All values measured to ground unless otherwise noted
Conn./Plug/Pin	Pin Information	Test Value	Comments
N48
1.1 1.2	Membrane travel sensor voltage supply output high side voltage supply output low side (ground)	Ignition on 4.75 - 5.25 VDC Ignition on 12 VDC, to circuit 30 pin 3.4
1.3	pin not used
1.4	Membrane travel sensor signal input detects emergency brake situation and initialises BAS function	Ignition on brake not applied < 1 VDC, applied 5 VDC
2.1 2.2	Brake release switch normally open signal normally closed signal	Ignition on brake applied < 1 VDC, not applied 12 VDC brake not applied < 1 VDC, applied 12 VDC
2.3	BAS solenoid valve activation signal output activated from sensor A7/7b1 output signal	Ignition off ECM disconnected measure to pin 2.5 < 5 Ohms
2.4	pin not used
2.5	Brake release switch voltage supply output	Ignition on 12 VDC
2.6	BAS solenoid valve power supply output	Ignition on 4 - 5.5 VDC
3.1	Main ground to W16/3	Approx. 0 Ohms to ground or measure to circuit 30 12 VDC
3.2	CAN-Bus (high side). High speed data transfer bus input and output, shares data with other ECMs	No reliable test. Check continuity to other ECMs approx. 5 VAC when data is on bus.
3.3	Circuit 87 ASR fused power input from BM	Ignition on 12 VDC	Feed from Z7/36
3.4	Circuit 30 main power input	12 VDC at all times	Feed from Z7/36
3.5	CAN-Bus (low side). high speed data transfer bus input and output, shares data with other ECMs	same as pin 3.2
3.6	"Diagnostic port" for DTC readout and diagnostic purpose	Ignition on 1 - 2 VDC	To be tested with HHT refer to D.M.