Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Search Today's Posts Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 1st August 2020, 13:20   #1
Fred Byrne
Regular poster
 
Rover 75 Saloon

Join Date: Jun 2018
Location: Ballynahinch
Posts: 83
Thanks: 33
Thanked 40 Times in 16 Posts
Default SRS Light

I was tidying the car and removed some cottonwool wadding that the previous owner had put under the left front seat. The SRS light came on afterwards. I put the wadding back and the light went out but after a few miles it lit again. I removed the front seat securing bolts and tipped the seat back so that I could get at the plugs. I wiggled and waggled the plugs . Cleaned them with switch cleaner but no joy. I then removed the yellow plug and soldered the wires. Still no joy.TOAF gives the following readings.

9134- Side Sensor; communication error
9035- Ignition Circuit IC4 sidebag front seat left resistance low
9132- Side sensor left plausibility error
9036 Ignition circuit IC4 sidebag front seat resistance high
9015 ignition circuit seat pretension left resistance too low

The only plugs I touched were the yellow and blue ones and I replaced the yellow plug with soldered joints. Can there be a polarity issue in the case of the yellow plug soldered connection? but both leads have the same colour coding.
Does the fact that the seat is tilted backwards at about 45 degrees matter? Or does the system require time to reset the codes? Hope some kind person can enlighten me please

Fred
Fred Byrne is offline   Reply With Quote
Old 1st August 2020, 13:51   #2
vitesse
Posted a thing or two
 
Rover 75 Saloon Auto Conn

Join Date: Jul 2011
Location: Gävle, Sweden
Posts: 1,356
Thanks: 196
Thanked 409 Times in 329 Posts
Default

Isn't the side sensor the under the carpet one?

Regards
vitesse is offline   Reply With Quote
Old 1st August 2020, 14:39   #3
Fred Byrne
Regular poster
 
Rover 75 Saloon

Join Date: Jun 2018
Location: Ballynahinch
Posts: 83
Thanks: 33
Thanked 40 Times in 16 Posts
Default

I think that is correct but I cannot understand why this sensor should fail in co-incidence with for example the seat belt tensioner. I' ll disconnect the sensor plugs and clean them but I'm not hopeful. Many thanks for your reply.

Fred
Fred Byrne is offline   Reply With Quote
Old 1st August 2020, 17:49   #4
ADO282
Regular poster
 
ADO282's Avatar
 
ROVER

Join Date: Jul 2020
Location: BRACKNELL
Posts: 45
Thanks: 6
Thanked 26 Times in 19 Posts
Default

I seem to recall the sensors on the early cars fail after being wet for prolonged periods.


When I removed the carpets from my car, although the carpets appeared to be dry, the foam stuff was sodden underneath.


The water had been coming in from around the big tube thing under the rear seat, which had a rusted hole in it.


When the garage read the fault codes on my car, the only thing coming up was the seatbelt tensioner circuit, which was due to a corroded connector, which has been replaced, so I consider myself to have dodged a bullet in that respect.


I'm sure some of the more experienced hands will come up with a detailed explanation for you.


Chris.
__________________
2004 Connoisseur SE V6 *** resplendent in Royal Blue
ADO282 is offline   Reply With Quote
Old 2nd August 2020, 17:45   #5
Fred Byrne
Regular poster
 
Rover 75 Saloon

Join Date: Jun 2018
Location: Ballynahinch
Posts: 83
Thanks: 33
Thanked 40 Times in 16 Posts
Default

I am now down to two interconnected errors, namely;
Side sensorcommunication failure
side sensor plausibility error

I don't know what a plausibility error is. Anybody know? Anyway sometime soon I'll get round to this problem again. MOT always appears on the horizon very suddenly and unexpectedly so must not delay too long
Fred
Fred Byrne is offline   Reply With Quote
Old 2nd August 2020, 19:22   #6
Mike Noc
Relax, it's a Rover.
 
Mike Noc's Avatar
 
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4.

Join Date: Jul 2009
Location: Hampshire
Posts: 10,138
Thanks: 2,285
Thanked 2,496 Times in 1,819 Posts
Default

A plausibility error is when the ECU's detect a response that isn't what is expected, but there isn't a known error condition to put it down to. For example with an ABS sensor, if some magnetic reluctor segments are missing in the wheel bearing when they pass the sensor the ECU will activate the ABS on that wheel at slow speeds because it thinks the wheel is locking up, as that is exactly what the sensor sees, or rather doesn't see, when the wheel actually does lock up. But if it keeps seeing the same wheel locking up when none of the others are then that isn't plausible, so it alarms a plausibility fault.

If you sort the sensor communicaion failure then more than likely the plausibility error will disappear too.
Mike Noc is offline   Reply With Quote
The Following User Says Thank You to Mike Noc For This Useful Post:
Old 2nd August 2020, 20:01   #7
t5tart
Posted a thing or two
 
MG ZT cdti

Join Date: Jun 2010
Location: Northants / Bucks border
Posts: 1,811
Thanks: 261
Thanked 204 Times in 182 Posts
Default

having just sorted out my SRS I can tell you yes polarity matters .. even though technically it doesnt I had the pretensioner code high resistence (after changing the ecu what a job)

the pre tensioner is the blue plug the airbag the yellow plug I did them with bullet connectors so I can a) remove the seat b) switch the polarity easily

the sensor is under the carpet (green or orange type) on the rail just forward of the rear seat mounts for the green type on the inner cill for the orange type


looking at your codes you need to do away with both under seat plugs asnd get another side impact sensor to test it

it only took me 2 days of head scratching and the interioor out to fix mine

to save confusion on the pre tensioner and the side airbag I put the female connectors one side and males the other and vise versa on the other plug that way they cannot be crossed over (if you plug the pretensioner into the airbag wiring and you get a fault it will point you to the wrong component )

so airbag side both femle on the car side both male on the airbag .. so polarity can be switched .. and the opposite on the pretensioner


dont forget to clear your codes when you make any changes to check .. I made that mistake thinking they would auto clear and re did wiring twice
__________________
now with ZT Diesel power after killing the connie and the zt180 combusting



check your sunroof drains and plenum drains http://www.buddy-icons.info/img/smile/1609.gif

t5tart is offline   Reply With Quote
The Following 2 Users Say Thank You to t5tart For This Useful Post:
Old 2nd August 2020, 23:14   #8
Fred Byrne
Regular poster
 
Rover 75 Saloon

Join Date: Jun 2018
Location: Ballynahinch
Posts: 83
Thanks: 33
Thanked 40 Times in 16 Posts
Default

I shall purchase a new side impact sensor. It won't break the bank. I guess that the problem is most likely the plug that supplies the impact sensor and that I presume is under the carpet. The car's year is April 2002 sp I imagine it will be a green sensor. Many thanks to everyone who responded
I'm going to bed bye bye!

Fred
Fred Byrne is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 01:07.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright © 2006-2020, The Rover 75 & MG ZT Owners Club Ltd