ON-BOARD DIAGNOSTIC SYSTEM (IMMOBILIZER SYSTEM) MALFUNCTION DIAGNOSIS FUNCTION [ADVANCED KEYLESS ENTRY AND START SYSTEM]SM1935417
ON-BOARD DIAGNOSTIC SYSTEM (IMMOBILIZER SYSTEM) MALFUNCTION DIAGNOSIS FUNCTION [ADVANCED KEYLESS ENTRY AND START SYSTEM]

id0914z6102100

• 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 control module. The stored DTCs can be verified using the Mazda Modular Diagnostic System (M-MDS).
Caution
• Always use the Mazda Modular Diagnostic System (M-MDS) 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 Mazda Modular Diagnostic System (M-MDS), not the security light.
• DTCs for the immobilizer system that are stored in the keyless control module 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

Detection condition

Security light flashing pattern

Mazda Modular Diagnostic System (M-MDS) display*

Keyless control module

PCM
11
B1681
P1260:00
No detected communication with the coil antenna
12
B2103
P1260:00
Coil antenna malfunction
13
B1600
P1260:00
The key ID number data cannot be read
B2431
P1260:00
Key ID number registration error
14
B1602
P1260:00
The keyless control module cannot read key ID number data normally
15
B1601
P1260:00
The keyless control module has detected unregistered key ID number
16
U2510
P1260:00
Communication error between the keyless control module and the PCM (no response)
21
B1213
P1260:00
Only one key ID number is registered
22
B2141
P1260:00
Communication error between the keyless control module and the PCM (data transfer error)
23
B2139
P1260:00
ID number data in the PCM and the keyless control module do not match
Not illuminated
B1342
-
Keyless control module malfunction