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DTC    U110B    Lost Communication with Parking Assist Control Module "B"

for Preparation Click here


DESCRIPTION


DTC No.
DTC Detection Condition
Trouble Area
U110B
No communication from the parking assist ECU continues.
  1. Parking assist ECU branch wire or connector
  2. Power source circuit of parking assist ECU
  3. Parking assist ECU

HINT:
The diagnosis procedure is for when DTC U110B is output by the power management control ECU (Intelligent tester display: Power Management1).


WIRING DIAGRAM


C210450E03


INSPECTION PROCEDURE

NOTICE:
  1. Turn the power switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
  2. Turn the power switch off before inspecting CAN bus wires for a ground short.
  3. After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  4. Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:
  1. Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  2. Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

1.RECONFIRM DTC OUTPUT

  1. Reconfirm DTCs.

    HINT:
    If CAN No. 2 bus DTC U1002 is output from the power management control ECU (Intelligent tester display/Power Management1), troubleshoot for U1002 and check for malfunctions in the CAN No. 2 main bus circuit.

    Result:
    Result
    		Proceed to
    U1002 is not output from power management control ECU (Intelligent tester display/Power Management1)
    		A
    U1002 is output from power management control ECU (Intelligent tester display/Power Management1)
    		B



B
GO TO CIRCUITS INDICATED BY OUTPUT DTCS (Click here)
A


2.CHECK CAN BUS WIRE FOR DISCONNECTION (PARKING ASSIST ECU BRANCH WIRE)

  1. Turn the power switch off.



    E159992E16

  1. Disconnect the parking assist ECU connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Parking Assist ECU)

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    L65-22 (CANH) - L65-21 (CANL)
    		Power switch off
    		54 to 69 Ω



NG
REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (PARKING ASSIST ECU BRANCH WIRE)
OK


3.CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    E159992E17

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    L65-8 (ACC) - Body ground
    		Power switch on (ACC)
    		11 to 14 V
    L65-7 (IG) - Body ground
    		Power switch on (IG)
    		11 to 14 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Parking Assist ECU)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK


4.CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    E159992E18

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L65-3 (GND1) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Parking Assist ECU)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)
OK

REPLACE PARKING ASSIST ECU (Click here)