4X4 indicators flashing?

Tiny
JASON HOLCOMB
  • MEMBER
  • 2003 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 199,609 MILES
Last year I bought the vehicle listed above XLT model, first one, and added a leveling kit and 35" rims and tires. A couple months ago the 4lo and 4hi lights started flashing in a steady sequence. Fash 3 times a few seconds apart 3 times in a row then pause for a bit then repeats the whole time it's running. I tried putting it in 4hi, lo and A4WD but does not indulge at all. Any suggestions would be appreciated.
Sunday, April 30th, 2023 AT 5:47 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,101 POSTS
Hi,

Does the transfer case respond in any way when you select the different modes of operation? If not, what I'm starting to see is a wiring splice that is failing and preventing power to the 4wd module.

I attached general diagnostics below in pics 1 and 2. Also, pic 3 is the central junction box. I highlighted three fuses in the box that need to be checked. Each fuse is relevant for 4wd operation.

When you check the fuses, also make sure power is present to and from the fuse.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know what you find.

Take care,

Joe

See pics below.

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Sunday, April 30th, 2023 AT 7:58 PM
Tiny
JASON HOLCOMB
  • MEMBER
  • 2 POSTS
Thank you for your response. I'll get on this in the next couple days and let you know what happens.
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Sunday, April 30th, 2023 AT 11:36 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,101 POSTS
Hi,

You are very welcome. When you have a chance, let me know what you find.

Take care,

Joe
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Monday, May 1st, 2023 AT 7:29 PM

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