DSC HU/Cm Inspection: Notes

Disconnect the DSC HU/CM connector. (See DSC HU/CM REMOVAL/INSTALLATION .)
Connect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [13B-MSP] .)
Attach the tester lead to the DSC HU/CM harness side connector, then inspect voltage, continuity or resistance according to the standard (reference value) in TERMINALS REFERENCE .
Standard (Reference Value)

Fig 1: Identifying DSC HU/CM Connector Terminals

Courtesy of MAZDA MOTORS CORP.

TERMINALS REFERENCE

Terminal	Signal name	Connected to	Measured item	Measured terminal (measured condition)	Standard	Inspection item(s)
A	Ground (ABS motor)	Ground point	Continuity	A-ground point	Continuity detected	Wiring harness (A- ground point)
B	Power supply (ABS motor operation)	Battery	Voltage	Under any condition	B+	Wiring harness (B- battery)
C	Power supply (solenoid operation)	Battery	Voltage	Under any condition	B+	Wiring harness (C- battery)
D	Ground (DSC system)	Ground point	Continuity	D-ground point	Continuity detected	Wiring harness (D- ground point)
E	LF wheel-speed sensor (ground)	LF ABS wheel-speed sensor	Continuity	E-LF ABS wheel-speed sensor connector terminal B	Continuity detected	Wiring harness (E-LF ABS wheel-speed sensor connector terminal B)
F	LF wheel-speed sensor (single)	LF ABS wheel-speed sensor	Continuity	F-LF ABS wheel-speed sensor connector terminal A	Continuity detected	Wiring harness (F-LF ABS wheel-speed sensor connector terminal A)
G	LR wheel-speed sensor (signal)	LR ABS wheel-speed sensor	Continuity	G-LR ABS wheel-speed sensor connector terminal B	Continuity detected	Wiring harness (G-LR ABS wheel-speed sensor connector terminal B)
H	LR wheel-speed sensor (ground)	LR ABS wheel-speed sensor	Continuity	H-LR ABS wheel-speed sensor connector terminal A	Continuity detected	Wiring harness (H-LR ABS wheel-speed sensor connector terminal A)
1	RR wheel-speed (signal)	RR ABS wheel-speed sensor	Continuity	1-RR ABS wheel-speed sensor connector terminal B	Continuity detected	Wiring harness (I-RR ABS wheel-speed sensor connector terminal B)
J	Power supply (system)	Ignition switch	Voltage	Ignition switch at ON	B+	Wiring harness (J- ignition switch)
J	Power supply (system)	Ignition switch	Voltage	Ignition switch is off.	1 V or less	-
K	-	-	-	-	-	-
L	RR wheel-speed sensor (ground)	RR ABS wheel-speed sensor	Continuity	L-RR ABS wheel-speed sensor connector terminal A	Continuity detected	Wiring harness (L-RR ABS wheel-speed sensor connector terminal A)
M	RF wheel-speed sensor (signal)	RF ABS wheel-speed sensor	Continuity	M-RF ABS wheel-speed sensor connector terminal A	Continuity detected	Wiring harness (M-RF ABS wheel-speed sensor connector terminal A)
N	Brake switch	Brake switch	Voltage	N-ground point (Brake pedal depressed)	B+	Wiring harness (N- brake switch) Brake switch
N	Brake switch	Brake switch	Voltage	N-ground point (Brake pedal not depressed)	1 V or less	-
O	RF wheel-speed sensor (ground)	RF ABS wheel-speed sensor	Continuity	O-RF ABS wheel-speed sensor connector terminal B	Continuity detected	Wiring harness (0-RF ABS wheel-speed sensor connector terminal B)
P	DSC OFF switch	DSC OFF switch	Continuity	P-DSC OFF switch connector terminal C	Continuity detected	Wiring harness (P- DSC OFF switch connector terminal C)
Q	KLN	DLC-2 (KLN)	Continuity	Q-DLC-2 terminal KLN	Continuity detected	Wiring harness (Q- DLC-2 terminal KLN)
R	-	-	-	-	-	-
S	-	-	-	-	-	-
T	Vehicle speed output	Audio unit	Continuity	T-audio unit	Continuity detected	Wiring harness (T- audio unit)
		Car-navigation unit		T-car-navigation unit		Wiring harness (T-car-navigation unit)
		Position memory control module		T-position memory control module		Wiring harness (T- position memory control module)
		Auto light/wiper control module		T-auto light/wiper control module		Wiring harness (T-auto light/wiper control module)
		Climate control unit		T-climate control unit		Wiring harness (T- climate control unit)
		Auto leveling control module		T-auto leveling control module		Wiring harness (T-auto leveling control module)
U	-	-	-	-	-	-
V	-	-	-	-	-	-
W	CAN_L	DLC-2 (CAN_L)	Continuity	W-DLC-2 terminal CAN_L	Continuity detected	Wiring harness (W- DLC-2 terminal CAN_L)
X	CAN_H	DLC-2 (CAN_H)	Continuity	X-DLC-2 terminal CAN_H	Continuity detected	Wiring harness (X- DLC-2 terminal CAN_H)
Y	-	-	-	-	-	-
Z	-	-	-	-	-	-
AA	-	-	-	-	-	-
AB	-	-	-	-	-	-
AC	-	-	-	-	-	-
AD	-	-	-	-	-	-
AE	-	-	-	-	-	-
AF	-	-	-	-	-	-
AG	-	-	-	-	-	-
AH	-	-	-	-	-	-
Al	-	-	-	-	-	-
AJ	-	-	-	-	-	-
AK	-	-	-	-	-	-
AL	-	-	-	-	-	-
AM	-	-	-	-	-	-
AN	-	-	-	-	-	-
AO	-	-	-	-	-	-
AP	-	-	-	-	-	-
AQ	-	-	-	-	-	-
AR	CAN2_H	Combined sensor	Continuity	AR-combined sensor connector terminal C	Continuity detected	Wiring harness (AR- combined sensor connector terminal C)
AS	CAN2_L	Combined sensor	Continuity	AS-combined sensor connector terminal B	Continuity detected	Wiring harness (AS- combined sensor connector terminal B)
AT	-	-	-	-	-	-