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A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6667
Experience:  ASE Master Certified, ASE Advanced Gasoline Engine Performance
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2006 Ford Taurus SEL 3.0 brake warning light is on.

Customer Question

2006 Ford Taurus SEL 3.0 brake warning light is on.
Submitted: 1 year ago.
Category: Ford
Expert:  A. Penland replied 1 year ago.

If you unplug the brake fluid level sensor, does the red brake light go out?
If you unplug the parking brake switch, does the red brake light go out?

Customer: replied 1 year ago.
I've done both together and separate with no change.
Expert:  A. Penland replied 1 year ago.

Check the resistance to ground on the light green/yellow striped wire at the fluid level sensor connector and the parking brake switch connector on the light green wire with the key off and the battery disconnected. This will tell us if either wire is shorted to ground. Either the instrument cluster is bad, the dash fuse box, called the smart junction box, is bad or the wiring is shorted to ground.

Customer: replied 1 year ago.
I get 19m ohms on the green wire for the parking brake and 1.3k ohms for the yellow/green wire on the fluid sensor.
Expert:  A. Penland replied 1 year ago.

Ok. We need to unplug two connectors on the dash fuse box and remeasure.

See the diagram below and locate connectors C2280D and C2280F. Unplug them both and remeasure the resistance. Remember to have the battery disconnected.

Customer: replied 1 year ago.
With those connectors unplugged from the dash fuse box, I don't get any readings from the fluid level sensor or the parking brake switch.
Expert:  A. Penland replied 1 year ago.

You get an open circuit reading on the meter or OL?

Customer: replied 1 year ago.
I get 0.L, same as if the meter probes are not touching anything.
Expert:  A. Penland replied 1 year ago.

Ok. The problem is in the dash fuse box, or what Fords calls it, the SJB. Smart Junction Box.

Customer: replied 1 year ago.
OK. What will I need to replace?
Expert:  A. Penland replied 1 year ago.

The SJB will need to be replaced.

Customer: replied 1 year ago.
I have a 2000 TaurusI can use for parts. Will the SJB be the same?
Expert:  A. Penland replied 1 year ago.

No, the 2001 and 2006 are completely different.

Customer: replied 1 year ago.
If I were to pull a SJB from a parts car, what years could I pull one from?
Expert:  A. Penland replied 1 year ago.

2005-2007

Customer: replied 1 year ago.
Do you have the manufacture part number for this part?
Expert:  A. Penland replied 1 year ago.

Can you give me the VIN#>

Customer: replied 1 year ago.
1FAFP56U36A120123
Expert:  A. Penland replied 1 year ago.

It looks like it should be 5F1Z-15604-C by your VIN#.

Customer: replied 1 year ago.
I saw some that same they come with remotes. Will I need to replace/reprogram my remotes or can I transfer over a part from the old SJB to the new one?
Expert:  A. Penland replied 1 year ago.

You can reprogram your remotes to the new one.

Customer: replied 1 year ago.
I replaced the SJB and I still have the same problem. I noticed that C2280D had only 3 wires and it looked like the same wires that go the the low brake fluid sensor. Is this end route for the sensor wires?
Expert:  A. Penland replied 1 year ago.

Below is the connector view of C2280D.

Customer: replied 1 year ago.
OK, so that connector isn't what I had hoped. I'll need more diagnostic steps to continue troubleshooting this problem.
Expert:  A. Penland replied 1 year ago.

See below.

Customer: replied 1 year ago.
Is circuit 547 (LG/YE) Brake indicator, control for the parking brake or the brake fluid level sensor?
Customer: replied 1 year ago.
It doesn't matter. I went a head and tested the system without that connector plugged in and the situation is the same.
Expert:  A. Penland replied 1 year ago.

547 is for the brake fluid level sensor.

Customer: replied 1 year ago.
What do I do now?
Expert:  A. Penland replied 1 year ago.

When you tested this earlier, did you have the battery disconnected? This is a copy of out earlier relies to each other on Jun 26, 2016.

Check the resistance to ground on the light green/yellow striped wire at the fluid level sensor connector and the parking brake switch connector on the light green wire with the key off and the battery disconnected. This will tell us if either wire is shorted to ground. Either the instrument cluster is bad, the dash fuse box, called the smart junction box, is bad or the wiring is shorted to ground.

26 Jun 2016, 9:16 PM

Customer

I get 19m ohms on the green wire for the parking brake and 1.3k ohms for the yellow/green wire on the fluid sensor.

Customer: replied 1 year ago.
Expert:  A. Penland replied 1 year ago.

We will need to get access to a scan tool that can communicate with the instrument cluster and the Smart junction box (dash fuse box) and monitor pids to see what is causing it. See steps K1-K3 of the pin point test.

Customer: replied 1 year ago.
I don't have one of those.
Expert:  A. Penland replied 1 year ago.

Only dealerships and good independent repair shops do.