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1995-2002 Range Rover P38A
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19 Posts
Discussion Starter #1
Hi I must be mad but bought another MOT fail 1997 V8, it was very cheap and with LPG and a RPI rebuilt engine...It may just live to fight another day! Okay using my Nanocom under SPS1 it reports " The harness check resistor is measuring open circuit." , well I checked the passenger airbag connector, this P38 doesn't have seat airbags so no connectors under seat, have had the spring under steering airbag fail on another P38 but never got this message!

Please can someone shed some light on the above fault message or what to check next?

Thanks
 

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For 97 you have a sensor at the battery and at the air filter box then the two airbags. I am surprised Nano com does better identify which component is registering the fault. I have no idea what the correct resistance readings should be for each component to check them. I've also never seen a blanket code like that either.
 

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1995-2002 Range Rover P38A
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Discussion Starter #3
Thanks...will check these next few day or two, when I disconnected passenger airbag Nanocom did say "Passenger airbag open circuit." but as you say bit vague on this one!
 

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The dual sensor MPS1 system was fitted to NAS models up until 1999 but the rest of world models got the SPS1 system from mid 96. These resistors are fitted on the SRS1 system 'at strategic points in the airbag wiring harness / loom giving the systems the ability to self detect open or short circuits'. Unfortunately, as the SRS system is not something that they ever intended anyone to start messing with, there's no information on where these strategic points are.
 

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1995-2002 Range Rover P38A
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19 Posts
Discussion Starter #5
Thanks Richard, I did find someone saying that if this fault shows at a dealer they are to recommend replacing the full SRS harness, bit extream but may just have to remove harness then check it on garage floor!
 

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1995-2002 Range Rover P38A
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Discussion Starter #6
Quick update, had a check tonight, found both lamps are missing from instrument cluster behind srs script, replaced both, reset fault but still get same message. I will try swapping srs ecu for known good one as see what happens!
 

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sounds like someone has tried to be cheeky and pull the bulb to get it through an MOT... the bulb not lighting up will be a fail.

quite possibly it could be the rotary coupler at the steering wheel has failed preventing the system to fault check the steering wheel airbag with a resistor open circuit fault
 

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1995-2002 Range Rover P38A
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I had a nagging SRS issue that was telling me the Drivers Air bag was shorted. I replaced the bag, no change, then systematically disconnected one sensor at a time, checking with Nano, and it reported each condition correctly. This included the driver's airbag as open circuit when unplugged, so not the rotary coupler.
Weeks of beating on the problem, and it turned out to be the ECU. Swapped a known good, fault code free one in, and problem solved.
I also note that the Nano does a very good job with the SRS system, and was invaluable in finding the issue. It can be fooled by a bad ECU however. Oh, and PO had removed both bulbs, which Nano detected......
 

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1995-2002 Range Rover P38A
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19 Posts
Discussion Starter #9
Hi Bolt, well went to scrapyard today and removed full SRS harness, driver and passenger airbag, steering cassette and SRS ecu. Started with fitting SRS ecu, got fault message "internal fault ecu" reset this and cycled the ignition and all clear..no fault message and no SRS issues! I like you found the Nano saw when I disconnected either airbag...I bought my Nano after getting fed up paying to get faults read...This is a must have bit of kit when you have P38's.

Next will rebuild air pump when parts arrive and sort the air suspension, fit rear shocks and middle box and back boxes..then off for mot!

Quick rant my P38 has full stainless system, this one has a stainless system too...but what a rip-off the back boxes are stainless...middle box stainless but all pipes are mild steel with more holes than a Tetley Teabag..what a con...stainless exhaust that's only partly stainless and mostly rusted beyond welding!
 
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