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Diagnostic Procedure

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK DTC. 
Read all DTCs using the Subaru Select Monitor.< Refer to OPERATION , Subaru Select Monitor. >		 Are there U1202 or DTCs other than for the body integrated unit? Perform the diagnosis according to DTC. Go to step 2  .
2 CHECK DTC. 
Check DTC indicated by body integrated unit.		 Is U1201 a current malfunction? Go to step 3  . Go to step 14  .
3 CHECK DTC. 
  1. Turn the ignition switch to OFF.
  2. Disconnect all control module connectors (B280, B310, B55, B136, B230, B231) that are connected to high speed CAN communication line.
  3. Connect all the disconnected connectors.
  4. Turn the ignition switch to ON.
  5. Read the DTC of body integrated unit using Subaru Select Monitor.
 Is U1201 a current malfunction? Go to step 4  . Go to step 14  .
4 CHECK TCM. 
NOTE: If the vehicle is MT model, go to the next step.

  1. Turn the ignition switch to OFF.
  2. Disconnect the TCM connector (B55).
  3. Turn the ignition switch to ON.
  4. Read the DTC of body integrated unit using Subaru Select Monitor.
 Is U1201 a current malfunction? Go to step 5  . Go to step 16  .
5 CHECK STEERING ANGLE SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Connect the TCM connector.
  3. Disconnect the steering angle sensor connector (B231).
  4. Turn the ignition switch to ON.
  5. Read the DTC of body integrated unit using Subaru Select Monitor.
 Is U1201 a current malfunction? Go to step 6  . Go to step 17  .
6 CHECK YAW RATE SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Connect the steering angle sensor connector.
  3. Disconnect the yaw rate sensor connector (B230).
  4. Turn the ignition switch to ON.
  5. Read the DTC of body integrated unit using Subaru Select Monitor.
 Is U1201 a current malfunction? Go to step 7  . Go to step 18  .
7 CHECK VDC/ABS CM. 
  1. Turn the ignition switch to OFF.
  2. Connect the yaw rate sensor connector.
  3. Disconnect the VDC/ABS CM connector (B310).
  4. Install the 120 Ω resistance to VDC/ABS CM connector terminals.

    Terminals 

    (B310) No. 10 - No. 35: 

  5. Using the tester, measure the resistance between terminals of data link connector.

    Terminals 

    (B40) No. 6 - No. 14: 

 Is the resistance 60 Ω? Go to step 8  . Go to step 10  .
8 CHECK DTC. 
Read the DTC of body integrated unit using Subaru Select Monitor.		 Is U1201 a current malfunction? Go to step 9  . Go to step 10  .
9 CHECK DTC. 
Read the DTC of body integrated unit using Subaru Select Monitor.		 Is U1202 a current malfunction? Replace the VDC/ABS CM.< Refer to REMOVAL , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). > Go to step 10  .
10 CHECK ECM. 
  1. Turn the ignition switch to OFF.
  2. Connect the VDC/ABS CM.
  3. Disconnect the ECM connector (B136).
  4. Install the 120 Ω resistance to ECM connector.

    Terminals 

    (B136) No. 17 - No. 28: 

  5. Using the tester, measure the resistance between terminals of data link connector.

    Connector & terminal 

    (B40) No. 6 - No. 14: 

 Is the resistance 60 Ω? Go to step 11  . Repair or replace the open circuit of harness.
11 CHECK DTC. 
Read the DTC of body integrated unit using Subaru Select Monitor.		 Is U1201 a current malfunction? Go to step 12  . Go to step 13  .
12 CHECK DTC. 
Read the DTC of body integrated unit using Subaru Select Monitor.		 Is U1202 a current malfunction? Replace the ECM.< Refer to REMOVAL , Engine Control Module (ECM). > Go to step 13  .
13 CHECK DTC. 
  1. Turn the ignition switch to OFF.
  2. Reconnect all the disconnected connectors.
  3. Turn the ignition switch to ON.
  4. Read the DTC of body integrated unit using Subaru Select Monitor.
 Is U1201 a current malfunction? Replace the body integrated unit.< Refer to REMOVAL , Body Integrated Unit. > Go to step 14  .
14 CHECK HARNESS. 
  1. Shake the instrument harness and bulkhead harness, rear harness.
  2. Read the DTC of body integrated unit using Subaru Select Monitor.
 Is U1201 a current malfunction? Repair or replace the harness. Go to step 15  .
15 CHECK CONNECTOR. 
  1. Disconnect the connector used for CAN circuit.
  2. Check the connector terminal.
 Is there poor contact of connector terminal? Repair the connector terminal where poor contact exists, or replace harness. It is possible that temporary poor communication occurs.
16 CHECK HARNESS. 
Using the tester, check for open or short (power supply-output short, GND-output short) in the harness between terminals of data link connector and TCM.
Connector & terminal 
(B40) No. 14 - (B55) No. 17: 
(B40) No. 6 - (B55) No. 18: 		 Is harness normal? Replace the TCM.< Refer to REMOVAL , Transmission Control Module (TCM). > Repair or replace the harness.
17 CHECK HARNESS. 
Using the tester, check for open or short (power supply-output short, GND-output short) in the harness between terminals of data link connector and steering angle sensor.
Connector & terminal 
(B40) No. 14 - (B231) No. 1: 
(B40) No. 6 - (B231) No. 2: 		 Is harness normal? Replace the steering angle sensor.< Refer to REPLACEMENT , Steering Angle Sensor. > Repair or replace the harness.
18 CHECK HARNESS. 
Using the tester, check for open or short (power supply-output short, GND-output short) in the harness between terminals of data link connector and yaw rate sensor.
Connector & terminal 
(B40) No. 14 - (B230) No. 3: 
(B40) No. 6 - (B230) No. 2: 		 Is harness normal? Replace the yaw rate sensor.< Refer to REMOVAL , Yaw Rate and G Sensor. > Repair or replace the harness.
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