4X4 indicators flashing?

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.

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 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.

Images (Click to make bigger)