1. Remove the fuse box cover. (See RELAY AND FUSE BLOCK REMOVAL/INSTALLATION.)
2. Remove the front body control module (FBCM) from the fuse box. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)
3. Verify that the voltages of each of the terminals are as indicated in the Terminal Voltage Table (Reference).
If the voltage is not as indicated in the table, inspect the parts under Inspection item(s).
If the system does not launch normally even though inspection items are normal, specify the location of the malfunction based on the instructions from the on-board diagnostic system and the symptom troubleshooting, and perform repairs.
| Terminal | Signal | Connected to | Measurement conditions | Voltage (V) | Inspection item(s) |
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| 1A | Power supply | HAZARD 25 A fuse | Under any condition | B+ |
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| 1B | Power supply | HAZARD 25 A fuse | Under any condition | B+ |
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| 1C | Ignition power supply |
| Ignition switched ON (engine off) | B+ |
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| Ignition switched OFF (LOCK) | 1.0 or less |
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| 1D | Signal ground | Body ground | Under any condition | 1.0 or less |
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| 1E | Rear turn light (RH) control | Rear turn light (RH) | Ignition switched ON (engine off) | Turn switch at right turn light position | 1.0 or less ⇔ B+ |
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| Turn switch is in position other than above | 1.0 or less |
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| 1F | Side turn light (RH) control | Side turn light (RH) | Ignition switched ON (engine off) | Turn switch at right turn light position | 1.0 or less ⇔ B+ |
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| Turn switch is in position other than above | 1.0 or less |
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| 1G | Front turn light (RH) control | Front turn light (RH) | Ignition switched ON (engine off) | Turn switch at right turn light position | 1.0 or less ⇔ B+ |
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| Turn switch is in position other than above | 1.0 or less |
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| 1H | — | — | — | — | — |
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| 1I | License light control | TNS relay | Light switch at TNS position | B+ |
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| Light switch at OFF position | 1.0 or less |
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| 1J | Parking light control | Parking light (LH, RH) | Light switch at TNS position | B+ |
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| Light switch at OFF position | 1.0 or less |
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| 1K | — | — | — | — | — |
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| 1L | Horn relay control | Horn relay | Horn switch not pressed | B+ |
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| Horn switch pressed | 1.0 or less |
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| 1M | Headlight relay (LO) control |
| Light switch at HEAD position | 1.0 or less |
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| Light switch is in position other than above | B+ |
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| 1N | — | — | — | — | — |
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| 1O*1 | Theft-deterrent horn input signal | Rear body control module (RBCM) | M-MDS is connected and theft-deterrent is sounded using data monitor function | 1.0 or less |
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| M-MDS is connected and theft-deterrent is not sounded using data monitor function | B+ |
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| 1P | Rear window defroster relay control | Rear window defroster relay | Ignition switched ON (engine off) | Rear window defroster switch OFF | B+ |
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| Rear window defroster switch ON | 1.0 or less |
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| 1Q | — | — | — | — | — |
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| 1R*1 | Theft-deterrent horn power supply | R.WIPER 15 A fuse | Under any condition | B+ |
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| 1S | — | — | — | — | — |
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| 1T*1 | Theft-deterrent horn output signal | Theft-deterrent horn | M-MDS is connected and theft-deterrent is sounded using data monitor function | B+ |
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| M-MDS is connected and theft-deterrent is not sounded using data monitor function | 1.0 or less |
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| 2A | Interior light power supply | ROOM 15 A fuse | Under any condition | B+ |
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| 2B | Front turn light (LH) control | Front turn light (LH) | Ignition switched ON (engine off) | Turn switch at left turn light position | 1.0 or less ⇔ B+ |
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| Turn switch is in position other than above | 1.0 or less |
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| 2C*2 | Daytime running light control |
| Ignition switched ON (engine off) and light switch OFF | Daytime running light illuminates | B+ |
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| Daytime running light turns off | 1.0 or less |
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| 2D | Rear turn light (LH) control | Rear turn light (LH) | Ignition switched ON (engine off) | Turn switch at left turn light position | 1.0 or less ⇔ B+ |
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| Turn switch is in position other than above | 1.0 or less |
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| 2E | LIN communication | Current sensor | Terminal used for communication therefore determination based on terminal voltage is not possible. |
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| 2F | Side turn light (LH) control | Side turn light (LH) | Ignition switched ON (engine off) | Turn switch at left turn light position | 1.0 or less ⇔ B+ |
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| Turn switch is in position other than above | 1.0 or less |
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| 2G*3 | LIN communication | Auto-light sensor/rain sensor | Terminal used for communication therefore determination based on terminal voltage is not possible. |
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| 2H | — | — | — | — | — |
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| 2I | CAN_L | CAN system related module | Terminal used for communication therefore determination based on terminal voltage is not possible. |
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| 2J | — | — | — | — | — |
