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PostPosted: Sun Oct 18, 2020 7:47 pm 
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The car in question isn't a Saab but the SRS light does not illuminate on startup when it is normal on this car for it to do so. The government website link below is to an article from 2014 where it says:
Government MOT advice wrote:
When testing SRS MIL (Malfunction Indicator Light) lamps we are only looking to see if the lamp indicates if there is a fault with the system. If no lamp is present or it doesn’t illuminate then it can’t indicate a system fault, so it can’t be failed.

https://mattersoftesting.blog.gov.uk/co ... t-testers/

The current MOT inspection manual (updated October 2019) lists only one defect for the SRS light:
MOT inspection manual wrote:
7.1.6. Supplementary restraint system (SRS)
Defect Category
(a) An SRS malfunction indicator lamp (MIL) indicates a system malfunction Major


What I (my other half, actually) need to know is, is the advice above regarding a non-illuminating lamp still current or have subsequent MOT rule changes made it obsolete?
A query sent via the government website some months ago (before lockdown) is still unanswered. I know there are some MOT testers here. Can anyone give an up-to-date answer?

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PostPosted: Sun Oct 18, 2020 10:31 pm 
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I've read elsewhere that a non functioning SRS lamp is cause for an advisory, while a permanently illuminated one is cause for a fail. It's not tested as per the ABS warning light, which has to come on and extinguish after ignition.

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PostPosted: Mon Oct 19, 2020 7:35 am 
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I did find mention on the Internet of VOSA Special Notice 01-13, which supposedly deleted an original reason for refusal:
Section 5.4, RFR 2 "SRS warning lamp inoperative" has been deleted.

However, I cannot find this special notice in the list on the government web-site:
https://www.gov.uk/topic/mot/manuals

Perhaps it no longer needs to be listed since that RFR does not appear in the current MOT manual and therefore doesn't need to be deleted?

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PostPosted: Mon Oct 19, 2020 11:30 am 
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Checked the bulb? :wink:

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PostPosted: Mon Oct 19, 2020 11:37 am 
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McVities wrote:
Checked the bulb? :wink:

It's a surface-mount LED, soldered to the PCB in the instrument cluster. The LED does illuminate when we install a faulty SRS ECU.
The question is, will it pass an MOT, albeit with an advisory?

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PostPosted: Mon Oct 19, 2020 11:43 am 
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BillJ wrote:
McVities wrote:
Checked the bulb? :wink:

It's a surface-mount LED, soldered to the PCB in the instrument cluster. The LED does illuminate when we install a faulty SRS ECU.
The question is, will it pass an MOT, albeit with an advisory?

It could be a fault with the SRS box, have you tried a known good one?


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PostPosted: Mon Oct 19, 2020 12:32 pm 
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We don't have a known good one. Only one that lights the lamp all the time and one that never lights it at all, although it is supposed to have been working in another car (same car model, same part number).
The question is, while we diagnose and try to fix the problem, will the car pass an MOT or is it not worth bothering to try?

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PostPosted: Mon Oct 19, 2020 5:52 pm 
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BillJ wrote:
We don't have a known good one. Only one that lights the lamp all the time and one that never lights it at all, although it is supposed to have been working in another car (same car model, same part number).
The question is, while we diagnose and try to fix the problem, will the car pass an MOT or is it not worth bothering to try?

I can't tell you whether it will pass or not but you could always talk to the tester before you book the test, assuming you know who the tester is.


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PostPosted: Mon Oct 19, 2020 7:37 pm 
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It's quite some time since I encountered this problem on a Volvo S40. I clarified with the tester my understanding, as per the bulletin at the time. If the light is on all the time, it indicates a fault and is a fail. If the light doesn't come on at all, it doesn't indicate a fault and is an advisory. That was 6 years ago but I'm not aware that anything has changed.


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PostPosted: Mon Oct 19, 2020 10:21 pm 
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It'd be a 555 latch circuit for me if I had the skills.

(As an experiment of course)

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PostPosted: Tue Oct 20, 2020 8:59 pm 
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I think we have enough information now to have a useful discussion with the tester, thanks. All our cars usually go to the same place for MOT so they're happy to discuss things with us. We'll have that chat before we book a test. There are still 3 more urgent MOTs to get through on the fleet before we do that one.
Thanks, everyone.

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