Reading Codes

[Alycidon]

So got a interesting problem with my 2005 D5. I get a You have 1 message, on pressing the read button the display goes blank and the amber triangle lights up. Any other messages can be read Low washer fluid, door open etc, Vida shows a few faults Internal air sensor not reading, alarm faults. So I can't pinpoint what the mystery fault is. I did hear that with the fault showing (or not in my case) and the amber triangle lit there is a way to find what it is by pressing the read and trip reset in a specific order.
Any suggestions ?

Regards, Paul.

[gmonag]

This method will only tell you if there are DTCs in any module

Volvo hidden menu – procedure
Turn ignition to II position.
Press and hold READ button on the left stalk.
Press twice rear fog lights button. You should see “CHECKING DTCS” message on the DIM.
Release the READ button.
After few seconds you should see “DTCS IN VEHICLE” message.
Use READ button to browse through the hidden menu.
Modules will be listed with information about present DTCS:
DTC SET – errors found in module
CHECKING – waiting for information from module
READY – no errors
Volvo hidden menu modules list (all models)
ABS – Anti-Lock Brake System
ADM – Additive Dosing Module
AEM – Accesory Electronic Module
AFM – AM/FM Tuner Module
ATM – Antenna Module
AUD – Audio Module
AUM – Audio Module
BCM – Brake Control Module
CCM – Climate Control Module
CEM – Central Electronic Module
CPM – Combustion Preheater Module
DDM – Driver Door Module
DEM – Differential Electronic Module
DIM – Driver Information Module
ECM – Engine Control Module
EPS – Electrical Power Steering Module
ETM – Electronic Throttle Module
IAM – Integrated Audio Module
ICM – Information Control Module
KVM – Keyless Vehicle Module
LPG – LPG Module
LSM – Light Swith Module
MMM – Multimedia Module
MPM – Media Player Module
PAM – Parking Assistance Module
PDM – Passenger Door Module
PHM – Phone Module
PSL – Power Seat Left
PSR – Power Seat Right
REM – Rear Electronics Module
RTI – Road Traffic Information Module
SAS – Steering Wheel Angle Sensor
SHM – Seat Heating Module
SRM – Sunroof Module
SRS – Supplemental Restraint System
SUB – Subwoofer Module
SUM – Suspension Module
SWM – Steering Wheel Module
TCM – TransmissionMessage Channel Module
TMC – Traffic Message Channel Module
TRM – Trailer Module
UEM – Upper Electronic Module
WMM – Wiper Motor Module

[Alycidon]

Did the above method and didn't show any codes.
Got a PM suggesting to hold the read button and trip reset for 10 seconds did this a bleep occurred and code 052 appeared. Looked this up and showed a alarm fault. So after further tinkering it turns out to a defective siren unit which by all accounts is a common problem on older cars. Siren kit duly ordered.

So the only reason I can think that the "Alarm Service Required" is not displayed is that it has somehow been mapped out, I'd also previously found that the triangle amber and red warning lights were not working, this was due to a a piece of cut foam being put over the lights in the instrument housing ! No doubt by a previous owner when selling !!