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ON-BOARD DIAGNOSYS SYSTEM OUTLINE [IMMOBILIZER SYSTEM (ADVANCED KEYLESS SYSTEM)]

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• The immobilizer system is provided with a malfunction diagnosis function.
• Malfunction diagnosis of the immobilizer system occurs automatically when the start knob is turned from the LOCK (ACC) to the ON (START) position.
• If the results of the malfunction diagnosis show a malfunction in the immobilizer system, the security light indicates a DTC. At the same time, DTCs are stored in the PCM and keyless control module. The stored DTCs can be verified using the WDS or equivalent.

  Caution

  • Always use the WDS or equivalent to verify DTCs even if the security light indicates a DTC. If the security light itself has a malfunction, it is possible that a DTC may not be indicated properly. There are certain DTCs which can only be verified using the WDS or equivalent, not the security light.

  Note

  • If two or more malfunctions are detected as a result of malfunction diagnosis, only the DTC with the lowest number of those detected will be indicated by the security light. The PCM and keyless control module store multiple DTCs at the same time.
  • If two or more immobilizer system DTCs are verified, first repair the part of the DTC indicated by the security light. After completely repairing one location, turn the ignition switch from the LOCK to the ON position and perform immobilizer system malfunction diagnosis.

## DTC table

  Note

  • In the approx. 1 min after detecting a malfunction and before indicating the DTC, the security light illuminates or flashes in the following patterns:

Security light flashing pattern (Before indicating a DTC) | DTC
--- | ---
| 11, 12, 13, 14, 15
| 21

DTC | Detection condition
--- | ---
Security light flashing pattern | Keyless warning light | WDS or equivalent display
Keyless control module | PCM
11 |  | Off | - | B1681 | No communication detected between keyless control module and PCM
On | B1681 | B1681 | No communication detected between coil antenna and keyless control module
12 |  | On | B2103 | B2103 | Coil antenna malfunction
13 |  | Off | - | B1600 B2431 | Key ID number cannot be read
14 |  | Off | - | B1602 | Key ID number cannot be read
15 |  | Off | - | B1601 | Unprogrammed key ID number detected
On | B1342 | B1601 | Keyless control module malfunction
21 |  | On | B1213 | B1213 | Only one key ID number is programmed to the PCM
- | - | On | B1213 | - | Only one key ID number is programmed to the keyless control module
- | - | On | U0073 | - | CAN malfunction
- | - | Off | U0323 U0100 U2023 | - | CAN malfunction