Communication For Initializing Impossible

DETECTING CONDITION:

Defective harness connector

TROUBLE SYMPTOM:

Communication is impossible between ABS and Subaru Select Monitor.

WIRING DIAGRAM:

Fig 1: Identifying Wiring Diagram

G03808492

Courtesy of SUBARU OF AMERICA, INC.

STEP CHART

Step	Check	Yes	No
1 CHECK IGNITION SWITCH.	Does the ignition switch turn to ON?	Go to step 2 .	Turn the ignition switch to ON, and select ABS mode using Subaru Select Monitor.
2 CHECK BATTERY. Turn the ignition switch to OFF. Measure the battery voltage.	Is the voltage more than 11 V?	Go to step 3 .	Charge or replace the battery.
3 CHECK BATTERY TERMINAL.	Is there poor contact at battery terminal?	Repair or tighten the battery terminal.	Go to step 4 .
4 CHECK SUBARU SELECT MONITOR COMMUNICATION. Turn the ignition switch to ON. Using Subaru Select Monitor, check whether communication to other system can be executed normally.	Is the system name and model year displayed on Subaru Select Monitor?	Go to step 8 .	Go to step 5 .
5 CHECK SUBARU SELECT MONITOR COMMUNICATION. Turn the ignition switch to OFF. Disconnect the ABS CM & H/U connector. Turn the ignition switch to ON. Check whether communication to other systems can be executed normally.	Is the system name and model year displayed on Subaru Select Monitor?	Replace ABS CM & H/U. < Ref. to ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABS CM & H/U) . >	Go to step 6 .
6 CHECK HARNESS CONNECTOR BETWEEN EACH CONTROL MODULE AND DATA LINK CONNECTOR. Turn the ignition switch to OFF. Disconnect ABS CM & H/U, ECM and TCM. Measure the resistance between data link connector and chassis ground. Connector & terminal (B40) No. 10 - Chassis ground:	Is the resistance more than 1 Mohm?	Go to step 7 .	Repair harness and connector between each control module and data link connector.
7 CHECK OUTPUT SIGNAL FOR ABS CM & H/U. Turn the ignition switch to ON. Measure the voltage between ABS CM & H/U and chassis ground. Connector & terminal (B40) No. 10 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Go to step 8 .	Repair harness and connector between each control module and data link connector.
8 CHECK HARNESS CONNECTOR BETWEEN ABS CM & H/U AND DATA LINK CONNECTOR. Measure the resistance between ABS CM & H/U connector and data link connector. Connector & terminal (B301) No. 7-(B40) No. 10:	Is the resistance less than 0.5 ohm?	Go to step 9 .	Repair harness and connector between ABS CM & H/U and data link connector.
9 CHECK INSTALLATION OF ABS CM & H/U CONNECTOR. Turn the ignition switch to OFF.	Is the ABS CM & H/U connector inserted into ABS CM & H/U until it is locked by clamps?	Go to step 10 .	Insert ABS CM & H/U connector into ABS CM & H/U.
10 CHECK POWER SUPPLY CIRCUIT. Turn the ignition switch to ON. (engine OFF) Measure the ignition power supply voltage between ABS CM & H/U connector and chassis ground. Connector & terminal (B301) No. 18 (+) - Chassis ground (-):	Is the voltage 10 - 15 V?	Go to step 11 .	Repair open circuit in harness between ABS CM & H/U and battery.
11 CHECK HARNESS CONNECTOR BETWEEN ABS CM & H/U AND CHASSIS GROUND. Turn the ignition switch to OFF. Disconnect the connector from ABS CM & H/U. Measure the resistance of harness between ABS CM & H/U and chassis ground. Connector & terminal (B301) No. 15 - Chassis ground:	Is the resistance less than 0.5 ohm?	Go to step 12 .	Repair open circuit in harness between ABS CM & H/U and inhibitor side connector, and poor contact in coupling connector.
12 CHECK POOR CONTACT IN CONNECTOR.	Is there poor contact in control module power supply, ground circuit and data link connector?	Repair the connector.	Replace the ABSCM only. < Ref. to REPLACEMENT , ABS Control Module and Hydraulic Control Unit (ABS CM & H/U). >