Thread: Cant get compressor to run

You are going pretty well with the illumination of potential problems.

When you say you checked the relay did you do both?
The one under the bonnet in the fuse box (expensive from memory $70) and the one under the passengers seat.

It sounds like everything is lined up but no signal to go is forthcoming.

Could it be the dumb computer that runs the compressor?
I think the computer is unlikely.

You are not in EAS fault mode on the dash are you?

Stick with investigating under the passenger seat

I hope you get of your bump stops soon

I got it unlocked ok and can manually pressurise the system so still mobile and semi functional. If it persists I will just bang on the bypass valves till sorted. I have not checked the under seat relay so thanks for pointing that out.

Just found this from Storey Wilson after looking for relay probs so will post it here so I can find it again




First Question always is; What are you getting back in the Rx buffer. Until you get only FF during communications idle, then none of the operations with the EASunlock software will work.

If you get FF and 1 in the Rx buffer, you are on the wrong comm port. (You are on a internal laptop loopback port)

If you get nothing back in the Rx buffer during communications idle, then your USB 2 Serial adapter is not working or your cable is wrong, or the Range Rover wiring is suspect. (No communications at all; Tx and Rx are bad)

If you get 28 or 80 back in the Rx buffer then your USB 2 Serial adapter might stil be acting up, or your cable might be incorrect, or the Range Rover wiring might be suspect or the EAS delay relay might be suspect. (Some communications; Tx and Rx are working; EAS power reset is not working)

Overall, make sure you have drivers installed for the USB 2 Serial adapter. Make sure you have the windows device manager open when you plug the USB to serial adapter in. Watch the new comm port appear in the windows device manager. When the comm port appears use that inside the EASunlock software configuration for the comm port number. You can also shift the comm port number that the USB 2 serial adapter emulates. Changing the enulated serial port can sometimes also cause the adapter to suddenly start working.

Make sure the cable is correct. I think the cable is the most likely cause of the lack of communications. You have tried a laptop with a built in RS232 so that is uaually a good working test. But that failed. I think your cable is bad and then next I would inspect the OBDII port wiring harness by droping the footwell pannel. Then I would inspect the EAS ECU C117 Wiring harness for damage.



Wiring harnesses in the Range Rover can go bad. I usually ask if the heater core has ever leaked. If you have had a coolant leak in the heater core, then the OBDII port and some of the wiring harnesses that are next to the heater core are suspect. But check the OBDII port first it is easy to get to and can be cleaned with some contact cleaner.

Next I inspect the EAS ECU. The EAS ECU is located under the Left hand seat. Some pannels will need to be removed and you will also need a medium sized phillips screwdriver with a very very short handle. The EAS ECU is located on the bottom. Use a flat head screw driver to pop the EAS C117 multiplug connector off. Inspect the wiring harness and the C117 pins. If the connector has ever been opened, make sure that the plastic retaining combs are still on either side of the C117 connector. The plastic retaining combs keep the pins in contact with the EAS pins. Some souorces also say that the rubber gasket on the C117 connector is too thick and prevents the connector from seating correctly with the EAS computer. So try removing the rubber gasket for testing. Long term, you can remove about 1/3 of the thickness of the gasket with sand paper and refit.

Also inspect the EAS delay relay. The EAS delay relay is located under the left hand seat on the outer side of the seat. It is a black tall rectangular relay, which has its own wire harness and is attached to the seat subframe with a rubber groumet. Make sure that the wires are in good shape. The EAS is power cycled during the EAS communications protocol. If you can not hear or feel the EAS delay relay clicking when you press "initialize", then it might be bad. Try replacing it.

Can anyone sticky this thread answer? I do not want to type it all again.
__________________
Storey Wilson
RSW Solutions LLC
www.RSWsolutions.com

I am a complete Dick that relay i gave you the part # for is in fact for the brake booster pump i must have had 1 too many beers and forgot what the problem was.

As your last post states look into things under the passengers seat.

Wayne - I am confident that you simply have a comms problem between the PC and the OBDII port. I trust you are NOT using a EAS Unlock Cable and USB-Serial Adapter from Hard Range?

Mine work, and are recommended by Storey Wilson. PM me your address and I will send you a set (no charge, you've helped me out a few times in the past). If you like them I know you will do the right thing...

AULRO P38 Owners SPECIAL
EAS Unlock Cable, USB-Serial Adapter, driver and EAS Unlock software on CD, plus Express Postage to anywhere in Australia for $44 inc GST (payment via PayPal to sales@hardrange.com or direct deposit only).

Offer extended to all members with paid AULRO subscriptions. Remind me in your PM or e-mail to info@hardrange.com

Cheers, Paul.

Paul, have sent $44 via paypal for the lead. Never been totally happy with mine anyway
Things seem very odd. The software unlocked the system and the suspension seems to work fine. I can force the pump to run with the software but it wont run under normal conditions. I have been able to get faults up on a couple of occasions but most times no response. I can feel the relay click when I initialise the software but no figures in left column. Also the car seems to know that theres something plugged in but usually all 4 eas lights come on and the 55klm warning comes on. This is not happening in a solid fashion, comes and goes with lots of beeping

Would still like to know if shorting pins 1 and 8 on the ecu plug will force the compressor to run or have I already proved good but getting the compressor to run via EAS unlock

On the EAS connector under the passenger seat, pin 1 is power and pin 8 is the compressor. Good write-up here suspump

Haven't needed to do this myself in a couple of years, but it did work, and I think I still have the 4-way "pigtail" and reference sheet in my glove-box should I ever need it again.

Will send your AULRO EAS Bundle tomorrow

Also check the pins and rear connections on the OBDII port to make sure they are clean and make good contact.

Cheers, Paul.

Thanks for that, have read that before but somehow could not find it when needed. My understanding now is that if 12v appears at pin one on the ECU plug with ignition on it proves the delay relay is Good.
I will check the obd2 connector and wait for your lead as its looking like a comms issue as you suggested.