Dtc B2620 Ecu Power Source Circuit Malfunction

Steering. Lexus Is250, Is220D. Gse20 Ale20
Steering Column. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - BATTERY)

CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - BODY GROUND)

CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - COWL SIDE J/B RH)

DTC B2620 ECU Power Source Circuit Malfunction


DESCRIPTION

The ECU power source circuit supplies positive voltage to the multiplex tilt & telescopic ECU.

DTC No.
Detection Item
Trouble Area
B2620
The voltage of the ECU power source drops to 8 V or less and this condition continues for 10 sec. or more.
  1. Battery
  2. Wire harness or connector
  3. Multiplex tilt & telescopic ECU

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Steering Column.Steering System. Dtc B2620 Ecu Power Source Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - BATTERY)


    Lexus Is250, Is220D. Gse20 Ale20.Steering Column.Steering System. Dtc B2620 Ecu Power Source Circuit Malfunction

  1. Disconnect the J28 connector from the multiplex tilt & telescopic ECU.

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

    Standard voltage:
    Tester connection
    (Terminal No.)
    		Condition
    		Specified value
    ECUB (J28-9) - Body ground
    		Always
    		10 to 14 V


NG
Go to step 3
OK


2.CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.Steering Column.Steering System. Dtc B2620 Ecu Power Source Circuit Malfunction

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

    Standard resistance:
    Tester connection
    (Terminal No.)
    		Condition
    		Specified value
    GND (J28-11) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MULTIPLEX TILT & TELESCOPIC ECU

3.CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - COWL SIDE J/B RH)


    Lexus Is250, Is220D. Gse20 Ale20.Steering Column.Steering System. Dtc B2620 Ecu Power Source Circuit Malfunction

  1. Disconnect the RA connector from the main body ECU RH (cowl side J/B RH).

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

    Standard resistance:
    Tester condition
    (Terminals No.)
    		Condition
    		Specified value
    ECUB (J28-9) - RA-18
    		Always
    		Below 1 Ω
    ECUB (J28-9) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - COWL SIDE J/B RH)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - COWL SIDE J/B RH)