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A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6293
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: 6 months ago.
Category: Ford
Expert:  A. Penland replied 6 months 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 6 months ago.
I've done both together and separate with no change.
Expert:  A. Penland replied 6 months 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 6 months 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 6 months 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 6 months 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 6 months ago.

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

Customer: replied 6 months ago.
I get 0.L, same as if the meter probes are not touching anything.
Expert:  A. Penland replied 6 months ago.

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

Customer: replied 6 months ago.
OK. What will I need to replace?
Expert:  A. Penland replied 6 months ago.

The SJB will need to be replaced.

Customer: replied 6 months ago.
I have a 2000 TaurusI can use for parts. Will the SJB be the same?
Expert:  A. Penland replied 6 months ago.

No, the 2001 and 2006 are completely different.

Customer: replied 6 months ago.
If I were to pull a SJB from a parts car, what years could I pull one from?
Expert:  A. Penland replied 6 months ago.

2005-2007

Customer: replied 6 months ago.
Do you have the manufacture part number for this part?
Expert:  A. Penland replied 6 months ago.

Can you give me the VIN#>

Customer: replied 6 months ago.
1FAFP56U36A120123
Expert:  A. Penland replied 6 months ago.

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

Customer: replied 6 months 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 6 months ago.

You can reprogram your remotes to the new one.

Customer: replied 6 months 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 6 months ago.

Below is the connector view of C2280D.

Customer: replied 6 months 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 6 months ago.

See below.

Customer: replied 6 months ago.
Is circuit 547 (LG/YE) Brake indicator, control for the parking brake or the brake fluid level sensor?
Customer: replied 6 months 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 6 months ago.

547 is for the brake fluid level sensor.

Customer: replied 6 months ago.
What do I do now?
Expert:  A. Penland replied 6 months 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 6 months ago.
Expert:  A. Penland replied 6 months 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 6 months ago.
I don't have one of those.
Expert:  A. Penland replied 6 months ago.

Only dealerships and good independent repair shops do.

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