Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000000XZB00RX
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: STEERING COLUMN: POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM: B2620; ECU Power Source Circuit Malfunction; 2007 MY LX470 [08/2006 -        ]

DTC

B2620

ECU Power Source Circuit Malfunction

DESCRIPTION

The ECU power source circuit supplies positive voltage to the tilt and telescopic ECU.

DTC No.

DTC Detection Cndition

Trouble Area

B2620

The voltage of the ECU power source drops to 8 V or less and continues for 10 seconds or more.
  • Battery
  • ECU power source circuit
  • Tilt and telescopic ECU
  • Wire harness

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK THAT BATTERY POSITIVE VOLTAGE IS 11 V OR MORE WHEN ENGINE STOPPED
NG

CHARGE OR REPLACE BATTERY

OK

2.

CHECK TILT AND TELESCOPIC ECU

(a) Remove the ECU with the connectors still connected.

(b) Measure the voltage between terminals ECUB and GND of the T8 ECU connector.

Standard voltage:

8 to 16 V

OK

REPLACE TILT AND TELESCOPIC ECU

NG

3.

CHECK WIRE HARNESS (ECU - BODY GROUND)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

4.

INSPECT FUSE (ECU-B2, BAT)

(a) Remove the ECU-B2 fuse from the cowl side junction block RH.

(b) Remove the BAT fuse from the engine room junction block.

(c) Measure the resistance of the fuses.

Standard resistance:

Below 1 Ω

NG

REPLACE FUSE

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE