Parking brake light
Thread Starter
|
Mountain Pass
Joined: Mar 2002
Posts: 190
Likes: 0
Parking brake light
2005 F150 XLT 4.6L 4X2
The parking brake lamp stays on all the time. The dealership has replaced the relevant sensors and says the wiring harness is the culprit.
I'm wondering if one of the connectors in the harness is failing, and if I can jumper around the faulty connector.
Does anyone have an experience with this problem?
The parking brake lamp stays on all the time. The dealership has replaced the relevant sensors and says the wiring harness is the culprit.
I'm wondering if one of the connectors in the harness is failing, and if I can jumper around the faulty connector.
Does anyone have an experience with this problem?
Mountain Pass
Joined: May 2023
Posts: 109
Likes: 23
From: Summerville SC
Not with this exact problem but with similar electrical problems. If you have a voltmeter and are willing to do some troubleshooting, you can probably find the cause, but it might take a while.
Thread Starter
|
Mountain Pass
Joined: Mar 2002
Posts: 190
Likes: 0
I'm thinking out loud trying to get a handle on what's happening in the circuit. If I goof any of these thoughts let me know.
During proper operation, when the parking brake pedal is pressed, it moves a switch which opens and allows a current to flow through the wiring harness and then to (I'm guessing) some module or the ECM/PCM or directly to the indicator light.
Since the circuit is malfunctioning and the indicator light is on constantly, then either
(a) the switch is sticking open
(b) there is a short to power in the circuit after the switch
(c) there is an internal short in the circuit allowing power to bypass/jump the switch
(d) ????? [please fill in other possibilities]
Am I anywhere close to saying this correctly?
During proper operation, when the parking brake pedal is pressed, it moves a switch which opens and allows a current to flow through the wiring harness and then to (I'm guessing) some module or the ECM/PCM or directly to the indicator light.
Since the circuit is malfunctioning and the indicator light is on constantly, then either
(a) the switch is sticking open
(b) there is a short to power in the circuit after the switch
(c) there is an internal short in the circuit allowing power to bypass/jump the switch
(d) ????? [please fill in other possibilities]
Am I anywhere close to saying this correctly?
Thread Starter
|
Mountain Pass
Joined: Mar 2002
Posts: 190
Likes: 0
Looking at the wiring diagram in Chilton, it looks like the switch closes to ground the circuit. So if the light stays on the circuit is constantly grounded. So is the only possible fault a short to ground after the indicator light? Or a short within the instrument cluster connector?
Thread Starter
|
Mountain Pass
Joined: Mar 2002
Posts: 190
Likes: 0
Trending Topics
5th Wheeling
Joined: Nov 2023
Posts: 37
Likes: 17
From: South East TN
that light is triggered for more than the E brake its also a indicator of low brake fluid and could be low fluid or bad fluid level switch in the master cylinder reservoir
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Cross-Country
Joined: Jul 2022
Posts: 70
Likes: 14
From: North Carolina
2005 F150 XLT 4.6L 4X2
The parking brake lamp stays on all the time. The dealership has replaced the relevant sensors and says the wiring harness is the culprit.
I'm wondering if one of the connectors in the harness is failing, and if I can jumper around the faulty connector.
Does anyone have an experience with this problem?
The parking brake lamp stays on all the time. The dealership has replaced the relevant sensors and says the wiring harness is the culprit.
I'm wondering if one of the connectors in the harness is failing, and if I can jumper around the faulty connector.
Does anyone have an experience with this problem?
Cross-Country
Joined: Jul 2022
Posts: 70
Likes: 14
From: North Carolina
Brake light won
Rubber bumper on back of E brake pedal. Note hole in the middle.
Switch showing pin that disconnects wire from being grounded to frame when brake released/off.
Switch with wire disconnected.
Hardened glue filling hole on top of rubber bumper.
Thread Starter
|
Mountain Pass
Joined: Mar 2002
Posts: 190
Likes: 0
I pulled the instrument cluster cover tonight and wiggled the connector and the light went off. I've got the cluster out and apart and will get some solder to hopefully complete the repair tomorrow.
From when the dealership had worked on it previously there was a water bottle cap still stuck in front of the connector to try to stabilize the connection and keep the light off. 🙂
From when the dealership had worked on it previously there was a water bottle cap still stuck in front of the connector to try to stabilize the connection and keep the light off. 🙂
Cross-Country
Joined: Jul 2022
Posts: 70
Likes: 14
From: North Carolina
Yes, I don't have the problem with the brake light staying on or randomly comming on while driving. You can see how the end of the pin caused a recess in the rubber bumper on top of the hole in the middle of the bumper. You could do any number of things to fix it. Glue, a small plastic or metal patch glued on top.