All values measured to ground unless otherwise noted
Conn./Plug/Pin	Pin Information	Test Value	Comments
A37
1.8	CAN Class B bus (high side). Mid speed data transfer bus input and output, exchanges data with other ECMs	No reliable test. Check continuity of wiring. Approx. 5 VAC when data is on bus	HHT is also used for CAN diagnosis
1.9	CAN Class B bus (low side)	See pin 1.8
2.2	Circuit 30 fused power input	12 VDC at all times	Feed from F4f4
2.3	Main ground to W7	Approx. 0 Ohms to ground
2.4	Circuit 30 fused power input	12 VDC at all times	Feed from F4f2
3.4	ATA tow sensor signal input	> 2 VDC static value Voltage varies when vehicle is moved
3.11	ATA/CL signal output	12 VDC when ATA/CL activated	Internally linked to CAN, activated by S6/1s2 via N10/1
3.15	ATA tow sensor ground signal input	No reliable test