BHI unit.

[tomfrog]

Hello from AUS. Could anyone advise me how to check the standalone pressure generator? After two years of trying to get the ride right,I hope it might have NO power connected. C5X7.+3 See ya.and thanks Tomfrog .

[GiveMeABreak]

Hi Tomfrog, I can't make any sense of your post at all - sorry.
Can you give us an indication of what the issues are:- are you driving it presently? If so, what are the symptoms of the ride? If not is the car rising on start-up / opening of the doors? Can you hear the BHI pump whining? Can you raise / lower the suspension? I assume you mean you have Hydractive 3+? If there was no power to the BHI, you wouldn't be able to raise or lower the car. If you can, then the ride height is unlikely to be the BHI, but may be a faulty front or rear height corrector / or the speheres may need replacing. How old is the car and how many miles has it done (and a VIN would help too).

Once we have some more info, we might be able to help

[tomfrog]

Hello ,The suspension does everything to be expected BUT, out on our regional roads,the BHI unit is not doing its job{roll, forward -aft,yaw etc}.I feel its an electrical problem possibly from rear anti roll bar. But then again,I would love to ride in a cit as it should ride. before I go to the marble forrest. Thanks A lot .Tomfrog

[tomfrog]

Sorry,Car is a 09 c5x7 100000ks vin VF7**************[VIN obfuscated, can be read by forum staff], spheres tested ok,, mechanical parts replaced, dealers looking for extra cash. Thanks Tomfrog

[GiveMeABreak]

If the suspension is raising and lowering on command using the electronic control and is responding normally, I don't think your BHI is the issue. If you raise the car to the intermediate setting (1 above normal) then drive off, the car should very quickly return to normal height after you reach 25 Mph or exceed 40 Km/h. If it does this, then it would seem the BHI is operating fine. The BHI is just the high pressure pump and on your model contains the suspension ECU.

The actual ride heights will be determined by the readings obtained from the front and rear electronic height corrector units. Other data from the Autobox, ABS / ESP / Steering Angle Sensor etc. are also used to adjust the system as needed based on driving conditions.

I don't know what you are comparing the ride to, but don't expect the X7 to ride like the old DS, GS, CX models - these had a lot more pitch and roll. The X7 is arguably a firmer ride - but can still suffer the side roll when cornering on country roads for example, causing the passengers to 'rock' - if you put the car into the 'SPORT' setting, this will help almost immediately in cutting out a lot of the yaw and roll experienced going round corners for example.

I would suggest you try and get a ride in another Hydraulic X7 for comparison if you can, before spending out on problems that may not be there. If you can get it on Diagbox, you will be able see if there are any problems, but you will be able to check the suspension reference heights. The front Suspension Reference height should be 160mm (+ or - 6mm) and the rear 106mm (+ or - 6mm). Note these are not the programmed heights - just the reference heights. Obtaining the actual heights involves a series of specific measurements and calculations to arrive at a calculated height that is compared to the reference heights. Citroen should be able to check these if you are concerned - but there is a set procedure to follow (you can't just enter the heights into the Lexia - the physical measurements need to be taken, calculated and these values entered into the system, which will then work out and adjust the values again - which will be different to your measurements)!

Of course, we shouldn't forget leaks - have you checked the fluid levels (measured on the LOW suspension setting) for a rough check?

You can always try the BSI reset procedure that usually sorts out lots of gremlins with cars with a BSI. Follow it without skipping any parts - the timings are minimums - don't open doors, windows or operate any equipment whilst performing the procedure. This will reset the BSI and all the ECUs and may cure your problem. If not let us know.

• Put the driver's window down, lift the bonnet and ensure all equipment is switched off.
• Ensure all doors are closed and remove key from the ignition.
• Wait for 3 minutes, disconnect the vehicle battery and wait at least a minute.
• Reconnect the vehicle battery, wait a further minute (do not open doors).
• Switch on the side lights through the driver's window.
• Switch on the ignition and check system's functionality.
• Hold lock button on key down for 10 seconds.
• Remove key open & close door test central locking system.
• Start the engine and complete the system's check.
• Failure to follow this procedure could result in incorrect operation of many BSI related items.

[tomfrog]

Looks like a trip to the big smoke{Sydney},500ks to find Lexia .Will let you know results. Thanks Gimmie A brakeTomfrog

[GiveMeABreak]

Might me worth a look on the Aussiefrogs forum over there to see if any members with an X7 are near you or have a Lexia kit?

[xantia_v6]

Looks like a trip to the big smoke{Sydney},500ks to find Lexia .Will let you know results. Thanks Gimmie A brakeTomfrog

It would perhaps be better value to buy one of your own?

[GiveMeABreak]

Juat another thing Tom, before you go off on 'Walkabout', you could try putting a bit of silicone spray grease around the height corrector linkages in case these are sticking. This happened on my X7, where the car wouldn't rise properly - although these are electronic sensors they have a 'Dog & Bone' linkage as can be seen on the picture below. This can sometimes get stuck. preventing the correct height information of the vehicle getting sent. If you look at 1 & 3 and 8 & 10, you can see the areas to check. Don't slacken off or adjust the brackets holding the sensors on - otherwise the system will likely need to be calibrated again! If these are moved, it will affect the height position and consequently the readings.



Re the Lexia:
Easydiagnostics are selling the kit in the UK for £108.75 and I've checked the shipping to down under - £26 on top of that. Not sure if you would get the 20% UK VAT taken off if you are a business in Aus... Anyway Easydiagnostics are used by many members here - I would n't risk a Chinese clone from the Bay as support can be an issue as can the quality of the hardware and components if you were to consider buying a Lexia Kit.
Link: Easydiagnosics

[xantia_v6]

Not sure if you would get the 20% UK VAT taken off if you are a business in Aus...

Aus being outside the EU, they should not be charging VAT even for a sale to an individual, but some UK firms already take that into account by reducing theire postage rates to the antipodes... Best to ask them.

[tomfrog]

Citmen I will keep you in the picture When??? Tomfrog