DSC HU/Control Module Inspection

Disconnect the DSC HU/CONTROL MODULE connector. (See DSC HU/CONTROL MODULE REMOVAL/INSTALLATION [VIN M] .) (See DSC HU/CONTROL MODULE REMOVAL/INSTALLATION [VIN Y] ).
Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION ).
Attach the tester lead to the DSC HU/CONTROL MODULE wiring harness-side connector and inspect voltage, continuity, or resistance according to the standard (reference) on the table.

Standard (Reference)

Courtesy of MAZDA MOTORS CORP.

TERMINAL AND SIGNAL NAME SPECIFICATION

Terminal	Signal name	Connected to	Measured item	Measured terminal (measurement condition)	Standard	Inspection item(s)
A	Power supply (solenoid operation)	Battery	Voltage	Under any condition	B+	Wiring harness (A- battery)
B	Power supply (motor operation)	Battery	Voltage	Under any condition	B+	Wiring harness (B- battery)
C	RF wheel-speed (-)	RF ABS wheel-speed sensor	Continuity	C-RF ABS wheel-speed sensor terminal B	Continuity detected	Wiring harness (C- RF ABS wheel-speed sensor terminal B)
D	-	-	-	-	-	-
E	-	-	-	-	-	-
F	RF wheel-speed (+)	RF ABS wheel-speed sensor	Continuity	F-RF ABS wheel-speed sensor terminal A	Continuity detected	Wiring harness (F- RF ABS wheel-speed sensor terminal A)
G	-	-	-	-	-	-
H	-	-	-	-	-	-
I	-	-	-	-	-	-
J	-	-	-	-	-	-
K	-	-	-	-	-	-
L	LR wheel-speed (+)	LR ABS wheel-speed sensor	Continuity	L-LR ABS wheel-speed sensor terminal B	Continuity detected	Wiring harness (L-LR ABS wheel-speed sensor terminal B)
M	-	-	-	-	-	-
N	-	-	-	-	-	-
O	LR wheel-speed (-)	LR wheel-speed sensor	Continuity	O-LR ABS wheel-speed sensor terminal D	Continuity detected	Wiring harness (O- LR ABS wheel-speed sensor terminal D)
P	-	-	-	-	-	-
Q	Power supply (system)	Ignition switch	Voltage	Ignition switched ON (engine off).	B+	Wiring harness (Q- ignition switch)
				Switch the ignition to off.	1 V or less
R	-	-	-	-	-	-
S	-	-	-	-	-	-
T	-	-	-	-	-	-
U	-	-	-	-	-	-
V	-	-	-	-	-	-
W	-	-	-	-	-	-
X	RR wheel-speed (-)	RR ABS wheel-speed sensor	Continuity	X-RR ABS wheel-speed sensor terminal D	Continuity detected	Wiring harness (X- RR ABS wheel-speed sensor terminal D)
Y	-	-	-	-	-	-
Z	-	-	-	-	-	-
AA	RR wheel-speed (+)	RR ABS wheel-speed sensor	Continuity	AA-RR ABS wheel-speed sensor terminal B	Continuity detected	Wiring harness (AA- RR ABS wheel-speed sensor terminal B)
AB	-	-	-	-	-	-
AC	CAN_L	CAN module	This terminal is used for communication and cannot be used for malfunction determination during terminal voltage inspection. Perform a DTC inspection.
AD	-	-	-	-	-	-
AE	-	-	-	-	-	-
AF	CAN_H	CAN module	This terminal is used for communication and cannot be used for malfunction determination during terminal voltage inspection. Perform a DTC inspection.
AG	LF wheel-speed sensor (+)	LF ABS wheel-speed sensor	Continuity	AG-LF ABS wheel-speed sensor terminal A	Continuity detected	Wiring harness (AG- LF ABS wheel-speed sensor terminal A)
AH	-	-	-	-	-	-
AI	Brake light	Brake light relay or brake light unit	Voltage	Brake pedal depressed	B+	Wiring harness (AI- brake light
				Brake pedal released	1 V or less	relay or brake light unit)
AJ	LF wheel-speed sensor (-)	LF wheel-speed sensor	Continuity	AJ-LF ABS wheel-speed sensor terminal B	Continuity detected	Wiring harness (AJ- LF ABS wheel-speed sensor terminal B)
AK	-	-	-	-	-	-
AL	Ground	Ground point	Continuity	AL-ground point	Continuity detected	Wiring harness (AL- ground point)