Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000001CXN004X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: ECU Power Source Circuit; 2007 MY LX470 [08/2006 -        ]

ECU Power Source Circuit

SYSTEM DESCRIPTION

This circuit supplies power to operate the body ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

INSPECT FUSE (ECU-B2, DOOR)

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

(b) Remove the DOOR fuse from the cowl side junction block RH.

(c) Measure the resistance of the fuses.

Standard resistance:

Below 1 Ω

NG

REPLACE FUSE

OK

2.

CHECK WIRE HARNESS (BODY ECU (MAIN) - BATTERY)

(a) Disconnect the 2C and 2Q junction block connectors.

(b) Measure the voltage of the wire harness side connectors.

Standard voltage:

Tester Connection

Specified Condition

2Q-22 (BECU) - Body ground

10 to 14 V

2C-1 (BDR1) - Body ground

10 to 14 V
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE

NG

3.

CHECK WIRE HARNESS (BODY ECU (MAIN) - BODY GROUND)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE