1. Disconnect the DSC HU/CM connector. (See DSC HU/CM REMOVAL/INSTALLATION.)
2. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)
3. Attach the tester lead to the DSC HU/CM wiring harness-side connector and inspect the voltage, continuity, or resistance according to the standard (reference) on the table.
| Terminal | Signal name | Connected to | Measured item | Measured terminal (measurement condition) | Standard | Inspection item(s) |
| A | Ground (system) | Ground point | Continuity | A—ground point | Continuity detected |
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| B | Ground (pump motor) | Ground point | Continuity | B—ground point | Continuity detected |
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| C | Brake light (vehicles with Mazda Radar Cruise Control (MRCC) system or Smart City Brake Support (SCBS)) | Brake light relay*1 or brake light unit*2*3 | Voltage | Brake pedal depressed | B+ |
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| Brake pedal not depressed | 1 V or less |
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| D | 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. |
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| E | 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. |
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| F | CAN2_L | SAS control module | This terminal is used for communication and cannot be used for malfunction determination during terminal voltage inspection. Perform a DTC inspection. |
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| G | CAN2_H | SAS control module | This terminal is used for communication and cannot be used for malfunction determination during terminal voltage inspection. Perform a DTC inspection. |
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| H | — | — | — | — | — | — |
| I | LR wheel-speed sensor (-) | LR ABS wheel-speed sensor | Continuity | I—LR ABS wheel-speed sensor terminal B | Continuity detected |
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| J | RR wheel-speed sensor (-) | RR ABS wheel-speed sensor | Continuity | J—RR ABS wheel-speed sensor terminal B | Continuity detected |
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| K | — | — | — | — | — | — |
| L | LR wheel-speed sensor (+) | LR ABS wheel-speed sensor | Continuity | L—LR ABS wheel-speed sensor terminal A | Continuity detected |
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| M | RR wheel-speed sensor (+) | RR ABS wheel-speed sensor | Continuity | M—RR ABS wheel-speed sensor terminal A | Continuity detected |
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| N | — | — | — | — | — | — |
| O | RF wheel-speed sensor (-) | RF ABS wheel-speed sensor | Continuity | O—RF ABS wheel-speed sensor terminal B | Continuity detected |
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| P | LF wheel-speed sensor (-) | LF ABS wheel-speed sensor | Continuity | P—LF ABS wheel-speed sensor terminal B | Continuity detected |
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| Q | — | — | — | — | — | — |
| R | RF wheel-speed sensor (+) | RF ABS wheel-speed sensor | Continuity | R—RF ABS wheel-speed sensor terminal A | Continuity detected |
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| S | LF wheel-speed sensor (+) | LF ABS wheel-speed sensor | Continuity | S—LF ABS wheel-speed sensor terminal A | Continuity detected |
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| T | — | — | — | — | — | — |
| U | — | — | — | — | — | — |
| V | — | — | — | — | — | — |
| W | — | — | — | — | — | — |
| X | — | — | — | — | — | — |
| Y | — | — | — | — | — | — |
| Z | — | — | — | — | — | — |
| AA | — | — | — | — | — | — |
| AB | — | — | — | — | — | — |
| AC | — | — | — | — | — | — |
| AD | — | — | — | — | — | — |
| AE | — | — | — | — | — | — |
| AF | Power supply (system) | IG1 relay | Voltage | Ignition switched ON (engine off). | B+ |
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| Switch the ignition off. | 1 V or less |
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| AG | Power supply (solenoid operation) | Battery | Voltage | Under any condition | B+ |
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| AH | Power supply (pump motor operation) | Battery | Voltage | Under any condition | B+ |
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