C70 roof failure service required [Archive] (2023)

philrocks

Jun 4th, 2018, 10:06

Hey guys,

The dreaded day has finally arrived!

Roof will not go down when I press the button, the boot opens and does it cycle (although once it didn't complete the boot opening cycle before the message appeared), but the roof does nothing, and I get roof failure service required message.

Anyone any experience with this, how to diagnose what could be the fault, or typical costs at a garage?

Any help would be appreciated.

Have tried using it the past few days, and has never opened (fortunate it broke in the up position), so its a consistent fault.

Cheers
Phil

Sysyphus

Jun 4th, 2018, 14:22

Vida has a diagram all the sensors and switches, and a spreadsheet of their expected readings at each step of the opening/closing procedure... and you can also read off the actual positions... there’s almost certainly a code stored telling you which part of the system is tripping the maintenance required flag...

Beyond that there is a breakout box can be used to test/diagnose the CRM, but as far as I know that is a dealer only tool, it would likely be quicker, cheaper and easier to source a replacement from a breakers yard than attempt diagnosis/repair.

Best of luck, and let us know how it turns out for you.

Afterthought:
It is also possible to narrow down what has gone wrong by the point in the process that it stops working. After I installed my SmartTop module mine was not moving at all... throwing the maintenance required error immediately after the windows dropped. Pulling the CRM out and examining it, I found that I had bent one of the pins, and was able to bend it back into shape and, knock wood, no issues since.

Sounds like yours is failing after the boot opens but before the roof unlatches... could be the sensor that signals the CRM that the boot is fully open, or something in the roof locking mechanism

volvo for ever

Jun 4th, 2018, 15:47

Difficult to say you must get codes read

I had one once where it wouldn't open so manually opened it to find cable at rear Sierra and latch arm bent .
Look at vida try calibration

philrocks

Jun 4th, 2018, 19:00

Unfortunately I only have 2 generic fault readers, one being a elm327 that uses an phone app. Tried a few apps, but none of them seem to be seeing any fault codes.

So I imagine its a vida specific thing.

HDAV

Jun 4th, 2018, 19:45

Cayman are good

https://www.caymanautos.co.uk

If check all micro switches had the Mrs door (not Volvo) fail and it was the switch in the door new from breakers good to go......

philrocks

Jun 4th, 2018, 20:08

Cayman are good

https://www.caymanautos.co.uk

If check all micro switches had the Mrs door (not Volvo) fail and it was the switch in the door new from breakers good to go......

Cheers, I had already checked them out, but they are 200 miles away, so will likely use my local specialist if I cant figure it out myself.

Clan

Jun 4th, 2018, 20:29

philrocks

Jun 4th, 2018, 21:22

Yeah I was thinking the same thing, the boot lid opens but the second part that extends out of the boot only goes about half way before stopping, so its likely a cable around there.

Will need to dig up some schematics for the wiring layout, and see if I can borrow a multi meter to check the cables.

Clan

Jun 4th, 2018, 22:30

Yeah I was thinking the same thing, the boot lid opens but the second part that extends out of the boot only goes about half way before stopping, so its likely a cable around there.

Will need to dig up some schematics for the wiring layout, and see if I can borrow a multi meter to check the cables.

it will be by a sharp bend which moves .. you will have to cut open the loom there to examine the wiring ...

philrocks

Jun 5th, 2018, 19:47

Been having a play around, and reading https://www.volvoclub.org.uk/tech/c70/2007VolvoC70-FullDetails.pdf (Very good doc)

I think a connection to s12 is gone, as when it stops, if I play with that cable and press the close roof button, it works straight away (and once forgot the roof was broken after it closed).

Question is, anyone know if you can order replacement cable, part numbers or anything?

Sysyphus

Jun 6th, 2018, 01:06

That’s an awesome document, thanks for sharing...

Based on a quick dig around in VIDA, pretty sure the sensor part number is 1385262, seems to be available at most Volvo parts websites stateside for $120ish and up...

The wire is going to be part of a harness, looks like 31325315, but check with your VIN, there’s a chassis number split, although that’s “on sale” at prices in the $600 range, so I figure you will want to consider an alternative to replacing that.

philrocks

Jun 16th, 2018, 13:24

Just for completeness sake:

I put in 3 different fault readers, standard OBD one, cheap OBD bluetooth - mobile app one, and Lightfoot device prototype (My companies one, only reads MIL codes). They picked up no faults at all.

