WIRING DIAGRAM
Ref. to SYSTEM WIRING DIAGRAMS , CAN Communication System .
Scheme 15
Scheme 16
- Prepare the Subaru Select Monitor kit. Ref. to «PREPARATION TOOL»(ref-357102-S18359317812010030800000) , General Description.
- Prepare the personal computer which has been installed the Subaru Select Monitor.
- Connect the USB cable between SDI (Subaru Diagnosis Interface) and USB port on the personal computer (dedicated port for the Subaru Select Monitor). NOTE: The dedicated port for the Subaru Select Monitor means the USB port which was used to install the Subaru Select Monitor.
- Connect the diagnosis cable to SDI.
- Connect the SDI to data link connector located in the lower portion of the instrument panel (on the driver's side).
- Start a PC.
- Turn the ignition switch to ON (engine OFF), and run the "PC application for Subaru Select Monitor".
- Call up DTC and data, then record them. NOTE: For detailed operation procedure, refer to the "PC application help for Subaru Select Monitor".
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is B1102 current malfunction? | Go to step 2. | Go to step 5. |
| 2 CHECK DTC. Turn the ignition switch to OFF. Disconnect the connector from body integrated unit and reconnect. Wait approx. 2 minutes. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is B1102 current malfunction? | Go to step 3. | Go to step 5. |
| 3 CHECK FUSE. Turn the ignition switch to OFF. Inspect the fuse. | Is the fuse OK? | Go to step 4. | Replace the defective fuse. |
| 4 CHECK HARNESS. Disconnect the body integrated unit connector (B281). Measure the voltage between body integrated unit connector and chassis ground using tester. Connector & terminal (B281) No. 2 (+) - Chassis ground (-) | Is the voltage 8.5 - 16.5 V? | Replace the body integrated unit. Ref. to REMOVAL , Body Integrated Unit. | Repair or replace the open or shorted circuit between body integrated unit and fuse. |
| 5 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the body integrated unit connector (B280). | Is there poor contact of connector? | Repair or replace the poor contact of connector. | A temporary change of voltage occurred. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is B1104 current malfunction? | Go to step 2. | Go to step 5. |
| 2 CHECK DTC. Turn the ignition switch to OFF. Disconnect the connector from body integrated unit and reconnect. Turn the ignition switch to ACC. Wait approx. 2 minutes. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is B1104 current malfunction? | Go to step 3. | Go to step 5. |
| 3 CHECK FUSE. Turn the ignition switch to OFF. Inspect the fuse. | Is the fuse OK? | Go to step 4. | Replace the defective fuse. |
| 4 CHECK HARNESS. Disconnect the body integrated unit connector (B279). Turn the ignition switch to ACC. Measure the voltage between body integrated unit connector and chassis ground using tester. Connector & terminal (B280) No. 7 (+) - Chassis ground (-) | Is the voltage 8.5 - 16.5 V? | Replace the body integrated unit. Ref. to REMOVAL , Body Integrated Unit. | Repair or replace the open or shorted circuit between body integrated unit and fuse. |
| 5 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the body integrated unit connector (B280). | Is there poor contact of connector? | Repair or replace the poor contact of connector. | A temporary change of voltage occurred. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Using the Subaru Select Monitor, confirm all DTCs. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is any DTC other than for the body integrated unit displayed? | Perform the diagnosis according to displayed DTC. | Go to step 2. |
| 2 CHECK DTC. Turn the ignition switch to OFF --> ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1202 a current malfunction? | Go to step 3. | Go to step 10. |
| 3 CHECK DTC. Turn the ignition switch to OFF. Disconnect all connectors (B280, B310, B136, B230, B231, B380) that are connected to high speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1202 a current malfunction? | Go to step 4. | Go to step 10. |
| 4 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect all connectors (B280, B310, B136, B230, B231, B380) that are connected to high speed CAN communication line. Using the tester, inspect the open circuit of harness and short (power supply-output short, GND-output short). Connector & terminal (B40) No. 6 - (B136) No. 27: (B40) No. 6 - (B310) No. 35: (B40) No. 6 - (B230) No. 2: (B40) No. 6 - (B231) No. 2: (B40) No. 6 - (B380) No. 2: (B40) No. 6 - (B280) No. 3 | Is harness normal? | Go to step 5. | Repair or replace the harness. |
