Seat belt alarm does not turn off

Tiny
NORM DAWSON
  • MEMBER
  • 2003 FORD MUSTANG
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
The seat belt alarm does not go off even when the belt is engaged.
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Saturday, August 17th, 2019 AT 12:13 PM

10 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

It could be a bad switch in the receiver itself or it needs to be reset. Here are the directions for deactivating and reactivating the system. Try this first.

_________________________

2003 Ford Mustang V8-4.6L DOHC VIN R
Belt Minder Deactivating/Reactivating
Vehicle Restraints and Safety Systems Seat Belt Systems Service and Repair Procedures Belt Minder Deactivating/Reactivating
BELT MINDER DEACTIVATING/REACTIVATING
Belt Minder Deactivating/Activating

Preparation
1. Before deactivating/activating the belt minder, set the parking brake.
2. Place the gearshift in P (Park) (automatic transmission) or the neutral position (manual transmission).
3. Place the ignition switch in the OFF position.
4. Close all the vehicle doors.
5. Unbuckle the driver safety belt.
6. Place the parklamps/headlamps switch in the OFF position. (If the vehicle is equipped with Autolamps, this will not affect the procedure.)

Deactivating/Activating
1. Turn the ignition switch to the RUN position. (Do not start the engine.)
2. Wait until the safety belt warning lamp turns off. (Approximately one to two minutes)
3. Buckle then unbuckle the safety belt three times, ending with the safety belt unbuckled. This portion of the procedure can be done before or during belt minder warning activation.

NOTE: Steps 3 through 5 must be completed within 60 seconds or the procedure must be repeated.

4. Turn the parklamps/headlamps on then off.
5. Buckle then unbuckle the safety belt three times ending with the safety belt unbuckled. After this step the safety belt warning lamp will be illuminated for three seconds.
6. Within seven seconds of the safety belt warning lamp turning off, buckle then unbuckle the safety belt. This will enable the belt minder if disabled or disable the belt minder if enabled.
7. The following sequence of events confirm the belt minder is enabled:
flashing of the safety belt warning belt lamp four times per second for three seconds
three seconds with the safety belt lamp off
flashing the safety belt lamp four times per second for three seconds again
8. The safety belt lamp flashing four times per second for three seconds provides confirmation that the belt minder is disabled.
9. After confirmation, the deactivation/activation procedure is complete.

________________________________

Let me know if this helps.

Take care,
Joe
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Saturday, August 17th, 2019 AT 5:56 PM
Tiny
NORM DAWSON
  • MEMBER
Wow, sounds like my wife's Mercedes. Thank you. Will try tomorrow.
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Saturday, August 17th, 2019 AT 7:31 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome back:

Honestly. I miss the old days. LOL Take care and let me know if it helps. Also, make sure nothing is disconnected at the belt.

Joe
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Saturday, August 17th, 2019 AT 8:57 PM
Tiny
NORM DAWSON
  • MEMBER
Hi Joe

I tried it twice and the light and beeper still only goes off after a few miles or minutes.
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Monday, August 19th, 2019 AT 3:21 PM
Tiny
NORM DAWSON
  • MEMBER
I also shorted the two wires on the belt to see if that would work. It did not.
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Monday, August 19th, 2019 AT 3:22 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
What happens if you disconnect the switch in the belt?
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Monday, August 19th, 2019 AT 7:09 PM
Tiny
NORM DAWSON
  • MEMBER
I will check that tomorrow. I think I tried that when I cut the wires. It would then be an open circuit I think but I will check again.
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Monday, August 19th, 2019 AT 7:14 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Let me know what you find.

Joe
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Monday, August 19th, 2019 AT 8:03 PM
Tiny
NORM DAWSON
  • MEMBER
Hi Joe,

The alarm and light goes off after a few seconds and does not go back on even if I do not engage the seat belt. The noise is gone but I wonder about the air bag being engaged?
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Tuesday, August 20th, 2019 AT 9:40 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome back:

The only thing I can think of is the gem module is bad. Gem (generic electric module) is what sends the signal to the buckle switch. They used to be a problem if the windshield had a leak. Water would get to them and cause them to malfunction. If you look at pic 1, I attached a portion of the wiring. I drew an arrow (sad one) that points to the seat switch. The only other thing is the seat belt switch itself. If you look at picture 2, you'll see it is nothing more than a basic switch. When closed, power goes to ground.

I attached a third picture. If you have a good enough scanner, you can check for codes related to the GEM. Take a look at the picture. I cut out two codes for you to see. Also, look to the right for what needs checked.

Based on everything you have done, the only thing I can think of is a bad switch, the GEM has failed, or you have no ground. I say no ground because you told me you connected the two wires together.

Just for the heck of it, take the brown/light blue wire and run it to a known good ground and see if that fixes it. Looking at the schematic, I notice there is a splice in the ground wire before it reaches its ground point. It may be bad. See picture 4. By the way, the nca for the ground wire indicates no color available.

Let me know if you have questions.

Joe
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Tuesday, August 20th, 2019 AT 6:08 PM

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