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| 2K | CAN_H | CAN system related module | Terminal used for communication therefore determination based on terminal voltage is not possible. |
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| 2L | CAN_L | CAN system related module | Terminal used for communication therefore determination based on terminal voltage is not possible. |
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| 2M | Ignition power supply | C/U IG1 15 A fuse | Ignition switched ON (engine off) | B+ |
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| Ignition switched OFF (LOCK) | 1.0 or less |
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| 2N | CAN_L | CAN system related module | Terminal used for communication therefore determination based on terminal voltage is not possible. |
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| 2O | — | — | — | — | — |
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| 2P | CAN_H | CAN system related module | Terminal used for communication therefore determination based on terminal voltage is not possible. |
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| 2Q | Brake fluid level switch signal | Brake fluid level sensor | Ignition switched ON (engine off) | Brake fluid level is less than MIN (brake fluid level sensor ON) | 1.0 or less |
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| Brake fluid level is MIN or more (brake fluid level sensor OFF) | Wave pattern (See Pattern 1.) |
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| 2R | CAN_H | CAN system related module | Terminal used for communication therefore determination based on terminal voltage is not possible. |
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| 2S | Washer level switch signal | Washer fluid-level sensor | Ignition switched ON (engine off) | Washer level is less than MIN (washer fluid-level sensor ON) | 1.0 or less |
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| Washer level is MIN or more (washer fluid-level sensor OFF) | Wave pattern (See Pattern 1.) |
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| 2T | — | — | — | — | — |
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| 2U | Ignition power supply | Start stop unit | Ignition switched ON (engine off) | B+ |
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| Ignition switched OFF (LOCK) | 1.0 or less |
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| 2V | Headlight relay (LO) control (discharge type) | Headlight LO relay (RH) | Light switch at HEAD position | 1.0 or less |
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| Light switch is in position other than above | B+ |
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| 2W | Headlight (LO) switch signal | Start stop unit | Light switch at HEAD position | 1.0 or less |
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| Light switch at OFF position | B+ |
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| 2X | Headlight relay (HI) control | Headlight HI relay | Headlight at HEAD position and dimmer switch at LO position | B+ |
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| Headlight at HEAD position and dimmer switch at HIGH or passing position | 1.0 or less |
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| 2Y | Windshield wiper (LO) switch signal | Start stop unit | Windshield wiper switch at ON position | 1.0 or less |
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| Windshield wiper switch at OFF position | B+ |
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| 2Z | Blower motor relay control | Blower relay | Ignition switched ON (engine off) | Operate blower motor using fan switch | 1.0 or less |
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| Press climate control unit OFF button to stop blower motor | B+ |
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| 2AA | Autostop switch signal | Windshield wiper motor | Ignition switched ON (engine off) | Turn windshield wiper switch ON and wiper is operated | B+ |
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| Windshield wiper switch OFF | 1.0 or less |
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| 2AB*4 | Front fog light relay control | Front fog light relay | Light switch at HEAD position | Front fog light switch OFF | B+ |
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| Front fog light switch ON | 1.0 or less |
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| 3A | Wiper power supply | WIPER 20 A fuse | Under any condition | B+ |
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| 3B | Wiper power supply | WIPER 20 A fuse | Under any condition | B+ |
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| 3C | Windshield wiper motor (HI) control | Windshield wiper motor | Ignition switched ON (engine off) | Windshield wiper switch at HI position | B+ |
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| Windshield wiper switch at OFF position | 1.0 or less |
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| 3D | Power ground | Body ground | Under any condition | 1.0 or less |
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| 3E | Windshield wiper motor (HI) control | Windshield wiper motor | Ignition switched ON (engine off) | Windshield wiper switch at HI position | B+ |
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| Windshield wiper switch at OFF position | 1.0 or less |
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| 3F | Windshield washer motor control | Washer motor | Ignition switched ON (engine off) | Windshield washer switch ON | B+ |
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| Windshield washer switch OFF | 1.0 or less |
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| 3G | Windshield wiper motor (LOW) control | Windshield wiper motor | Ignition switched ON (engine off) | Windshield wiper switch at LOW position | B+ |
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| Windshield wiper switch at OFF position | 1.0 or less |
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| 3H | — | — | — | — | — |
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| 3I | Windshield wiper motor (LOW) control | Windshield wiper motor | Ignition switched ON (engine off) | Windshield wiper switch at LOW position | B+ |
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| Windshield wiper switch at OFF position | 1.0 or less |
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| 3J | Interior illumination power supply |
| Light switch at TNS position | B+ |
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| Light switch at OFF position | —*5 |
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| 3K | Power supply | HAZARD 25 A fuse | Under any condition | B+ |
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| 3L | Power supply | HAZARD 25 A fuse | Under any condition | B+ |
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Terminal:
Brake fluid level signal: 2Q (+) ⇔ ground (-)
Washer level signal: 2S (+) ⇔ ground (-)
Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range