Lexus IS250 IS220d GSE20 ALE20 - MULTIPLEX COMMUNICATION

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.
This DTC is detected when communication between the certification ECU and gateway ECU stops for more than 10 seconds.
DTC No.DTC Detection ConditionTrouble Area
B1207Certification ECU communication stops
Certification ECU
Wire harness

WIRING DIAGRAM

Dtc B1207 Smart Ecu Stop. MULTIPLEX COMMUNICATION. Lexus IS250 IS220d GSE20 ALE20

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)

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

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)
Dtc B1207 Smart Ecu Stop. MULTIPLEX COMMUNICATION. Lexus IS250 IS220d GSE20 ALE20

Disconnect the P33 ECU connector.

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

  • Standard voltage:
  • Tester ConnectionConditionSpecified Condition
    +B1 (P33-1) - Body groundAlways10 to 14 V
  • Standard resistance:
  • Tester ConnectionSpecified Condition
    E (P33-17) - Body groundBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3.CHECK RESISTANCE OF COMMUNICATION LINE

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

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

Dtc B1207 Smart Ecu Stop. MULTIPLEX COMMUNICATION. Lexus IS250 IS220d GSE20 ALE20

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

  • Standard resistance:
  • Tester ConnectionSpecified 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: LHD
*2: RHD
  • Result:
  • ResultProceed to
    Both are OKA
    One is OKB
    Both are NGC
B
REPAIR OR REPLACE HARNESS OR CONNECTOR AND REPLACE CERTIFICATION ECU
C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A
REPLACE CERTIFICATION ECU
LEXUS IS250, IS220d / GSE20 ALE20
MULTIPLEX COMMUNICATION
Lexus IS250 IS220d GSE20 ALE20
MULTIPLEX COMMUNICATION SYSTEM