Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: ECU Power Source Circuit System Voltage Low (B2620A2)

DESCRIPTION

The ECU power source circuit supplies positive (+) voltage to the multiplex tilt and telescopic ECU.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2620A2	ECU Power Source Circuit System Voltage Low	The voltage of the ECU power source drops to 8 V or less for 10 seconds or more.	ECU-DCC NO. 2 fuse Harness or connector Multiplex tilt and telescopic ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

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

(a) Disconnect the G49 multiplex tilt and telescopic ECU connector.

*a	Front view of wire harness connector (to Multiplex Tilt and Telescopic ECU)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G49-9 (ECUB) - Body ground	Power switch off	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the G49 multiplex tilt and telescopic ECU connector.

*a	Front view of wire harness connector (to Multiplex Tilt and Telescopic ECU)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G49-8 (GND2) - Body ground	Always	Below 1 Ω

REPLACE MULTIPLEX TILT AND TELESCOPIC ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Smart Key System(for Start Function, Gasoline Model): Lost Communication with ECM / PCM (U0100,U0140,U0142,U0155)
DESCRIPTION These DTCs are stored when there is a CAN communication malfunction between the certification ECU (smart key ECU assembly), ECM, main body ECU (multiplex network body ECU) or combination meter assembly, and data from the option connector (bus buffer ECU) cannot be received. DTC No. Detec ...

Toyota Avalon (XX50) 2019-2022 Owners Manual