After visit to SC, they informed me issue due to flow of power.  I had installed alarm/central lock/dashcam and apparently wiring to the ECU is the cause.

After dismantling all three, issue persists and they directed me to Sanden.

Sanden found no issue with my EC, suggested I return to SC.  They also informed me that because there was wiring to ECU, warranty for aircond apparently voided.

Checked with the accesories vendor, supposedly he's done plenty of similar installations without any issue, accessories just draw power.

Would installing the aforementioned accessories possibly cause damage, or is this just something 'irregular' that the SC is claiming to void warranty?  No one seems to have identified the issue yet, just dismissed the power irregularity as the cause, but issue persists even after disconnecting the accessories.

Would installing those accessories, with wiring to the ECU void my warranty?  If so, to what extent?  Just the aircond, or everything else?  Also planning to get clarification during next SC visit.

I just find it strange that the basic accessories I installed could potentially be the cause of this issue, or void my warranty.  Where else would accessories draw power from?  The car even comes with an antenna, with expectation that buyers would install their own radio accessory...  I'm not even installing anything fancy, just basics like alarm/central lock.  Even police don't take you seriously these days without dashcam, and news recently reported JPJ contemplating making dashcams compulsory...

Appreciate feedback on this, thanks.