Took it to a garage, which picked up:
Immboiliser (CEM) - 3A00 - Engine control Unit, signal to high, permanant.
Multifunction (CEM 1) - 3A00 same as previous.
Engine (B5354T3 2.5L ME9) - 740C - CAN: communication CEM, signal to high, permanant

The garage used some swedish kit (not VIDA DICE), and the above dont really help me get any closer. Just storing it here for reference.

philrocks

Sep 1st, 2018, 14:06

Took it to a Volvo specialist with VIDA, bunch more helpful codes:

AUD-0003 Loudspeaker Front Right signal missing
CEM-3A00 ECM, Software faulty signal
CRM-2032 Hall sensor 5, Short to gnd, disconnected or internal error
CRM-20A2 Hall Sensor 1, (same as above)
CRM-20F2 Hall Sensor 10, (same as above)
CRM-2112 Hall Sensor 12, (same as above)
ECM-740C communication, CEM signal to high
PAM-E010 power supply too high voltage difference

Hall sensor 5 and 1 are on the same circuit (in the windscreen) and 10, 12 same circuit (in the boot).

Need to check them, but no idea the best way to do it, also little disheartened that there is 2 sets of issues, doesn't help localise it to one place (such as the boot).
Anyone seen something similar, or got any suggestions?

As always, any suggestions welcomed.
Cheers

Clan

Sep 1st, 2018, 14:16

Took it to a Volvo specialist with VIDA, bunch more helpful codes:

AUD-0003 Loudspeaker Front Right signal missing
CEM-3A00 ECM, Software faulty signal
CRM-2032 Hall sensor 5, Short to gnd, disconnected or internal error
CRM-20A2 Hall Sensor 1, (same as above)
CRM-20F2 Hall Sensor 10, (same as above)
CRM-2112 Hall Sensor 12, (same as above)
ECM-740C communication, CEM signal to high
PAM-E010 power supply too high voltage difference

Hall sensor 5 and 1 are on the same circuit (in the windscreen) and 10, 12 same circuit (in the boot).

Need to check them, but no idea the best way to do it, also little disheartened that there is 2 sets of issues, doesn't help localise it to one place (such as the boot).
Anyone seen something similar, or got any suggestions?

As always, any suggestions welcomed.
Cheers

90% chance it is a broken wire where the loom flexes near a hinge on the mechanism , highly unlikely to be the sensor itself ...

philrocks

Sep 1st, 2018, 14:25

90% chance it is a broken wire where the loom flexes near a hinge on the mechanism , highly unlikely to be the sensor itself ...

Thats my thought, and I have a cuplrit wire I want to check, but no multimeter atm to check it, and going away for a week, so gona be a few weeks till I can check. But its the 1,5 that confuse me, as that is in the windscreen that the roof latches on to (so no moving part, unless its somehow tied to 10/12)

Clan

Sep 1st, 2018, 14:27

Thats my thought, and I have a cuplrit wire I want to check, but no multimeter atm to check it, and going away for a week, so gona be a few weeks till I can check. But its the 1,5 that confuse me, as that is in the windscreen that the roof latches on to (so no moving part, unless its somehow tied to 10/12)

maybe they need adjusting ,a moving part has to pass by the sensors at the top of the windscreen ... a wiring diagram may explain it though .

Knockinroe

Jul 3rd, 2019, 16:22

I know this is an old thread - but just wanted to say a huge thank you. The link to the PDF allowed me to get my roof working again!

Phew!

Baxlin

Jul 7th, 2019, 15:15

My thanks too, using the pdf I think I have traced my roof's problem to sensor S3, situated near the NS boot hinge, but unfortunately I’ve not been able to locate its actual position from the line drawing.

The symptoms are, that the roof works fine, either from the OE switches, or the SmartTop module, but if I press the yellow button to facilitate loading while the top’s down, it doesn’t work, and the roof will not then close, without many, and I mean many, presses of the OE roof close button.

The message 'roof failure service required' comes up, but once the roof has finally decided to close, the message can be deleted with the reset button, and the roof works fine unless/until the yellow button is pressed.

