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Communication For Initializing Impossible

WARNING: This page is about a different car, the 2006 Subaru Outback and 2006 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

DETECTING CONDITION: 

Defective harness connector

TROUBLE SYMPTOM: 

Communication is impossible between the airbag control module and the Subaru Select Monitor.

WIRING DIAGRAM: 

Fig 1: Communication For Initializing Impossible - Wiring Diagram
G05020574
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 the airbag mode using the Subaru Select Monitor.
2 CHECK BATTERY. 
  1. Turn the ignition switch to OFF.
  2. 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. 
  1. Turn the ignition switch to ON.
  2. Using the Subaru Select Monitor, check whether communication to other system can be executed normally.
 Are the system name and model year displayed on Subaru Select Monitor? Go to step 9.  Go to step 5. 
5 CHECK AIRBAG CONTROL MODULE CONNECTOR. 
  1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait more than 20 seconds.
  2. Confirm that the connector of airbag control module (AB6) is securely connected.
 Is the connector of the airbag control module securely connected? Go to step 6.  Connect the connector of the airbag control module.
6 CHECK SUBARU SELECT MONITOR COMMUNICATION. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the airbag control module connector.
  3. Turn the ignition switch to ON.
  4. Check whether communication to other systems can be executed normally.
 Are the system name and model year displayed on Subaru Select Monitor? Replace the airbag control module. < Ref. to AIRBAG CONTROL MODULE . > Go to step 7. 
7 CHECK HARNESS CONNECTOR BETWEEN EACH CONTROL MODULE AND DATA LINK CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the airbag control module, ABSCM&H/U, ECM and TCM.
  3. Measure the resistance between data link connector and chassis ground.

    Connector & terminal 

    (B40) No. 10 - Chassis ground: 

 Is the resistance more than 1 MΩ? Go to step 8.  Repair the harness and connector between each control module and data link connector. (Replace the harness without repairing the airbag harness.)
8 CHECK OUTPUT SIGNAL TO THE AIRBAG CONTROL MODULE. 
  1. Turn the ignition switch to ON in the condition of step 7.
  2. Measure the voltage between data link connector and chassis ground.

    Connector & terminal 

    (B40) No. 10(+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 9.  Repair the harness and connector between each control module and data link connector. (Replace the harness without repairing the airbag harness.)
9 CHECK THE HARNESS BETWEEN THE AIRBAG CONTROL MODULE AND DATA LINK CONNECTOR. 
  1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait more than 20 seconds.
  2. Disconnect the connector (AB6) from airbag control module.
  3. Connect the connector (1U) in the test harness U to connector (AB6).
  4. Measure the resistance between connector (4U) in the test harness U and the data link connector.

    Connector & terminal 

    (4U) No. 18 - (B40) No. 10: 

 Is the resistance less than 10 Ω? Go to step 10.  Repair the harness between the airbag control module and the data link connector. Or replace the airbag main harness along with the bulkhead harness.
10 CHECK POWER SUPPLY CIRCUIT. 
  1. Turn the ignition switch to ON.
  2. Measure the voltage between connector (2U) in the test harness U and chassis ground.

    Connector & terminal 

    (2U) No. 1 - Chassis ground: 

    (2U) No. 6 - Chassis ground: 

 Is the voltage more than 10 V? Go to step 11.  Repair the harness between the airbag control module and the battery. Or replace the airbag main harness along with the bulkhead harness.
11 CHECK BETWEEN THE AIRBAG CONTROL MODULE AND CHASSIS GROUND. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance between connector (2U) in the test harness U and chassis ground.

    Connector & terminal 

    (2U) No. 10 - Chassis ground: 

    (2U) No. 11 - Chassis ground: 

 Is the resistance less than 10 Ω? Go to step 12.  Repair the harness between the airbag control module and the chassis ground. Or replace the airbag main harness along with the bulkhead harness.
12 CHECK POOR CONTACT IN CONNECTOR.  Is there poor contact in the control module power supply, ground circuit and data link connector? Repair the connector. (For airbag system connectors, do not repair but replace the entire harness.) Replace the only airbag control module. < Ref. to REMOVAL , Airbag Control Module. >
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