DTC Troubleshooting: 31

LKAS Control Unit DTC 31: System Structure Error NOTE: The adaptive cruise control (ACC)/LKAS system malfunction is detected when the control unit of different specification is installed at the following units replacing.

- LKAS control unit
- Adaptive cruise control (ACC) unit
- EPS (LKAS) control unit
- LKAS camera

1. Clear the DTCs with the HDS.

1. Turn the ignition switch ON (II).

1. Select ‘‘LKAS'' on the HDS, and check the ECU ID No. 5 from the data list.

Is ‘‘01'' indicated?

YES | - | The LKAS control unit is matcing the specification. Go to Step 4 .
NO | - | The LKAS control unit is different specification, check the part number and replace the LKAS control unit with the correct specification one. ■

1. Select ‘‘ACC'' on the HDS, and check the ECU ID No. 3 from the data list.

Is ‘‘04'' indicated?

YES | - | The adaptive cruise control (ACC) unit is matcing the specification. Go to Step 5 .
NO | - |

- The adaptive cruise control (ACC) unit is different in the specification, check the part number and replace the adaptive cruise control (ACC) unit with the correct specification one.
- After the replacement, do the adaptive cruise control (ACC) unit initialization (DTC 100).■

1. Select ‘‘ACC'' on the HDS, and check the ECU ID No. 7 from the data list.

Is ‘‘01'' indicated?

YES | - | The adaptive cruise control (ACC) unit is matcing the specification. Go to Step 6 .
NO | - |

- The adaptive cruise control (ACC) unit is different in the specification, check the part number and replace the adaptive cruise control (ACC) unit with the correct specification one.
- After the replacement, do the adaptive cruise control (ACC) unit initialization (DTC 100).■

1. Select ‘‘EPS'' on the HDS, and check the ECU ID No. 5 from the data list.

Is ‘‘64'' indicated?

YES | - | The EPS (LKAS) control unit is matcing the specification. Go to Step 7 .
NO | - | The EPS (LKAS) control unit is different specification, check the part number and replace the EPS (LKAS) control unit with the correct specification one. ■

1. Select ‘‘LKAS Camera'' on the HDS, and check the ECU ID No. 1 from the data list.

Is ‘‘01'' indicated?

YES | - | The LKAS camera is matcing the specification. Go to Step 8 .
NO | - |

- The LKAS camera is different in the specification, check the part number and replace the LKAS camera with the correct specification one.
- After the replacement, do the LKAS camera adjustment (aiming). ■

1. Select ‘‘LKAS Camera'' on the HDS, and check the ECU ID No. 5 from the data list.

Is ‘‘02'' indicated?

YES | - | The LKAS camera is matcing the specification.■
NO | - |

- The LKAS camera is different in the specification, check the part number and replace the LKAS camera with the correct specification one.
- After the replacement, do the LKAS camera adjustment (aiming). ■