Former De Zalze Estate security supervisor Edgar Wyngaard says he drove past the van Breda home several times on the night of the axe murders and noticed nothing untoward.
Wyngaard used to work for Thorburn security and was on duty as a shift manager, patrolling the estate on the night of the attack.
Henri van Breda is on trial for allegedly killing his parents and older brother at their home outside Stellenbosch in January 2015.
The triple murder accused pleaded not guilty to all five charges against him.
Wyngaard claims he drove past the De Zalze home at least seven times that night but reiterated that did not see or hear anything unusual, reports EWN's Monique Mortlock.
On Wednesday, the defence highlighted several security breaches which occurred at the luxury Stellenbosch estate, cross-examining former De Zalze security guard Lorenzo Afrika.
Wyngaard insists that it would not have been possible for a intruder to climb over the electric fencing without being alerted.
Had someone climbed over the fencing, he advised that a silent 'anti-tampering' alarm would have gone off in the control room.
Defence lawyer Advocate Matthys Combrinck has read out a report alleging that three alarms were activated on the night of the attack.
However, Wyngaard says he also checked CCTV cameras and walked around the estate's parameters and was not aware of any alarms going off.
He explained in great detail the comprehensive security measures in place for both residents and visitors at the estate.
Court proceedings will resume on Monday.
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