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ON-BOARD DIAGNOSTIC SYSTEM (IMMOBILIZER SYSTEM) MALFUNCTION DIAGNOSIS FUNCTION

BHE091401077T05

• The immobilizer system is provided with a malfunction diagnosis function.

• Malfunction diagnosis of the immobilizer system occurs automatically when the ignition switch 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 displays a DTC. At the same time, DTCs are stored in the PCM and keyless unit. The stored DTCs can be verified using the WDS.

  Caution

  • Always use the WDS to verify DTCs even if the security light display a DTC. If the security light itself has a malfunction, it is possible that a DTC may not be properly displayed. There are certain DTCs which can only be verified using the WDS, not the security light.
  • DTCs for the immobilizer system that are stored in the keyless unit and PCM are cleared when the ignition switch is turned from the ON to the LOCK (ACC) position.

  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 displayed by the security light. However, multiple DTCs are stored at the same time.
  • If two or more immobilizer system DTCs are verified, first repair the part indicated by the security light displayed DTC. 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 displaying the DTC, the security light will illuminate or flash the following patterns:

Security light flashing pattern (Before displaying DTC) | DTC
--- | ---
| 11, 12, 13, 14, 15, 16
| 21, 22, 23

DTC | Detected condition
--- | ---
Security light flashing pattern | WDS display
Keyless unit | PCM
11 |  | B1681 | P1260 | Signal communication with the coil cannot be detected.
12 |  | B2103 | P1260 | Coil malfunction
13 |  | B1600 | P1260 | The key ID number data cannot be read.
B2431 | P1260 | Key ID number registration error
14 |  | B1602 | P1260 | The keyless unit cannot read key ID number data normally.
15 |  | B1601 | P1260 | Unregistered key detected.
16 |  | U2510 | P1260 | Communication error between the keyless unit and the PCM (no response)
U1147 | P1260 | Communication error between the keyless unit and the PCM (mismatched conditions)
21 |  | B1213 | P1260 | Only one key is registered.
22 |  | B2141 | P1260 | Communication error between the keyless unit and the PCM (data transfer error)
23 |  | B2139 | P1260 | PCM ID number data mismatch
Not illuminated | B1342 | - | Keyless unit malfunction