DTC U1A4B:43/U1A4B:44/U1A4B:45/U1A4B:46/U1A4B:47/U1A4B:48/U1A4B:49/U1A4B:96 [BLIND SPOT MONITORING (BSM) SYSTEM]

id09021o065700

Caution
•  When replacing a blind spot monitoring (BSM) control module (RH) having any of the following part numbers, it is necessary to replace the blind spot monitoring (BSM) control module (LH) at the same time to perform the configuration normally.
―  DA6A-67Y80 A
―  DA6A-67Y80 B

Description

Blind spot monitoring (BSM) control module (RH) malfunction
Detection condition
•  U1A4B:43
―  Blind spot monitoring (BSM) control module (RH) external RAM malfunction detected with the ignition switched ON (engine off or on).
•  U1A4B:44
―  Blind spot monitoring (BSM) control module (RH) internal RAM malfunction detected with the ignition switched ON (engine off or on).
•  U1A4B:45
―  Blind spot monitoring (BSM) control module (RH) ROM malfunction detected with the ignition switched ON (engine off or on).
•  U1A4B:46
―  Blind spot monitoring (BSM) control module (RH) EEPROM malfunction detected with the ignition switched ON (engine off or on).
•  U1A4B:47
―  Blind spot monitoring (BSM) control module (RH) monitoring system malfunction detected with the ignition switched ON (engine off or on).
•  U1A4B:48
―  Blind spot monitoring (BSM) control module (RH) communication circuit malfunction detected with the ignition switched ON (engine off or on).
•  U1A4B:49
―  Blind spot monitoring (BSM) control module (RH) voltage control circuit malfunction detected for 1 s or more with the ignition switched ON (engine off or on).
•  U1A4B:96
―  Blind spot monitoring (BSM) control module (RH) internal circuit malfunction detected for 1 s or more with the ignition switched ON (engine off or on).
Fail-safe
•  U1A4B:43
―  Blind spot monitoring (BSM) system is stopped.
•  U1A4B:44
―  Blind spot monitoring (BSM) system is stopped.
•  U1A4B:45
―  Blind spot monitoring (BSM) system is stopped.
•  U1A4B:46
―  Blind spot monitoring (BSM) system is stopped.
•  U1A4B:47
―  Blind spot monitoring (BSM) system is stopped.
•  U1A4B:48
―  Blind spot monitoring (BSM) system is stopped.
•  U1A4B:49
―  Blind spot monitoring (BSM) system is stopped.
•  U1A4B:96
―  Blind spot monitoring (BSM) system is stopped.
Possible cause
•  Blind spot monitoring (BSM) control module (RH) malfunction
System wiring diagram
Not applicable

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY IF MALFUNCTIONING LOCATION IS BLIND SPOT MONITORING (BSM) CONTROL MODULE (RH) DEPENDING ON REPEATABILITY
•  Clear the DTC for the blind spot monitoring (BSM) control module using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 2.5 s or more.
•  Retrieve the blind spot monitoring (BSM) control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the blind spot monitoring (BSM) control module, then go to the next step.
(See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION.)
No
Go to the next step.
2
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [BLIND SPOT MONITORING (BSM) SYSTEM].)
No
DTC troubleshooting completed.