Alarm goes off when car locked - 1998 Volvo C70

[sawilson]

Hey folks! My 1998 C70 has an issue where, not always, but sometimes when the car is locked, the alarm will go off. The horn does not sound, I'm not sure if it is even installed, but the lights flash, indicating the alarm system is activated. I do not have a fob, I only lock the car by the key on the door, or by pushing down the lock pin then closing the door. As I said, it isn't something that happens every time, probably 25% of the time.
Not that it matters too much, but there is no 210/211 fuse under the dash, and no plug for it either

Any ideas?

[xanthefin]

You dont have that relay which belongs to 850 series models. As you have 70 series you have VGLA module which does that work and it supports reading what is latest Alarm Cause and reading Live Data of different sensors to pin point problem(s) via OBD port.

[BEJinFbk]

There were some optional sensors that
may have been included on your car.
Is this a coupe or convertible?

[sawilson]

There were some optional sensors that
may have been included on your car.
Is this a coupe or convertible?

I have a coupe

[sawilson]

You dont have that relay which belongs to 850 series models. As you have 70 series you have VGLA module which does that work and it supports reading what is latest Alarm Cause and reading Live Data of different sensors to pin point problem(s) via OBD port.

Do I need to attempt to read the OBD2 codes while the alarm is going off? I don't think my scanner has ever shown the recent alarm thing.

[xanthefin]

You dont have that relay which belongs to 850 series models. As you have 70 series you have VGLA module which does that work and it supports reading what is latest Alarm Cause and reading Live Data of different sensors to pin point problem(s) via OBD port.

Do I need to attempt to read the OBD2 codes while the alarm is going off? I don't think my scanner has ever shown the recent alarm thing.

Depends what your reader is as not all has that feature as most universal readers only does fault code reading and that in own levels how deep they go. And no need when it happens as it (VGLA) remembers five latest cause of alarms from the past if such thing has happened which can be requested specifically with own command from the module.

[sawilson]

You dont have that relay which belongs to 850 series models. As you have 70 series you have VGLA module which does that work and it supports reading what is latest Alarm Cause and reading Live Data of different sensors to pin point problem(s) via OBD port.

Do I need to attempt to read the OBD2 codes while the alarm is going off? I don't think my scanner has ever shown the recent alarm thing.

Depends what your reader is as not all has that feature as most universal readers only does fault code reading and that in own levels how deep they go. And no need when it happens as it (VGLA) remembers five latest cause of alarms from the past if such thing has happened which can be requested specifically with own command from the module.

What scanner should I buy then that has this reading feature? I need a new one anyways

[xanthefin]

Do I need to attempt to read the OBD2 codes while the alarm is going off? I don't think my scanner has ever shown the recent alarm thing.

Depends what your reader is as not all has that feature as most universal readers only does fault code reading and that in own levels how deep they go. And no need when it happens as it (VGLA) remembers five latest cause of alarms from the past if such thing has happened which can be requested specifically with own command from the module.

What scanner should I buy then that has this reading feature? I need a new one anyways

As If from me asking as ready solutions i am guilty and developer of this: https://xiaotec.fi/?lang=en&a=10

Its for 96 years P80 models up to 2004 (like C70 or 40 series) to P2 Volvos which ever can be reach the modules with ELM327 interface (the good ones with V1.4b firmware levels. OBDLink original adapters or ELM clones with V1.5 Firmware with 28K50 PIC chip. Bluetooth works fine) and Android device.

For PC there is VolFCR with K cable but i cant confirm as i dont just know personally did it have Alarm Cause reading function.


Third option is dig and find original and official Volvo VST handheld scanner but those are rare and expensive.