Self-Diagnostic Function
NOTE:
Some models have the rear outer handle touch sensor. Perform the troubleshooting flow where applicable.
The keyless access system has a self-diagnostic function. If any malfunction and DTC are stored in the keyless access/TPMS control unit, the keyless access indicator flashes.
When malfunction is detected, the keyless access indicator flashes until the vehicle is turned to OFF (LOCK) mode.
The DTC is cleared when the battery terminal is disconnected, or by removing the No. C16 (10 A) fuse from the under-hood fuse/relay box.
| DTC | Keyless access indicator | Description |
|---|---|---|
| B1601 | ◦ | Keyless Access Control Unit internal (CPU) error |
| B1602 | ◦ | Keyless Access Control Unit internal (EEPROM) error |
| B12A1 | ◦ | Power Control Unit Internal (CPU) Erorr |
| B12C5 | ◦ | Engine start/stop switch failure |
| B12C6 - Refer to: DTC Troubleshooting: B12C6 (2017 2018 2019 2020), or DTC Troubleshooting: B12C6 | ◦ | Electric steering lock switch C/D monitor circuit failure |
| B12C7 - Refer to: DTC Troubleshooting: B12C7 (2017 2018 2019 2020), or DTC Troubleshooting: B12C7(With Electric Steering Lock) (2016), or DTC Troubleshooting: B12C7 (2014 2015) | ◦ | Electric steering lock motor circuit failure |
| B1627 - Refer to: DTC Troubleshooting: B1627, or DTC Troubleshooting: B1627 (2017 2018 2019 2020) | ◦ | RF1 Unit disconnected (2-way transceiver or RF antenna disconnected) |
| B1632 | ◦ | MTR CONT signal error |
| B12D0 | ◦ | Power control unit IG1A circuit error |
| B12D1 | ◦ | Power control unit IG1B circuit error |
| B12D2 | ◦ | Power control unit IG2 circuit error |
| B12D3 | ◦ | Power control unit IG latch circuit error |
| B1640 | ◦ | RF1 antenna not connected or malfunction (Internal RF antenna malfunction) |
| B1641 - Refer to: DTC Troubleshooting: B1641 (2017 2018 2019 2020), or DTC Troubleshooting: B1641 | ◦ | RF2 antenna not connected or malfunction (2-way transceiver or RF antenna not connected or malfunction) |
| B1645 | ◦ | Driver's Door LF Antenna circuit short (Left-Front LF Antenna circuit short) |
| B1646 | ◦ | Driver's Door LF Antenna circuit open (Left-Front LF Antenna circuit open) |
| B1647 | ◦ | Passenger's Door LF Antenna circuit short (Right-Front LF Antenna circuit short) |
| B1648 | ◦ | Passenger's Door LF Antenna circuit open (Right-Front LF Antenna circuit open) |
| B1649 | ◦ | Driver Side Rear Passenger Door Antenna circuit short (Left-Rear LF Antenna circuit short) |
| B1650 | ◦ | Driver Side Rear Passenger Door Antenna circuit open (Left-Rear LF Antenna circuit open) |
| B1651 | ◦ | Passenger side rear passenger door antenna circuit short (Right-Rear LF Antenna circuit short) |
| B1652 | ◦ | Passenger side rear passenger door antenna circuit open (Right-Rear LF Antenna circuit open) |
| B1659 | ◦ | Front Interior LF Antenna circuit short |
| B1660 | ◦ | Front Interior LF Antenna circuit open |
| B1663 - Refer to: DTC Troubleshooting: B1663 (2017 2018 2019 2020), or DTC Troubleshooting: B1663 | ◦ | Rear Interior LF Antenna circuit short |
| B1664 - Refer to: DTC Troubleshooting: B1664, or DTC Troubleshooting: B1664 (2017 2018 2019 2020) | ◦ | Rear Interior LF Antenna circuit open |
| B12E0 | ◦ | Electric steering lock switch internal error |
| B12E1 - Refer to: DTC Troubleshooting: B12E1(With Electric Steering Lock) (2016), or DTC Troubleshooting: B12E1 (2017 2018 2019 2020), or DTC Troubleshooting: B12E1 (2014 2015) | ◦ | Electric steering lock motor internal error |
| B12E2 - Refer to: DTC Troubleshooting: B12E2(With Electric Steering Lock) (2016), or DTC Troubleshooting: B12E2 (2014 2015), or DTC Troubleshooting: B12E2 (2017 2018 2019 2020) | ◦ | Electric steering lock low level failure of MTRCUT1 |
| DTC | Keyless access indicator | Description |
|---|---|---|
| B12E3 - Refer to: DTC Troubleshooting: B12E3, or DTC Troubleshooting: B12E3 (2017 2018 2019 2020) | ◦ | Electric steering lock high level failure of MTRCUT1 |
| B12E4 - Refer to: DTC Troubleshooting: B12E4 (2014 2015), or DTC Troubleshooting: B12E4(With Electric Steering Lock) (2016) | ◦ | Electric steering lock high level failure of MTRCUT2 |
| B12E5 | ◦ | Incorrect assembly of control unit for electric steering lock equipped vehicle |
| B12F0 | ◦ | Power control unit lost communication with electric steering lock |
| B12F3 | ◦ | Power control unit lost communication with transmission control unit |
| B1926 | ◦ | Backup Control Antenna Open or Short |
| B1931 | ◦ | Backup Control Unit No Response |
NOTE:
When the engine start/stop button is pressed and the mode changes to ON, the keyless access indicator comes on when any malfunction is detected.