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 line or connector
  2. Power source circuit of parking assist ECU
  3. Parking assist ECU

HINT:
This diagnosis procedure is for when DTC U110B is output by the power management control ECU (Intelligent tester display: PM1 Gateway).


WIRING DIAGRAM


C236207E01


INSPECTION PROCEDURE

NOTICE:
  1. Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.
  2. Turn the power switch off before inspecting CAN bus lines 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 DTC U1002 is output from PM1 Gateway of the power management control ECU, this indicates a V2 bus malfunction. Troubleshoot for DTC U1002 and check for malfunctions in the V2 bus.

    Result:
    Result
    		Proceed to
    U1002 is not output from power management control ECU (Intelligent tester display/PM1 Gateway)
    		A
    U1002 is output from power management control ECU (Intelligent tester display/PM1 Gateway)
    		B



B
GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC (Click here)
A


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

  1. Turn the power switch off.



    E159992E37

  1. Disconnect the parking assist ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H9-22 (CANH) - H9-21 (CANL)
    		Power switch off
    		54 to 69 Ω

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



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


3.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    E159992E38

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H9-3 (GND1) - Body ground
    		Always
    		Below 1 Ω

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

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H9-1 (+B) - Body ground
    		Power switch off
    		11 to 14 V
    H9-8 (ACC) - Body ground
    		Power switch on (ACC)
    		11 to 14 V
    H9-7 (IG) - Body ground
    		Power switch on (IG)
    		11 to 14 V



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

REPLACE PARKING ASSIST ECU (Click here)