DTC    U0208    Lost Communication with "Seat Control Module A"

for Preparation Click here


DESCRIPTION


DTC No.
DTC Detection Condition
Trouble Area
U0208
No communication from the position control ECU and switch assembly continues.
  1. Position control ECU and switch assembly branch line or connector
  2. Power source circuit of position control ECU and switch assembly
  3. Position control ECU and switch assembly

HINT:
This diagnosis procedure is for when DTC U0208 is output by the main body ECU (Intelligent tester display: Main Body).


WIRING DIAGRAM


C235788E04


C235788E07


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 Main Body of the main body ECU, this indicates a MS bus malfunction. Troubleshoot for DTC U1002 and check for malfunctions in the MS bus.

    Result:
    Result
    		Proceed to
    U1002 is not output from main body ECU (Intelligent tester display/Main Body)
    		A
    U1002 is output from main body ECU (Intelligent tester display/Main Body)
    		B



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


2.CHECK CAN BUS LINE FOR DISCONNECTION (POSITION CONTROL ECU AND SWITCH ASSEMBLY BRANCH LINE)

  1. Turn the power switch off.



    C188242E36

  1. Disconnect the position control ECU and switch assembly connector.

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    X5-8 (CANP) - X5-7 (CANN)
    		Power switch off
    		54 to 69 Ω
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    W4-8 (CANP) - W4-7 (CANN)
    		Power switch off
    		54 to 69 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Position Control ECU and Switch Assembly)
    *b
    		for LHD
    *c
    		for RHD



NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY)
OK


3.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    C234540E01

  1. Disconnect the position control ECU and switch assembly connector.

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    X4-2 (GND) - Body ground
    		Always
    		Below 1 Ω
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    W3-2 (GND) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    for LHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    X4-7 (+B) - Body ground
    		Power switch off
    		11 to 14 V
    X5-12 (SYSB) - Body ground
    		Power switch off
    		11 to 14 V
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    W3-7 (+B) - Body ground
    		Power switch off
    		11 to 14 V
    W4-12 (SYSB) - Body ground
    		Power switch off
    		11 to 14 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Position Control ECU and Switch Assembly)
    *b
    		for LHD
    *c
    		for RHD



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

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)