Thread: What happened to your D3/D4 today?

Went for a drive today , 100 mtrs from just leaving home "boong" suspension fault , no special programs etc, plug in hawkeye and fault code U0416 , something about invalid data from vehicle dynamics.. Anyway continued on and basically spent most of the day with vehicle lowered as the fault would return instantly when cleared and if i stopped and locked /unlocked the car the suspension just never raised.

Now i had this issue about 5 yrs ago and after much trouble shooting it turned out to be a faulty new battery , i replaced my battery 6 months ago so thought surely not twice, so removed the battery and put on charger , disconnected the traxide system , checked all the earths near the battery, had a quick look at the connections behind the battery but all seemed ok.

tonight put the battery back in , start up and not even out the driveway and "Boong" same bloody thing... bastard i was watching the battery meter and it never dropped under 13.8V. pull forward , put my foot on the brake and noticed no brake lights...mmmm , pump the peddle and brake lights work... try a few more times and then they stopped working again...mmmm

fitted spare brake light switch , clear faults and go for a 15 min spin and no faults...

So what runs thru the brake light switch that would affect the vehicle dynamics signal...

Off to ford tomorrow to buy another switch .

Bulletman

Originally Posted by Bulletman

So what runs thru the brake light switch that would affect the vehicle dynamics signal...

I think ABS uses brake light switch as an input.

Cheers,
Scott

Originally Posted by Spence

Took the second row seats out (already taken 3rd row out) made a full bed setup.

Nice work

Originally Posted by Bulletman

Went for a drive today , 100 mtrs from just leaving home "boong" suspension fault , no special programs etc, plug in hawkeye and fault code U0416 , something about invalid data from vehicle dynamics.. Anyway continued on and basically spent most of the day with vehicle lowered as the fault would return instantly when cleared and if i stopped and locked /unlocked the car the suspension just never raised.

Now i had this issue about 5 yrs ago and after much trouble shooting it turned out to be a faulty new battery , i replaced my battery 6 months ago so thought surely not twice, so removed the battery and put on charger , disconnected the traxide system , checked all the earths near the battery, had a quick look at the connections behind the battery but all seemed ok.

tonight put the battery back in , start up and not even out the driveway and "Boong" same bloody thing... bastard i was watching the battery meter and it never dropped under 13.8V. pull forward , put my foot on the brake and noticed no brake lights...mmmm , pump the peddle and brake lights work... try a few more times and then they stopped working again...mmmm

fitted spare brake light switch , clear faults and go for a 15 min spin and no faults...

So what runs thru the brake light switch that would affect the vehicle dynamics signal...

Off to ford tomorrow to buy another switch .

Bulletman

When the system trips and goes to the “lowered” height setting you can sometimes overcome this with the GAP tool by adding 50mm to the standard height. Can also do the same with GOE lift rods.

Now when the fault occurs and it drops the suspension it will actually be tricked into being at normal height.

I ran for several months like this without any drama’s whilst fault finding a problem.

Originally Posted by LRD414

I think ABS uses brake light switch as an input.

Cheers,
Scott

And cruise control.

Originally Posted by loanrangie

And cruise control.

Enough things depend on the switch enough to fully freak out the car. Blown filament globes in the D3 cause similar issues.

Originally Posted by PerthDisco

Enough things depend on the switch enough to fully freak out the car. Blown filament globes in the D3 cause similar issues.

The vehicle also checks braking and acceleration inputs. If it sees both it won’t behave.

Originally Posted by Bulletman

So what runs thru the brake light switch that would affect the vehicle dynamics signal...
Bulletman

The brake switch inhibits EAS height changes and probably other EAS stuff, too.