DSA signal description

Fig 1: DSA Control Module Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

All the values given below are between the terminal in column 1 and terminal 9 (ground), unless otherwise indicated in brackets.

DSA control module terminals 1 - 16 correspond to terminals 31 - 46 on the breakout box.

NOTE:

It is important to connect the breakout box and check the ground terminal before taking readings.

U =	DC voltage in volts (V)	f =	frequency in Hertz (Hz)
Ubat =	battery voltage	% duty =	duty cycle (pulse ratio) as a percentage (%)
Ulow =	voltage approximately 0 V

Terminal	Signal type	Ignition on	Engine idling	Other	Parameter read off
#1	Power supply (from the ignition switch)	Ubat		-
#2	Signal, wheel speed left front wheel (from the ABS control module)	U ≈ 0 V - Ubat depending on the position of the wheel. The frequency (f) increases with the speed of the wheel.		A pulsed signal (0 V - Ubat with a fixed pulse ratio (% duty ≈ 50 %).
#3	Signal, wheel speed right front wheel (from the ABS control module)	U ≈ 0 V - Ubat depending on the position of the wheel. The frequency (f) increases with the speed of the wheel.		A pulsed signal (0 V - Ubat with a fixed pulse ratio (% duty ≈ 50 %).
#4	Signal, wheel speed left rear wheel (from the ABS control module)	U ≈ 0 V - Ubat depending on the position of the wheel. The frequency (f) increases with the speed of the wheel.		A pulsed signal (0 V - Ubat with a fixed pulse ratio (% duty ≈ 50 %).
#5	Signal, throttle position (TP) sensor (from the engine control module (ECM))	% duty ≈ 15 % at closed throttle position (CTP) (idling). f ≈ 50 Hz		Pulsed signal (0 V - Ubat) with fixed frequency and variable pulse ratio (% duty). Pulse ratio (% duty) increases with increased throttle.	3
#6	Signal, DSA switch	Switch unaffected: U ≈ 0 - 3 V below Ubat Switch affected: U ≈Ulow		The signal is grounded when the switch is pressed.	8
#7	Signal, stop (brake) light switch	Open: U ≈ Ulow Closed: U = 0 - 1.5 V below Ubat		Stop (brake) light switch closes when braking and the control module receives a signal.	11
#8	-	-		-
#9	Ground (for FENIX 5.1 ground via the engine control module (ECM), measured at the battery negative terminal)	Ulow		-
#10	-	-		-
#11	-	-		-
#12	Signal, wheel speed right rear wheel (from the ABS control module)	U ≈ 0 V - Ubat depending on the position of the wheel. The frequency (f) increases with the speed of the wheel.		A pulsed signal (0 V - Ubat with a fixed pulse ratio (% duty ≈ 50 %).
#13	Signal, load (TQ) (from the engine control module (ECM))	U ≈Ulow	f ≈ 33 Hz	Pulsed signal (0 V - Ubat) with variable frequency and pulse ratio (% duty). The frequency increases with engine speed (RPM), the pulse ratio (% duty) increases with load.
#14	Diagnostic lead	U = 1 - 4 V below Ubat Other values apply if the fault-tracing instrument is connected to the data link connector (DLC).		-
#15	Signal, request for torque limiting (to the engine control module (ECM))	f ≈ 200 Hz		Pulsed signal (0 - 5 V) with fixed frequency and variable pulse ratio (% duty).
#16	Control signal, DSA warning lamp	Lamp lit: U = 0-0.5 V Lamp not lit: Ubat		-	9, 10