DTC U1A4B:17 [BLIND SPOT MONITORING (BSM) CONTROL MODULE]

id1502b5014900

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.
―  N243-67Y80 G

Description

Blind spot monitoring (BSM) control module (RH) high power supply voltage input
Detection condition
•  Blind spot monitoring (BSM) control module (RH) power supply circuit voltage of 16 V or more is detected for 1 s or more with the ignition switched ON (engine off or on).
Fail-safe
•  Blind spot monitoring (BSM) system is stopped.
Possible cause
Without i-ELOOP:
•  DTCs are stored in the PCM.
•  Battery malfunction
•  Generator malfunction
•  Blind spot monitoring (BSM) control module (RH) malfunction
With i-ELOOP:
•  DTCs are stored in the PCM.
•  DTCs are stored in the DC-DC converter (i-ELOOP).
•  DC-DC converter (i-ELOOP) malfunction
•  Battery malfunction
•  Generator malfunction
•  Blind spot monitoring (BSM) control module (RH) malfunction
System wiring diagram
Not applicable

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY PCM DTCs
•  Retrieve the PCM DTCs using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0)].)
No
Without i-ELOOP:
•  Go to Step 4.
With i-ELOOP:
•  Go to the next step.
2
VERIFY DC-DC CONVERTER (I-ELOOP) DTCs
•  Retrieve the DC-DC converter (i-ELOOP) DTCs using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [i-ELOOP].)
No
Go to the next step.
3
INSPECT DC-DC CONVERTER (i-ELOOP)
•  Inspect the DC-DC converter (i-ELOOP).
•  Is the DC-DC converter (i-ELOOP) normal?
Yes
Go to the next step.
No
Replace the DC-DC converter (i-ELOOP), then go to Step 6.
(See DC-DC CONVERTER (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP].)
4
INSPECT BATTERY
•  Inspect the battery.
•  Is the battery normal?
Yes
Go to the next step.
No
Replace the battery, then go to Step 6.
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0].)
5
INSPECT GENERATOR
•  Inspect the generator.
•  Is the generator normal?
Yes
Go to the next step.
No
Replace the generator, then go to the next step.
(See GENERATOR REMOVAL/INSTALLATION [WITHOUT i-ELOOP (SKYACTIV-G 1.5, SKYACTIV-G 2.0)].)
(See GENERATOR REMOVAL/INSTALLATION [WITH i-ELOOP (SKYACTIV-G 1.5, SKYACTIV-G 2.0)].)
6
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  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 Pending DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the blind spot monitoring (BSM) control module.
Go to the next step.
No
Go to the next step.
7
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) CONTROL MODULE].)
No
DTC troubleshooting completed.