Dtc B2620 Ecu Power Source Circuit Malfunction

Steering. Lexus Gs430, Gs300. Uzs190 Grs190
Steering Column. Lexus Gs430, Gs300. Uzs190 Grs190

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 continues for 10 secs. or more.
  1. Battery
  2. Wire harness or connector
  3. Multiplex tilt & telescopic ECU

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc B2620 Ecu Power Source Circuit Malfunction


INSPECTION PROCEDURE

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


    Lexus Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc B2620 Ecu Power Source Circuit Malfunction

  1. Disconnect the L27 connector from the multiplex tilt & telescopic ECU.

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

    Voltage:
    Tester connection
    (Terminal No.)
    		Condition
    		Specified value
    ECUB (L27-9) - 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 Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc B2620 Ecu Power Source Circuit Malfunction

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

    Resistance:
    Tester connection
    (Terminal No.)
    		Condition
    		Specified value
    GND (L27-11) - 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 Gs430, Gs300. Uzs190 Grs190.Steering Column.Steering System. Dtc B2620 Ecu Power Source Circuit Malfunction

  1. Disconnect the DA connector from the cowl side J/B RH.

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

    Resistance:
    Tester condition
    (Terminals No.)
    		Condition
    		Specified value
    ECUB (L27-9) - DA-18
    		Always
    		Below 1 Ω
    ECUB (L27-9) - 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)