Am I right in suspecting this sensor, and is its replacement a diy job? If so, does anyone have a piccy to show me exactly where it is, please?.

Many thanks, and if this is a thread hijack, please accept my apologies.

Malcolm

Clan

Jul 7th, 2019, 21:49

My thanks too, using the pdf I think I have traced my roof's problem to sensor S3, situated near the NS boot hinge, but unfortunately I’ve not been able to locate its actual position from the line drawing.

The symptoms are, that the roof works fine, either from the OE switches, or the SmartTop module, but if I press the yellow button to facilitate loading while the top’s down, it doesn’t work, and the roof will not then close, without many, and I mean many, presses of the OE roof close button.

The message 'roof failure service required' comes up, but once the roof has finally decided to close, the message can be deleted with the reset button, and the roof works fine unless/until the yellow button is pressed.

Am I right in suspecting this sensor, and is its replacement a diy job? If so, does anyone have a piccy to show me exactly where it is, please?.

Many thanks, and if this is a thread hijack, please accept my apologies.

Malcolm

In my experience the "sensor fault" has never turned out to be the sensor , the wire from the senor in the loom breaks , usually on the left side where the most bending is caused by the hinge area

Baxlin

Jul 8th, 2019, 05:30

In my experience the "sensor fault" has never turned out to be the sensor , the wire from the senor in the loom breaks , usually on the left side where the most bending is caused by the hinge area

Many thanks, it could well be the case here, as the car lives outside with the top up, but driven top down at every opportunity, summer or winter.

Clan

Jul 8th, 2019, 10:01

Many thanks, it could well be the case here, as the car lives outside with the top up, but driven top down at every opportunity, summer or winter.

you might be interested to know that when the car was launched the volvo press cars had over 6000 roof operations on one car they measured at one show weekend with no problems . ( there is a counter in the ECU )

Baxlin

Jul 8th, 2019, 11:27

philrocks

Jul 15th, 2019, 22:40

I know this is an old thread - but just wanted to say a huge thank you. The link to the PDF allowed me to get my roof working again!

Phew!

Thats awesome to hear, out of interest what was your issue? and how did you solve it?

smithy1981

Oct 29th, 2019, 12:08

Hi guys new here, roof doesn't go down make a noise or any lights come on on the switch nothing fuse 35 seems ok and changed not sure its the right fuse though its not clear.

could it be the switch or something bigger?

thanks in advance

Dan

Clan

Oct 29th, 2019, 12:47

Hi guys new here, roof doesn't go down make a noise or any lights come on on the switch nothing fuse 35 seems ok and changed not sure its the right fuse though its not clear.

could it be the switch or something bigger?

thanks in advance

Dan

you have a message in the dash about it? have you got the load divider fully down in the boot?

GrimReaper1970

Mar 22nd, 2020, 19:28

Hi folks
I have purchased an 02 C70 rag top, the roof did work, now doesn't and I notice a ref to a PDF wiring diagram. Would anyone know, have or point me in the right direction for it please.

TIA
Glenn

GrimReaper1970

Mar 22nd, 2020, 19:32

Clan

Mar 22nd, 2020, 21:13

Hi there, you wouldn't happen to have that PDF still per chance could I have a copy please?
Many thanks
Glenn

you will need to read the fault codes first and see which sensor is giving a false reading and then how to locate it ... the odds of it being one of the 17 sensors is very slim , It is likely to be the wire broken that feeds the particular sensor , it can break on the left side where the loom flexes as the roof folds up .
This is a very complex but reliable device , it needs a lot of understanding to work out what's going on , but the fault code is a good lead ..

dme123

Mar 31st, 2020, 16:35

The posters '02 will be the Mk1 soft top. That's a far more complex and failure prone set of mechanisms than the hard top in the Mk2. The PDF discussed here won't help you, try posting in the relevant section for that model:

https://www.volvoforums.org.uk/forumdisplay.php?f=16

David C70 D3

Mar 26th, 2022, 14:41

[QUOTE=Baxlin;2534452]

Hi Baxlin,

I am experiencing the same issue as you with the "yellow button".

You wrote the following:

The message 'roof failure service required' comes up, but once the roof has finally decided to close, the message can be deleted with the reset button, and the roof works fine unless/until the yellow button is pressed.

Can you tell me which is the reset button and how to use it?

Many Thanks

David