DTC U1A4B:54 [REAR VEHICLE MONITORING SYSTEM]

id0902z2668600

System malfunction location

Radar aiming is not performed or radar sensor axis is deviated (rear vehicle monitoring control module (LH))

Detection condition

•  Malfunction in radar aiming of rear vehicle monitoring control module (LH) detected for 1 s or more.

Fail-safe

•  Inhibits the rear vehicle monitoring system.

Possible cause

•  Rear vehicle monitoring control module (LH) radar aiming was not performed.

•  Deviation of rear vehicle monitoring control module (LH) radar sensor axis

•  Rear vehicle monitoring control module (LH) malfunction

System wiring diagram

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System malfunction location	Radar aiming is not performed or radar sensor axis is deviated (rear vehicle monitoring control module (LH))
Detection condition	• Malfunction in radar aiming of rear vehicle monitoring control module (LH) detected for 1 s or more.
Fail-safe	• Inhibits the rear vehicle monitoring system.
Possible cause	• Rear vehicle monitoring control module (LH) radar aiming was not performed. • Deviation of rear vehicle monitoring control module (LH) radar sensor axis • Rear vehicle monitoring control module (LH) malfunction
System wiring diagram	—

Diagnostic Procedure

Step	Inspection		Action
1	PERFORM REAR VEHICLE MONITORING CONTROL MODULE (LH) RADAR AIMING • Perform the rear vehicle monitoring control module (LH) radar aiming. PERFORM REAR VEHICLE MONITORING CONTROL MODULE (LH) RADAR AIMING (See REAR VEHICLE MONITORING RADAR AIMING.) • Clear the DTC for the rear vehicle monitoring control module using the M-MDS. (See CLEARING DTC [REAR VEHICLE MONITORING SYSTEM].) • Switch the ignition ON (engine off or on) and wait for 1.5 s or more. • Perform the DTC inspection for the rear vehicle monitoring control module using the M-MDS. (See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].) • Is DTC U1A4B:54 displayed?	Yes	Perform the rear vehicle monitoring control module (LH) radar aiming again, then go to the next step. (See REAR VEHICLE MONITORING RADAR AIMING.)
1		No	Go to Step 3.
2	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Clear the DTC for the rear vehicle monitoring control module using the M-MDS. (See CLEARING DTC [REAR VEHICLE MONITORING SYSTEM].) • Switch the ignition ON (engine off or on) and wait for 1.5 s or more. • Perform the DTC inspection for the rear vehicle monitoring control module using the M-MDS. (See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].) • Is DTC U1A4B:54 displayed?	Yes	Replace the rear vehicle monitoring control module (LH), then go to the next step. (See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)
2		No	Go to the next step.
3	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [REAR VEHICLE MONITORING SYSTEM].)
3		No	DTC troubleshooting completed.