Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: ECU Power Source Circuit Malfunction (B2620)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Steering / Steering Column / Power Tilt And Power Telescopic Steering Column System / ECU Power Source Circuit Malfunction (B2620)

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

B2620

ECU Power Source Circuit Malfunction

The voltage of the ECU power source drops to 8 V or less and this condition continues for 10 seconds or more.
  • ECU-B NO. 2 fuse
  • Harness or connector
  • Multiplex tilt and telescopic ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

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 - BATTERY)

(a) Disconnect the J25 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

J25-9 (ECUB) - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

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

(a) Disconnect the J25 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

J25-8 (GND2) - Body ground

Always

Below 1 Ω
OK

REPLACE MULTIPLEX TILT AND TELESCOPIC ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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