Hands-Free Speakers (For Keypad Unit / CARPHONE Module (PHM))

Fig 1: Identifying Engine Control Module

Courtesy of VOLVO CARS CORPORATION

Before measuring, read, see CONNECTING THE BREAKOUT BOX AND CHECKING THE GROUND TERMINAL .

Pin no.	Signal type	Ignition on	Other
F1	Signal (+) hands-free	Alternating current (to #2) when there is sound from the speakers	-
F2	Signal (-) hands-free	Alternating current (to #1) when there is sound from the speakers	-