Wireless Control Module (WCM)

Code No.B1A10 Keyless/KOS key 1 low battery
Code No.B1A11 Keyless/KOS key 2 low battery
Code No.B1A12 Keyless/KOS key 3 low battery
Code No.B1A13 Keyless/KOS key 4 low battery
Code No.B1A14 Keyless key 5 low battery
Code No.B1A15 Keyless key 6 low battery
Code No.B1A16 Keyless key 7 low battery
Code No.B1A17 Keyless key 8 low battery

CAUTION:
When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION

WCM sets the diagnostic trouble code No. B1A10, B1A11, B1A12, B1A13, B1A14, B1A15, B1A16, or B1A17 when it receives low battery voltage signal from the transmitter.

JUDGEMENT CRITERIA

- B1A10: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 1 (the first transmitter registered in WCM) five consecutive times.

- B1A11: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 2 (the second transmitter registered in WCM) five consecutive times.

- B1A12: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 3 (the third transmitter registered in WCM) five consecutive times.

- B1A13: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 4 (the fourth transmitter registered in WCM) five consecutive times.

- B1A14: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 5 (the fifth transmitter registered in WCM) five consecutive times.

- B1A15: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 6 (the sixth transmitter registered in WCM) five consecutive times.

- B1A16: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 7 (the seventh transmitter registered in WCM) five consecutive times.

- B1A17: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 8 (the eighth transmitter registered in WCM) five consecutive times.

PROBABLE CAUSES

- Battery failure in the transmitter

- Malfunction of the transmitter

- Malfunction of WCM

DIAGNOSTIC PROCEDURE

STEP 1. Replace the battery in the transmitter and recheck the diagnostic trouble code.

Replace the battery in the transmitter with a new one, and recheck if the diagnostic trouble code is set.
(1)Replace the battery in the transmitter.

(2)Use the transmitter to lock/unlock the doors.

(3)Check if the diagnostic trouble code is set.

Q. Is the diagnostic trouble code set?

YES Go to Step 2.

NO The procedure is complete. (Discharged battery)

STEP 2. Replace the transmitter and recheck the diagnostic trouble code.

Replace the transmitter with a new one, register the encrypted code and the keyless entry secret code (Refer to ID Codes Registration Procedure), and recheck if the diagnostic trouble code is set.
(1)Use the transmitter to lock/unlock the doors.

(2)Check if the diagnostic trouble code is set.

Q. Is the diagnostic trouble code set?

YES Replace WCM and register the ID codes (Refer to ID registration procedure manual
- ID codes registration judgement table).

NO The procedure is complete.