1993 Nissan 240SX digital Speedometer/dash not lighting up

Hi juanfariasc,

Thank you for the donation.

Being an intermittent problem, the most likely cause would be a loose wire connection or a bad soldered joint of the printed circuit board.

Source should be from the meter cluster and you would have to remove it to check wire connectors, holding screws and solders.

The data available to me are only for analog meter clusters so I am not able to provide much information for the meter clusters.

You would have to remove the meter cluster to test the lighting circuits. Ic ouldd be due to a bad connector or power from the lighting system is not getting the meter cluster.
Another possibility would be the ground circuit for the meter cluster is faulty.

If the clock lights do not function when speedometer and meter back lights are working, then it could be a separate problem, the bulb could be blown.

Sorry for the drelay in replying. I have been encountering difficulties logging into my database for the past few days and is still facing it.

However it must be noted that the speedometer not working could be due to the Power Control Module (PCM) but the back lights are a different problem as they are not controlled by the PCM.

There are 2 separate schematics and one of it has the control unit in the meter cluster. For both, youneed to test oif the speed sensor is pulsing to provide the signal.

Thank you for the input.

It is much appreciated.

There are so many possiblilties for malfunctions and such repairs are not in the book as the manufacturer does not provide repairs procedures for components and recommendations are to replace the meter assy if it is the cause.

When capacitors goes bad, it usually provides some visual clues. Look out for chemical leaks which would show as some oily stuff and it might cause some corrocsion/oxidation of the contacts around it.

From the link, the explanation is very good. Since you are at it, you should look at other capacitors as well. They tend to go bad over the years.