DSC HU/Cm Removal/Installation: Notes

Oil and Chemical Type

Brake fluid type
Type: SAE J1703 or FMVSS116 DOT-3

CAUTION:

When replacing the DSC HU/CM, perform the configuration to assure that the system operates correctly.
(Refer to [CONFIGURATION] in the service information)
The internal parts of the DSC HU/CM could be damaged if dropped. Be careful not to drop the DSC HU/CM.
Replace the DSC HU/CM if it is subjected to an impact.
Brake fluid will damage painted surfaces. Be careful not to spill any on painted surfaces. In addition, if there is any brake fluid on the wiring harness, the wire insulation may corrode causing a malfunction such as a short circuit. If brake fluid gets on a painted surface or wiring harness, wash and flush it off completely with water immediately.

NOTE:

The DSC HU/CM records the vehicle specification information and the electric parking brake operation/release condition.
Tighten the brake pipe flare nut using any commercially available flare nut wrench.

To replace the DSC HU/CM, perform the following procedure.
1. Front doors on both sides and trunk lid (4SD) or liftgate (5HB) are open.
Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the following parts:
1. Windshield wiper arm and blade (See WINDSHIELD WIPER ARM AND BLADE REMOVAL/INSTALLATION .)
2. Cowl grille (See COWL GRILLE REMOVAL/INSTALLATION .)
3. Windshield wiper motor and link (See WINDSHIELD WIPER MOTOR AND LINK REMOVAL/INSTALLATION .)
4. Side cowl grille (See COWL GRILLE REMOVAL/INSTALLATION .)
5. Cowl panel (See COWL PANEL REMOVAL/INSTALLATION .)
Remove the insulator. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION)] .)
(See EXHAUST SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)

Courtesy of MAZDA MOTORS CORP.
Remove in the order indicated in the table.
Install in the reverse order of removal.
After installation, add brake fluid, bleed the air, and inspect for fluid leakage. (See BRAKE FLUID AIR BLEEDING .)

If the DSC HU/CM is replaced, perform the following procedure.

Perform the DSC HU/CM configuration using the M-MDS. (Refer to [CONFIGURATION] in the service information)
Clear the DTC. (Refer to CLEARING DTC in the service information)
Perform the sensor initialization for the DSC-related parts. (See DSC RELATED PARTS SENSOR INITIALIZATION PROCEDURE .)
Check the related parts using the following procedure.
1. Operate the electric parking brake.
2. Release the electric parking brake.
3. Operate the electric parking brake.
4. Release the electric parking brake.
Clear the DTC. (Refer to CLEARING DTC in the service information)

Verify that the following warning/indicator lights turn off.

Brake control system warning light

Courtesy of MAZDA MOTORS CORP.

If the warning/indicator lights do not turn off, perform a DTC inspection. (Refer to DTC INSPECTION in the service information)

Operate the electric parking brake.
Verify that the electric parking brake indicator light turns on and the brake control system warning light turns off.
- If the electric parking brake indicator light does not turn on, the electric parking brake indicator light flashes, or the brake control system warning light does not turn off, perform a DTC inspection as a malfunction of the electric parking brake may have occurred. (Refer to DTC INSPECTION in the service information)

Step 1

Fig 1: DSC HU/CM Components Location With Torque Specifications (Step 1)

Courtesy of MAZDA MOTORS CORP.

COMPONENT OPERATIONS

Component no.	Refer to
1	DSC HU/CM connector (See dsc HU/CM Connector Removal Note .) (See DSC HU/CM Connector Installation Note .)
2	Brake pipe (See BRAKE PIPE REMOVAL NOTE .) (See BRAKE PIPE INSTALLATION NOTE .)
3	Nut (See NUTS INSTALLATION NOTE .)
4	DSC HU/CM component

Step 2

Fig 2: DSC HU/CM Components Location With Torque Specifications (Step 2)

Courtesy of MAZDA MOTORS CORP.

COMPONENT OPERATIONS