Communication For Initializing Impossible: Wiring Diagram

Fig 1: Communication For Initializing Impossible - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE CHART

Step	Check	Yes	No
1 CHECK IGNITION SWITCH.	Is the ignition switch 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 11 V or more?	Go to step 3 .	Charge or replace the battery.
3 CHECK BATTERY TERMINAL .	Is there poor contact at the 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 the Subaru Select Monitor, check whether communication to other systems can be executed normally.	Are 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 ABSCM & H/U connectors. Turn the ignition switch to ON. Check whether communication to other systems can be executed normally.	Are the system name and model year displayed on Subaru Select Monitor?	Replace the ABSCM & H/U. <Ref. to ABS Control Module and Hydraulic Control Unit (ABSCM & 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 the ABSCM & H/U, ECM and TCM. Measure the resistance between data link connector and chassis ground. Connector & terminal (B40) No. 7 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 7 .	Repair the harness and connector between each control module and data link connector.
7 CHECK OUTPUT SIGNAL FOR ABSCM & H/U. Turn the ignition switch to ON. Measure the voltage between ABSCM & H/U connector and chassis ground. Connector & terminal (B40) No. 7 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Go to step 8 .	Repair the harness and connector between each control module and data link connector.
8 CHECK HARNESS CONNECTOR BETWEEN ABSCM & H/U AND DATA LINK CONNECTOR. Measure the resistance between ABSCM & H/U connector and data link connector. Connector & terminal (B301) No. 7 - (B40) No. 7:	Is the resistance less than 0.5 Ω?	Go to step 9 .	Repair harness and connector between ABSCM & H/U and data link connector.
9 CHECK INSTALLATION OF ABSCM & H/U CONNECTOR. Turn the ignition switch to OFF.	Is the ABSCM & H/U connector inserted into ABSCM & H/U until the clamp locks onto it?	Go to step 10 .	Insert ABSCM & H/U connector into ABSCM & H/U.
10 CHECK POWER SUPPLY CIRCUIT. Turn the ignition switch to ON. (Engine OFF) Measure the ignition power supply voltage between ABSCM & 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 of harness between ABSCM & H/U and battery.
11 CHECK HARNESS CONNECTOR BETWEEN ABSCM & H/U AND CHASSIS GROUND. Turn the ignition switch to OFF. Disconnect the ABSCM & H/U connectors. Measure the resistance of the harness between ABSCM & H/U and chassis ground. Connector & terminal (B301) No. 15 - Chassis ground:	Is the resistance less than 0.5 Ω?	Go to step 12 .	Repair the open circuit of the harness between ABSCM & H/U and inhibitor side connector, and poor contact of coupling connector.
12 CHECK POOR CONTACT OF 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 (ABSCM & H/U). >