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Communication For Initializing Impossible

DETECTING CONDITION: 

Defective harness connector

TROUBLE SYMPTOM: 

Communication is impossible between occupant detection control module and Subaru Select Monitor.

WIRING DIAGRAM: 

Fig 1: Identifying Communication For Initializing Impossible - Wiring Diagram
G04995199Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE - COMMUNICATION FOR INITIALIZING IMPOSSIBLE

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 occupant detection system mode using 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 ON.
  2. Using the Subaru Select Monitor, check whether communication to other system can be executed normally.
 Are the system name displayed on Subaru Select Monitor? Go to step 8.  Go to step 5. 
5 CHECK OCCUPANT DETECTION CONTROL MODULE CONNECTOR. 
Turn the ignition switch to OFF.		 Is the occupant detection control module connectors and body harness connectors are connected securely? Go to step 6.  Connect the occupant detection control module connector and body harness connector.
6 CHECK SUBARU SELECT MONITOR COMMUNICATION. 
WARNING: 1) Turn the ignition switch to OFF.
  1. Disconnect the occupant detection control module connector.
  2. Turn the ignition switch ON.
  3. Check whether communication to other systems can be executed normally.
 Are the system name displayed on Subaru Select Monitor? Replace the seat cushion frame assembly. <Ref. to REMOVAL Front Seat. > 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 occupant detection control module connector (R212).
  3. Measure the resistance between data link connector and chassis ground.

    Connector & terminal 

    (B40) No. 10 - Chassis ground: 

 Is the resistance more than 1 Ω? Go to step 8.  Repair or replace the harness connector between each control module and data link connector. Replace the harness without repairing the air-bag harness.
8 CHECK THE OCCUPANT DETECTION SYSTEM CONTROL MODULE OUTPUT SIGNAL. 
  1. Turn the ignition switch ON.
  2. Measure the voltage between occupant detection control module and chassis ground.

    Connector & terminal 

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

 Is the voltage less than 1 V? Go to step 9.  Repair or replace the harness connector between each control module and data link connector. Replace the harness without repairing the air-bag harness.
9 CHECK HARNESS CONNECTOR BETWEEN OCCUPANT DETECTION CONTROL MODULE AND DATA LINK CONNECTOR. 
  1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for more than 20 seconds.
  2. Measure the resistance between occupant detection control module connector and data link connector.

    Connector & terminal 

    (R212) No. 2 - (B40) No. 10: 

 Is the resistance less than 10 Ω? Go to step 10  . Repair or replace the harness connector between occupant detection control module and data link connector.
10 CHECK POWER SUPPLY CIRCUIT. 
  1. Disconnect connector (AB53) from vehicle harness.
  2. Connect the test harness Z (AB53) to connector.
  3. Turn the ignition switch ON. (Engine OFF)
  4. Measure the voltage between connector (2Z) in the test harness Z and chassis ground.

    Connector & terminal 

    (2Z) No. 2 (+) - Chassis ground (-): 

 Is the voltage more than 10 V? Go to step 11  . Repair or replace the vehicle harness.
11 CHECK HARNESS CONNECTOR BETWEEN OCCUPANT DETECTION CONTROL MODULE AND CHASSIS GROUND. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance between connector (2Z) in the test harness Z and chassis ground.

    Connector & terminal 

    (2Z) No. 1 - Chassis ground: 

 Is the resistance less than 10 Ω? Go to step 12  . Repair or replace the body harness.
12 CHECK POOR CONTACT OF CONNECTORS.  Is there poor contact in the control module power supply, ground circuit and data link connector? Replace the airbag harness. Replace the seat cushion frame assembly. <Ref. to REMOVAL Front Seat. >
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