DTC U1A4B:43, U1A4B:44, U1A4B:45, U1A4B:46, U1A4B:47, U1A4B:48, U1A4B:49, U1A4B:96 [REAR VEHICLE MONITORING SYSTEM]

id0902z2887800

System malfunction location

Rear vehicle monitoring control module (LH) malfunction

Detection condition

•  U1A4B:43

―  Rear vehicle monitoring control module (LH) external RAM malfunction detected.

•  U1A4B:44

―  Rear vehicle monitoring control module (LH) internal RAM malfunction detected.

•  U1A4B:45

―  Rear vehicle monitoring control module (LH) ROM malfunction detected.

•  U1A4B:46

―  Rear vehicle monitoring control module (LH) EEPROM malfunction detected.

•  U1A4B:47

―  Rear vehicle monitoring control module (LH) monitoring system malfunction detected.

•  U1A4B:48

―  Rear vehicle monitoring control module (LH) communication circuit malfunction detected.

•  U1A4B:49

―  Rear vehicle monitoring control module (LH) voltage control circuit malfunction detected.

•  U1A4B:96

―  Rear vehicle monitoring control module (LH) internal circuit malfunction detected.

Fail-safe

•  U1A4B:43

―  Inhibits the rear vehicle monitoring system.

•  U1A4B:44

―  Inhibits the rear vehicle monitoring system.

•  U1A4B:45

―  Inhibits the rear vehicle monitoring system.

•  U1A4B:46

―  Inhibits the rear vehicle monitoring system.

•  U1A4B:47

―  Inhibits the rear vehicle monitoring system.

•  U1A4B:48

―  Inhibits the rear vehicle monitoring system.

•  U1A4B:49

―  Inhibits the rear vehicle monitoring system.

•  U1A4B:96

―  Inhibits the rear vehicle monitoring system.

Possible cause

•  Rear vehicle monitoring control module (LH) malfunction

System wiring diagram

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System malfunction location	Rear vehicle monitoring control module (LH) malfunction
Detection condition	• U1A4B:43 ― Rear vehicle monitoring control module (LH) external RAM malfunction detected. • U1A4B:44 ― Rear vehicle monitoring control module (LH) internal RAM malfunction detected. • U1A4B:45 ― Rear vehicle monitoring control module (LH) ROM malfunction detected. • U1A4B:46 ― Rear vehicle monitoring control module (LH) EEPROM malfunction detected. • U1A4B:47 ― Rear vehicle monitoring control module (LH) monitoring system malfunction detected. • U1A4B:48 ― Rear vehicle monitoring control module (LH) communication circuit malfunction detected. • U1A4B:49 ― Rear vehicle monitoring control module (LH) voltage control circuit malfunction detected. • U1A4B:96 ― Rear vehicle monitoring control module (LH) internal circuit malfunction detected.
Fail-safe	• U1A4B:43 ― Inhibits the rear vehicle monitoring system. • U1A4B:44 ― Inhibits the rear vehicle monitoring system. • U1A4B:45 ― Inhibits the rear vehicle monitoring system. • U1A4B:46 ― Inhibits the rear vehicle monitoring system. • U1A4B:47 ― Inhibits the rear vehicle monitoring system. • U1A4B:48 ― Inhibits the rear vehicle monitoring system. • U1A4B:49 ― Inhibits the rear vehicle monitoring system. • U1A4B:96 ― Inhibits the rear vehicle monitoring system.
Possible cause	• Rear vehicle monitoring control module (LH) malfunction
System wiring diagram	—

Diagnostic Procedure

Step	Inspection		Action
1	PERFORM DTC INSPECTION AND VERIFY REAR VEHICLE MONITORING CONTROL MODULE (LH) MALFUNCTION • 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].) • Are DTCs U1A4B:43/U1A4B:44/U1A4B:45/U1A4B:46/U1A4B:47/U1A4B:48/U1A4B:49/U1A4B:96 displayed?	Yes	Replace the rear vehicle monitoring control module (LH), then go to the next step. (See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)
1		No	Go to the next step.
2	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].)
2		No	DTC troubleshooting completed.