Burst suspension pipe at rear

[GiveMeABreak]

I can only think of either insufficient pressure in the LDS tank to get it going - especially considering the work that has been done lately exposing the circuit to a lot of air. Bleeding, which we have talked about, or a faulty pump internally - it may be making a noise but is it doing anything? If fully depressurised using Diagbox, it can still take 4-5 minutes to get pressure back before it starts to rise. - and also double check the inside height control is still not on the lowest position.

Lastly, although the pump is making a noise and possibly working - if the connections to the suspension ECU on the BHI are not working then it won't be commanding the electrovalves to open or close to allow the fluid in and out. So check those connections and the circuitry and fuses (on all fuse boxes) as it's not just the large 40 / 50A fuse - that's only for the pump.

[KennyW]

Thanks Marc,

I have been thinking along the same lines.

I think the refitting the battery will have to be done properly but my problem my car is stuck outdoors and leaving a window down is not the best. So I will fit it so I can check the voltages at the important places.

I will have to check the continuity between the electrovalves and ECU. The 40amp beside the battery and the 2 fuses in the glovebox 5 amp and 10 amp. They were all checked for continuity and fine. will check again.

I've managed to source a 2nd pump with out ECU for £100 which is much better than min price £250 up to £400 elsewhere.

I can't do anything at the moment, the weather is pants so wait and see.

Will get back once I carried some checks.

Is there anybody out there who repairs/ refurbishes these pumps ?

Is it worth speaking to Martin @ Pleiades ?

Kenny

[GiveMeABreak]

Re the window Kenny, regarding the BSI Reset / Battery Disconnect / Reconnect Procedure this has nothing to do with the procedure itself - leaving the window open is just for emergency access to get into the car if needed, so you can skip this part if required and the car is secured.

[KennyW]

Thanks Marc,

The pump I found is no longer available,so had to pay a bit more for another.

Also phoned Pleiades and they have found it is the solenoid on the side of the pump is the main problem, they just swap them over and that's usually it.

I'll get back to the forum with an update or prognosis.

Kenny

[GiveMeABreak]

I hope that solves it Kenny.

[KennyW]

Marc,

Do you have a diagram for the pins on the Suspension ECU ?

Are all 32 pins in use and if so where do the other 15 pins go ?

Can't find anything at the moment re the connector.

Thanks

Kenny

[KennyW]

Marc,

found this from reveue technique which others may find helpful

But, I cannot find the wires which connect to Injection ecu or abs ecu or steering angle sensor to hydraulic pump.

Just a bit of research while I'm stuck at home with the snow.

Kenny

[GiveMeABreak]

Hi Kenny

Here are the designations of the BHI 32 Pin connector, so you can see which ones are used and which are not on this vehicle. Unfortunately, connections to other ECUs involved is via the CAN network so there is no detail. But hopefully this can provide the type of information exchange and the pin designations.

Remember that this diagram is for the 4 Cylinder engines. The 6 Cylinder engines have an additional Suspension Computer (CSS) and that has 3 wiring blocks, one of which is a 32 pin connector - that probably connects to the 32 BHI Interface below as I believe that handles the control of the BHI computer.

Channel No.	Designation
A1	Not connected
A2	Body height sensor supply (Rear ) (+)
A3	Not connected
A4	Not connected
B1	Not connected
B2	Body height sensor supply (Before ) (+)
B3	Not connected
B4	Information RCD
C1	Not connected
C2	IS CAN High
C3	Not connected
C4	IS CAN Low
D1	Body height sensor supply (Rear ) (-)
D2	Not connected
D3	Not connected
D4	Not connected
E1	Body height sensor supply (Before ) (+)
E2	Line k information
E3	Not connected
E4	Body height sensor signal (Rear )
F1	Not connected
F2	Integrated electric motor control
F3	Not connected
F4	Front body height sensor signal
G1	Not connected
G2	Front hydractive electrovalve control
G3	Front hydractive electrovalve supply (+)
G4	Rear hydractive electrovalve supply (+)
H1	Body earth
H2	Rear hydractive electrovalve control
H3	Not connected
H4	+Battery

Component Description Table

Element	Designation
BB00	Battery
BCM0	Multifunction switch block
BFDB	Battery fusebox
BFH1	Passenger compartment 5-fuse box 1
BSI1	Built-in systems interface
CA00	Ignition switch
PSF1	Junction box - fuse box in engine compartment
0004	Instrument panel
1320	Engine ECU
1524	Supply cut-off relay
7715	Suspension ECU
7739	Hydroelectric block motor
7747	Front suspension electrovalve
7748	Rear suspension electrovalve
7702	Front body height sensor
7703	Rear body height sensor
7800	ESP ECU
7803	Stability control steering wheel angle sensor

