Main Body ECU Power Source Circuit

WIPER AND WASHER: WIPER AND WASHER SYSTEM: Main Body ECU Power Source Circuit

Main Body ECU Power Source Circuit

DESCRIPTION

This circuit supplies power to operate the Multiplex Network Body ECU No. 2.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT MULTIPLEX NETWORK BODY ECU NO. 2 (BECU, SIG, W, GND, SG)





(a) Disconnect the connector from multiplex body ECU No. 2.
(b) Check that there is continuity between terminal GND, SG on the wire harness side and body ground.
Standard:
Continuity
(c) Measure the voltage terminal BECU on the wire harness side and body ground.
Standard voltage:
10 to 14 V
(d) Turn the ignition switch to ON.
(e) Measure the voltage terminal SIG, W on the wire harness side and body ground.
Standard voltage:
10 to 14 V
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR
(a) Check for open and short circuit in the harness and the connector between the multiplex network body ECU No. 2 and body ground.
(b) Check for open and short circuit in the harness and the connector between the multiplex network body ECU No. 2 and battery.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE