Dtc B1207 Smart Ecu Stop

Communication System. Lexus Is250, Is220D. Gse20 Ale20
Multiplex Communication. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (SECURITY)

CHECK WIRE HARNESS (CERTIFICATION ECU - BATTERY AND BODY GROUND)

CHECK RESISTANCE OF COMMUNICATION LINE

DTC B1207 Smart ECU Stop


DESCRIPTION

HINT:
This DTC is only output on vehicles equipped with an entry and start system.
  1. This DTC is detected when communication between the certification ECU and gateway ECU stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1207
Certification ECU communication stops
  1. Certification ECU
  2. Wire harness

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System. Dtc B1207 Smart Ecu Stop


INSPECTION PROCEDURE

HINT:
When "B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1206, repair the "+B or GND short malfunction of communication bus" DTCs first.
1.INSPECT FUSE (SECURITY)

  1. Remove the SECURITY fuse from the main body ECU LH (cowl side J/B LH).

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


2.CHECK WIRE HARNESS (CERTIFICATION ECU - BATTERY AND BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System. Dtc B1207 Smart Ecu Stop

  1. Disconnect the P33 ECU connector.

  1. Measure the voltage and resistance of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    +B1 (P33-1) - Body ground
    		Always
    		10 to 14 V
    Standard resistance:
    Tester Connection
    		Specified Condition
    E (P33-17) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK RESISTANCE OF COMMUNICATION LINE

  1. Disconnect the P33, RJ and M7 ECU connectors (for LHD).



  1. Disconnect the P33, L17 and Q3 ECU connectors (for RHD).


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System. Dtc B1207 Smart Ecu Stop

  1. Measure the resistance between the specified terminals on the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    *1MPX1 (P33-27) - MPX1 (RJ-21)
    *2MPX1 (P33-27) - MPX1 (L17-7)
    		Below 1 Ω
    *1MPX2 (P33-28) - MPX2 (M7-8)
    *2MPX2 (P33-28) - MPX1 (Q3-15)
    		Below 1 Ω
    HINT:
    1. *1: LHD
    2. *2: RHD
    Result:
    Result
    		Proceed to
    Both are OK
    		A
    One is OK
    		B
    Both are NG
    		C


B
REPAIR OR REPLACE HARNESS OR CONNECTOR AND REPLACE CERTIFICATION ECU

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE CERTIFICATION ECU