THEFT DETERRENT SYSTEM > ECU Power Source Circuit

for Preparation Click here


DESCRIPTION

This circuit provides power for main body ECU operation.

WIRING DIAGRAM


B214314E01


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK)
B214315E01

  1. Disconnect the 3B and 3A junction connectors.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    3B-37 - Body ground
    		Always
    		11 to 14 V
    3A-1 - Body ground
    		Always
    		11 to 14 V

Text in Illustration 
*1
Front view of wire harness connector
(to Instrument Panel Junction Block)
*2
Front view of wire harness connector
(to Instrument Panel Junction Block)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BODY GROUND)


    B214316E01

  1. Disconnect the 3D junction block connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3D-5 - Body ground
    		Always
    		Below 1 Ω

Text in Illustration 
*1
Front view of wire harness connector
(to Instrument Panel Junction Block)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK INSTRUMENT PANEL JUNCTION BLOCK (POWER SOURCE, BODY GROUND)

  1. Reconnect the 3A, 3B, and 3D junction block connectors.


B214317E01


Text in Illustration 
*1
Component without main body ECU
(Instrument Panel Junction Block)

  1. Remove the main body ECU (Click here).

  1. Measure the voltage and resistance according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    3F-30 (ECUB) - Body ground
    		Always
    		11 to 14 V
    3F-31 (ALTB) - Body ground
    		Always
    		11 to 14 V

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3F-11 (GND1) - Body ground
    		Always
    		Below 1 Ω



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)