Description of the Exchanges of Information

Connection No:	Signal	Transmitter / Receiver	Nature of Signal
1	Hydraulic Suspension Raising / Lowering / Sport Control	BCM0 / BSI1	Filament
2	Display of Fault Message	BSI1 / 0004	COMFORT CAN
2	Display: Body Height (Raising / Downhill)	BSI1 / 0004	COMFORT CAN
3	Speed of Rotation of The Steering Wheel & Direction Of Steering Information	7803 / BSI1	CAN Is
4	Vehicle Speed Information	7800 / BSI1	CAN Is
4	Hydraulic Suspension Raising / Lowering / Sport Control	BSI1 / 7715	CAN Is
5	Vehicle Speed Information	7800 / 7715	CAN Is
5	ESP in Regulation Mode Information	7800 / 7715	CAN Is
5	Micro Split Braking	7800 / 7715	CAN Is
6	Engine Speed / Engine Torque	1320 / 7715	CAN Is
7	Body Height Sensor Signal Information (Front)	7702 / 7715	Filament
8	Body Height Sensor Signal Information (Rear)	7703 / 7715	Filament
9	Vehicle Speed Information	7800 / 7715	CAN Is
9	ESP in Regulation Mode Information	7800 / 7715	CAN Is
9	Micro Split Braking	7800 / 7715	CAN Is
9	Hydraulic Suspension Raising / Lowering / Sport Control	BSI1 / 7715	CAN Is
9	Engine Speed / Engine Torque	1320 / 7715	CAN Is
10	Suspension Solenoid Valve Firmness Control (Front)	7715 / 7747	Filament
11	Suspension Solenoid Valve Firmness Control (Rear)	7715 / 7748	Filament

[KennyW]

Thanks Marc,

Trying to find this info is fun, It will give me an idea where to check, when I can find my car outside !!!!!!!!!!!

Kenny

PS I believe I finally worked out how the system works. Weather is going to settle down for a few days here so going to remove the pump and examine it on a bench.

Got a donor pump to fiddle with.

Will get back with an update.

[KennyW]

Another update refitted 2nd pump which was very clean inside with my ECU. Awaiting LDS fluid and dry weather to fit fuse box.

When I removed the fuse box in engine bay it appears somebody has been there before and fitted an earth fuse in the battery charger system unit wiring. For what reason I do not know ! I will confirm if the above is correct.

Thoughts please on a postcard !

Question: Do you set height to normal after pressurising system to get vehicle rise.

Vehicle is currently at lowest level. I will fill up to Max level move steering from lock to lock and re check level then pressuirise system raise to normal height and wait.

[GiveMeABreak]

Only fill it to between the 'A' and 'B' shown - never more than the mark at 'B' Kenny on lowest setting:

When finished and starting the car, just ensure the suspension control is set back to normal level first of all to see if it working, before carrying out the bleeding procedure, which requires the Highest setting, waiting until it has reached the maximum ground clearance, then the lowest setting, before carrying out the 10 SLOW lock to lock turns without holding the steering wheel at full lock. Then recheck fluid is between said levels on picture and wait for fizzing to disappear - then repeat if necessary.

Interesting about what you have found - will be interesting to see what you find.

[KennyW]

Update re wiring:

It would appear the wiring has been cut at BF01 fuse no1, supply and return have been joined together and in line fuse holder fitted with a fuse marked 'E' which I presume is an earth fuse !?

But, where is BF01 (Engine compartment fuse box)

Kenny

[GiveMeABreak]

PSF1 is the engine fuse box panel - but the BF01 is the one with the large fuses Kenny - underneath IIRC.

[KennyW]

Thanks Marc,

That is what I thought.

Do you have any diagram etc which can confirm what uses Maxi fuse 1 on my C5 x7 (Vin no VF7**************[VIN obfuscated, can be read by forum staff])

Kenny

[GiveMeABreak]

Here you go:

MF1: 50A Fan, Additional Heating Burner, Air Con., Fog Lamps
MF2: 80A Supplies, (BFH5) & (BFH12)
MF3: 80A Power Steering Electro Pump
MF4: 80A Supply (BSI)
MF5: 20A Supply (ESP)
MF6: 40A Supply (ESP)
MF7: 20A Active Suspension Variable Damping (V6 Models Only)
MF8: 80A Supply (BSI)