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Aims: This work is the first stage of a campaign to search for IMBHs, in lowluminosity AGN (LLAGN) and dwarf galaxies. An additional, and equallyimportant, aim of this pilot study is to investigate the consistency betweenthe predictions of several BH scaling relations and the fundamental plane ofblack hole activity (FP-BH). Methods: We use X-ray and radio luminosityrelations in accreting BHs, along with the latest scaling relations between themass of the central black hole (MBH) and the properties of its host spheroid,to predict MBH in seven LLAGN, that were previously reported to be in the IMBHregime. Namely, we use the recently re-evaluated MBH - Msph (Msph : spheroidabsolute magnitude at 3.6 microm) scaling relation for spiral galaxies, the MBH- nsph (nsph : major axis Sersic index of the bulge) relation, the MBH - PA(PA: pitch angle) relation and the FP-BH for weakly accreting BHs, toindependently estimate MBH in all seven galaxies. Results: We find that allLLAGN in our list have low-mass central black holes - with log MBH/Msol~6.5 onaverage - but they are, not IMBHs. All 4 methods used predicted consistent BHmasses, in the 1sigma range. Furthermore, we report that, in contrast toprevious classification, galaxy NGC 4470 is bulge-less, and cast doubts on theAGN classification of NGC 3507. Conclusions: We find that our latest,state-of-the-art techniques for bulge magnitude & Sersic index computations andthe most recent updates of the MBH - Lsph, MBH - nsph , MBH - PA relations andthe FP-BH produce consistent results in the low mass regime. We establish amultiple method approach for predicting BH masses in the regime where theirspheres-of- grav. influence cannot be spatially resolved. Our approachmitigates against outliers from any one relation and provides a more robustaverage prediction. We will use our new method to revisit more IMBH candidatesin LLAGN

Searching for Intermediate Mass Black Holes in galaxies with Low Luminosity AGN: A multiple-method approach