DB9 brake failure / traction control / emergency brake assis

[K33LER]

Hi there everyone

I’ve got db9 brake failure / traction control / Emergency brake assist faults coming up on the dash.

I’ve changed the pads, all abs brake sensors, the brake pressure sensor, the brake travel sensor, I’ve bled the brakes. My foxwell 510 Is saying ‘transmission control/ brake control/ central control

I’m wondering if I’ve missed something but I’m guessing the ABS pump is on it’s way out.

Anyone else had this? I’ve already swapped out the pressure switch and travel switch plus all abs sensors. Tyres are all at recommended psi too

[yvr]

I've had all those lights on the dash -- it was a bad hub assembly.

[K33LER]

update... I’ve done some further digging...
Brake failure stop safely / traction control temporarily off / abs failure.
I’ve recently replaced the rear n/s wheel bearing which made me think it was that. The sensor is reporting correctly.
Put my Foxwell 520 on the body OBD and it’s thrown up all this...

1) TRANSMISSION CONTROL MODULE
went into the fault details and it shows:
P1 935 active refer to service manual
Transmission oil temperature to up temp comparison FAULT

2) BRAKE CONTROL MODULE
Went into the fault details and it shows:
P0134 please refer to service manual
P0074 valve electrical failure
P0130 pressure sensor electrical failure
P0148 steering angle sensor - wrong identifier (this code clears when I want it to on the foxwell)
P0115 steering angle sensor CAN timeout (code clears when I want it to on the foxwell)

3) CEM/HS CENTRAL ELECTRONIC MODULE H/S CAN
Went into the fault details and it shows:
Open circuit or short circuit to voltage battery for r/t signal and tail lamps (funny that, as I replaced that unit with a second hand one a few months back)

Other things...
My battery is brand new, won’t last overnight so something is significantly draining it

My heated rear screen button flashes occasionally... god knows why.?

Any help (especially from Bamford Mike) would result in copious chocolate and beer being sent to your good selves 😊

[bullet7]

K33LER said:

Other things...
My battery is brand new, won’t last overnight so something is significantly draining it

Isn't this the clue? These cars are very battery sensitive. It could of course be something else but this has got to be your first port of call. Usually it's the tracker that drains.

[K33LER]

I’m a Halfords manager... I’ve swapped the battery under warranty and it still drains the hell out of a new battery

[JonnyCJ]

I’d disconnect the heated screen button and then check the battery drain.

Have you checked whether the heated screen is actually heating when it’s supposed to be off ?

[bullet7]

K33LER said:

I’m a Halfords manager... I’ve swapped the battery under warranty and it still drains the hell out of a new battery

Not doubting your qualifications, I meant that the battery drain is possibly what's causing the lights on the dashboard.

[KnowsAnAston]

The brake fault codes relate mostly to the pressure sensor or wiring faults, namely short circuits and high wiring resistance. I'd check the harness and have a look in the wheelarch at the condition of your ABS module and connector, they can get a lot of water thrown at them where they are mounte and corrosion of the harness could cause the high resistance.

There is also a tedious link to a faulty brake light switch with P0134, have you checked that your lights aren't staying on? That would cause the battery drain and could make the ABS module a little upset.

[K33LER]

The battery drain I have solved. It was the clutch on the air conditioning compressor switching on / off / on when the car was left. I diagnosed that with a multimeter on ‘amps’ with the neg disconnected and the multimeter connected between the battery and the neg lead. I then pulled each fuse till the amps draw reduced. I’ve been trying to find out what each relay does, as one of them will be (most probably) the cause of the switching on / off of the ac.

Mike from Bamford Rose has been in contact. He’s about 150 miles away so will struggle to get there during lock down. I will be making the journey at some point though.

[bullet7]

That's a result at least to find the cause of the battery drain. Presumably you are still getting all the lights with a fully charged battery and the compressor disconnected?

[K33LER]

Bullet7 yes... all still there I’m afraid. He believes it may well be a broken / degraded wiring issue from the abs module.

[JonnyCJ]

Ed Blasi sorted the exact same issue in my Maserati when he was at Christian Lewis. The Maser Indy had managed to right royally screw up the wiring.

[bullet7]

K33LER said:

Bullet7 yes... all still there I’m afraid. He believes it may well be a broken / degraded wiring issue from the abs module.

That would make sense. I had these lights up too at one point and my Foxwell pointed it to the connection to the abs sensor. It was a dirty connection, although I replaced the sensor as it wasn't that expensive. Good luck.

[Craig elam1]

Have look at bamford rose "tracker failure and electrical gremlins" video on youtube, It looks like your problem.

[MonkeyDoo23]

I had this. I had to use a dealer to get the code read to get the offending wheel(s). In the end got the garage to do it, but noticed that the wiring was also corroded so I had the sensor replaced (£70 for a piece of plastic and a magnet - thanks AM Solihul!) and a replacement cable. Problem went away.

[K33LER]

Just to resurrect my old thread... I’ve replaced my abs module with a tested, same part number unit That cured the ABS light issue and a whole host of other issues. I’ve replaced the brake pressure transducer. That sorted brake pressure error codes. I’ve replaced the brake pedal travel sensor as a precaution. I’ve replaced all wear sensors on the brake pads. The only issue I have now is “parameter mismatch between brake module and vehicle”. Took the car into Aston Martin Sevenoaks to get the abs module coded to the vehicle and they couldn’t do it. They couldn’t get rid of the parameter mismatch.
So I’m now replacing the yaw rate sensor... I know there are pics on scuderia parts showing a sort of location. But does anyone know where it ACTUALLY is?
I’ll replace it, I’ll let you know what happens. It’s only got the DSC light on / amber triangle...and traction control off / DSC messages.

[bullet7]

Wow K33ler, you really have had some work to do. Sounds like you could also do with a good independent down your neck of the woods to help with the diagnosis, is there one close? It's odd to have so many components fail at the same time - not impossible though. I've assumed that all the lights came on at the same time but perhaps they didn't or it was after a period of the car being unused. I've no idea where the sensor is on your car but if you're going to buy a new one, I'm sure you will identify where it is when you are under the car.

[K33LER]

Hi bullet... I’ve been to Bamford Rose. Mike diagnosed the dodgy abs module. Also sorted the tracker module (common fault).
I bought the later abs module with the wrong info for the car (2009 abs module / expecting carbon ceramics}. Decided to fir the correct part myself, did so, successfully. Buuut... parameter mismatch on foxwell 520 came up hence dsc light. Took to AM Sevenoaks, they couldn’t clear it so now, the last piece of the puzzle is a new yaw rate sensor.

[Wardaston]

Hi K33LER, I assume you fixed the issue eventually any chance of an update?
I have a wheel speed sensor error P0020 which will not clear after changing the sensor.
Thinking of using AM Sevenoaks to help me would you recommend them?

[Valleyboy76]

I have all the lights up and brake failure along with temp traction control failure, is it safe to drive?