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