
When accumulated operation time of the Air Filter reaches 400
hours, OSD (cleaning the Air Filter) appears on the screen.
Note: The Filter time is stored in EEPROM (IC2305).
During forced cooling, this indication is indicated.
IC2301 (pin11) detects the failure of light up processing of
the Lamp, then the POWER LED is changed as follows.
1) POWER LED flashes green for 140 seconds (while turning on).
2) POWER LED flashes red for 60 seconds (while cooling).
3) POWER LED lights up red (standby).
Note: If the Lamp will not light after attempting turning on the
power 2 or 3 times, the Lamp, the LCD Power C.B.A. or the
LCD Main C.B.A. may be defective.
Error Symptom Problem Possible Solutio

There's one located directly after your catalytic converter and the other one is located before your catalytic converter (somewhere between your headers and that cat)

The Vehicle Speed sensor is located on top of the differential housing. it is held in with one bolt and takes about 15 minutes to change. Part #56028 187AC. Always have the dealership check and verify for the latest updated part number. REMOVAL: Raise vehicle on hoist. Remove brake line mounting nut and remove the brake line from the sensor stud. Remove mounting stud from the sensor and shield Rear Speed Sensor Mounting . Remove sensor and shield from differential housing. INSTALLATION: Connect harness to sensor. Be sure seal is securely in place between sensor and wiring connector. Install O-ring on sensor (if removed) Insert sensor in differential housing. Install sensor shield. Install the sensor mounting stud and tighten to 24 N·m (18 ft. lbs.).
Install the brake line on the sensor stud and install the nut.
Lower vehicle. ,I hope this helps you?

You either have a bad fan or one of the rotation sensors mounted on one of the fans has failed. Take the back off the set and see it the main fan slightly right of center is rotating. If it is, there are two more fans, one mounted right above the lamp and another on the optical block itself. You will have to pull the optical block to check those.