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Steve
Steve, Honda Mechanic
Category: Honda
Satisfied Customers: 3431
Experience:  13+ years with Honda,ase certified over 25 years
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I have a 2005 Honda Accord 4-cylinder. At night my

Customer Question

I have a 2005 Honda Accord 4-cylinder. At night my headlights get dim when I take my foot off the accelerator or slow down. What’s wrong with it?
Submitted: 1 year ago.
Category: Honda
Expert:  Steve replied 1 year ago.

Some of this may be normal if there are no stored codes. A stored fault code of P1298 would indicate a faulty Electronic Load Detector. This will not cause a check engine light.

Here is an explanation on what may be going on:

Since the early ’90s, Honda vehicles have come with
an electrical load detector (ELD) unit in the
under-hood fuse/relay box. This unit allows the
ECM/PCM to regulate the alternator (switch it
between high output and low output) to provide the
best combination of fuel economy and electrical
system operation. The ELD sends a signal to the
ECM/PCM that’s proportional to the electrical
demand. The ECM/PCM switches the alternator
between high output and low output depending on
several factors, which include electrical demand,
battery charge level, and the driving cycle. When the
alternator is in low output, the engine load is reduced
and fuel economy improves.

Customer: replied 1 year ago.
Well it doesn't seem normal and there is no error message on the dash. The lights are too dim for night driving when this happens. I had to replace the battery a couple of weeks ago because the (old) one discharged prematurely.
Expert:  Steve replied 1 year ago.

You will not see an error message for P1298 which is the ELD. This part is inside the fuse box under the hood and is replaceable separate of the complete fuse box. You would need to have the computer system scanned for codes to see if this code is set.