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.	Battery Wire harness or connector Multiplex tilt & telescopic ECU

Dtc B2620 Ecu Power Source Circuit Malfunction. STEERING COLUMN. Lexus IS250 IS220d GSE20 ALE20

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

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

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

OK

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

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE MULTIPLEX TILT & TELESCOPIC ECU

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

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

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

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

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

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

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