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Discussion Starter #1
I still have not sorted the SRS light. I was due to take the car to a Land Rover electrical specialist who has a T4 analyser but he is 20 miles away and the MOT has expired and I don't want to risk driving illegally. I have fitted new plugs under the seats, fitted a new rotary coupler, tried spare seat tensioners, tried a resistor in place of the steering wheel air bag and even checked wiring from the control unit for continuity. I have been told that I should try a different control module since this is the only thing left and one from eBay would be much cheaper than a T4 session. The problems I now have are the part number on my module is YWC 001600 and those for sale on eBay are part number YWC 105230. Rimmer Brothers advertise ones like mine but they state they are for a two air bag car. My car does not have a SRS above the glove box so must be a single air bag. The modules from Rimmers are VERY expensive. Can someone please let me know if a YWC 105230 would work in my TF (a 2005 135) and perhaps clarify the position regarding Rimmers saying the unit I have is for twin air bags.

Jan T
 

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I still have not sorted the SRS light. I was due to take the car to a Land Rover electrical specialist who has a T4 analyser but he is 20 miles away and the MOT has expired and I don't want to risk driving illegally. I have fitted new plugs under the seats, fitted a new rotary coupler, tried spare seat tensioners, tried a resistor in place of the steering wheel air bag and even checked wiring from the control unit for continuity. I have been told that I should try a different control module since this is the only thing left and one from eBay would be much cheaper than a T4 session. The problems I now have are the part number on my module is YWC 001600 and those for sale on eBay are part number YWC 105230. Rimmer Brothers advertise ones like mine but they state they are for a two air bag car. My car does not have a SRS above the glove box so must be a single air bag. The modules from Rimmers are VERY expensive. Can someone please let me know if a YWC 105230 would work in my TF (a 2005 135) and perhaps clarify the position regarding Rimmers saying the unit I have is for twin air bags.

Jan T
Here MGF MG TF SRS AIRBAG CONTROL UNIT ywc001600 | eBay ?
 

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MGROVER SOLUTIONS has T4 and he chaged me £30 to hook up mine to look for a fault- it didnt find the fault but found others that showed TP out of adjustment. Im in Kent, so is he. Might be worth a shot as your man seems expensive from what you have written. I know that most peole say its the belt tensioners but youve been there and you are sugesting some expensive measures that might be incorrect. Ive been there and dont replace stuff unless im 90% sure, as I might be wrong!
 

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You say you’ve replaced the plugs under the seats, you have to make sure the 2 wires are connected the same way as original otherwise the SRS light will stay on. Where are you located? A PSCAN can diagnose these issues.
 

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Discussion Starter #7
Getting a wee bit more technical. I have now dismantled everything and have access to the plugs fitted to the main harness at the control module, under each seat and to the rear of the rotor coupling. So all air bags and restraints are isolated. I did this initially to check continuity of the wires from the control unit to the restraints and air bag. However if I connect my meter to the two terminals on the harness plug at the rotor it shows a closed circuit. I can also identify the other ends of the two wires at the module plug end and again they are all joined somewhere. Exactly the same applies with the two harness ends under the seats. I know there is a small clip in one of the sockets on the rotor coupling that shorts the terminals until the plug is inserted so is there something similar in the plug that fits into the control module.

Jan Targosz
 

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2006 MG ZR +120 (HQM) 2004 MG ZR 105 (IAB)
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The part number on your unit (YWC001600) is not the part number used by XPart/MG Rover;)

If you look at Rimmers parts list you will see two control modules listed for the F/TF up to serial number 5D639630, one for single airbag, and a different one for a double airbag.

YWJ101220 is the one for a single airbag car, and if you hover your mouse over the image to the left of the part number, you should get an enlargement pop-up displays on which you can see the yellow label has the number YWC001610 on it.

Likewise, the pic against part number YWC101230 (double air bag) has the number YWC001600 on the label.

If someone has fitted a module programmed for double air bags to a car that is only fitted with a single air bag, that module will constantly be seeking an input from the second air bag, and because it is not 'seeing' the second air bag (because no second air bag is fitted) it will constantly throw up an error and the SRS warning lamp will be constantly illuminated.

I am not sure whether it is possible to reprogramme a double air bag module to single air bag configuration, but if so it may be something within the capabilities of a pscan?? The last TFs were fitted with a different universal DCU which had be programmed to suit the SRS configuration of the car (using T4).

At any rate, it is probably easier and cheaper to source a good serviceable correct module (with the number YWC001610 on it).
 

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Discussion Starter #9
Problem now solved! Thanks for all the advice. I dismantled everything, steering wheel off, centre console removed and seats out so I could get to all the connections and check continuity of the wiring harness. Retractors and air bag obviously removed. I have a multi meter but it is ancient and I have only ever used the ohms setting to check for continuity i.e. to see a full scale deflection and would not want to use it for actually measuring resistance. However when checking the wire that goes from the plug under the passenger's seat to the retractor, the needle only went part way across the scale. I knew the plug was fine since I had soldered in new, well engineered ones so assume there was a fault with the yellow plug that fits into the retractor. After fitting a replacement wire, given to me by an upholster from a scrap seat, the light goes out and stays out. Maybe adjusting the seats can disjoint the wire at both ends.

Jan Targosz
 
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