Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: 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. |
|
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. |
|
(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 |
|
| 2. | CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - BODY GROUND) |
| (a) Disconnect the J25 multiplex tilt and telescopic ECU connector. |
|
(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 |
Telescopic Position Sensor or Telescopic Motor Circuit Malfunction (B2611)
DESCRIPTION The telescopic motor is operated by the power source voltage supplied from the multiplex tilt and telescopic ECU and slides the steering column forward and backward. The telescopic positio ...
Vehicles Speed Malfunction (B2624)
DESCRIPTION The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems via CAN communication. Each ECU informs the other ECUs that it is connected to the network by sending a ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Window Defogger System: System Description
SYSTEM DESCRIPTION GENERAL The rear window defogger wire (back window glass) is attached to the inside of the rear window and defogs the window surface quickly when the rear window defogger switch is pressed. The indicator light on the switch illuminates while the system is operating. This system au ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Electric Parking Brake System: Right Electric Parking Brake Actuator Control Circuit Short to Battery (C061012)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note C061012 Right Electric Parking Brake Actuator Control Circuit Short to Battery
Diagnosis Condition:
Electric parking brake not operating
Malfunction Status:
The ECU power supply is normal bu ...
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
0.0133