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

id0902z2887800

Description

Rear vehicle monitoring control module (RH) malfunction
Detection condition
•  U1A4B:43
―  Rear vehicle monitoring control module (RH) external RAM malfunction detected.
•  U1A4B:44
―  Rear vehicle monitoring control module (RH) internal RAM malfunction detected.
•  U1A4B:45
―  Rear vehicle monitoring control module (RH) ROM malfunction detected.
•  U1A4B:46
―  Rear vehicle monitoring control module (RH) EEPROM malfunction detected.
•  U1A4B:47
―  Rear vehicle monitoring control module (RH) monitoring system malfunction detected.
•  U1A4B:48
―  Rear vehicle monitoring control module (RH) communication circuit malfunction detected.
•  U1A4B:49
―  Rear vehicle monitoring control module (RH) voltage control circuit malfunction detected for 1 s or more.
•  U1A4B:96
―  Rear vehicle monitoring control module (RH) internal circuit malfunction detected for 1 s or more.
Fail-safe function
•  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 (RH) malfunction
System wiring diagram
Not applicable

Diagnostic Procedure

Step

Inspection

Action
1
PERFORM DTC INSPECTION AND VERIFY REAR VEHICLE MONITORING CONTROL MODULE (RH) MALFUNCTION
•  Clear the DTC for the rear vehicle monitoring control module using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 2.5 s or more.
•  Retrieve the rear vehicle monitoring control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear vehicle monitoring control module (RH).
Go to the next step.
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 [REAR VEHICLE MONITORING SYSTEM].)
No
DTC troubleshooting completed.