| 5 CHECK HARNESS. Using the tester, inspect the open circuit of harness and short (power supply-output short, GND-output short). Connector & terminal (B40) No. 14 - (B136) No. 35: (B40) No. 14 - (B310) No. 10: (B40) No. 14 - (B230) No. 3: (B40) No. 14 - (B231) No. 1: (B40) No. 14 - (B380) No. 18: (B40) No. 14 - (B280) No. 9 | Is harness normal? | Go to step 6. | Repair or replace the harness. |
| 6 CHECK ECM. Connect the ECM. Using the tester, measure the resistance between terminals of data link connector. Connector & terminal (B40) No. 6 - No. 14 | Is the resistance 120±5 ohms? | Go to step 7. | Replace the ECM. Ref. to REMOVAL , Engine Control Module (ECM). |
| 7 CHECK VDC/ABS CM. Disconnect the ECM connector (B136). Connect the VDC/ABS CM. Using the tester, measure the resistance between terminals of data link connector. Connector & terminal (B40) No. 6 - No. 14 | Is the resistance 120±5 n? | Go to step 8. | Replace the VDC/ABS CM. Ref. to REMOVAL , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). |
| 8 CHECK HARNESS. Connect the disconnected connectors. Using the tester, measure the resistance between terminals of data link connector and chassis ground. Connector & terminal (B40) No. 6 - Chassis ground: (B40) No. 14 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 9. | Go to step 12. |
| 9 CHECK HARNESS. Turn the ignition switch to ON. Using the tester, measure the voltage between terminals of data link connector and chassis ground. Connector & terminal (B40) No. 6 (+) - Chassis ground (-): (B40) No. 14 (+) - Chassis ground (-) | Is the voltage 6 V or more? | Go to step 13. | Replace the body integrated unit. Ref. to REMOVAL , Body Integrated Unit. |
| 10 CHECK HARNESS. Shake the harness. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1202 a current malfunction? | Repair or replace the harness. | Go to step 11. |
| 11 CHECK CONNECTOR. Disconnect the connector used for high speed CAN circuit. | Is there poor contact of connector terminal? | Repair the connector terminal, or replace harness. | It is possible that temporary poor contact occurs. |
| 12 CHECK CONTROL MODULE. With the tester connected, disconnect each control module connector. | Is there any control module whose resistance has changed? | Replace the control module whose resistance has changed. | Repair or replace the open or short circuit of the harness. |
| 13 CHECK ECM. With the tester connected, disconnect each control module connector. | Is there any control module whose voltage has changed? | Replace the control module whose voltage has changed. | Repair or replace the short circuit of the harness. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is there DTC U1202? | Perform the diagnosis according to DTC. | Go to step 2. |
| 2 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1211 a current malfunction? | Go to step 3. | Go to step 4. |
| 3 CHECK ECM. Turn the ignition switch to OFF. Disconnect the connector from ECM. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1211 a current malfunction? | Replace the ECM. Ref. to REMOVAL , Engine Control Module (ECM). | Go to step 4. |
| 4 CHECK HARNESS. Shake the harness used for CAN communication circuit. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1211 a current malfunction? | Repair the poor contact or temporary open circuit of harness. | Go to step 5. |
| 5 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector that is connected to high speed CAN circuit. | Is there poor contact of connector? | Repair the connector terminal where poor contact exists, or replace harness. | It is possible that temporary poor contact occurs. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is there DTC U1202? | Perform the diagnosis according to DTC. | Go to step 2. |
| 2 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1213 a current malfunction? | Go to step 3. | Go to step 4. |
| 3 CHECK DTC. Turn the ignition switch to OFF. Disconnect the VDC/ABS CM connector. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1213 a current malfunction? | Replace the VDC/ABS CM. Ref. to REMOVAL , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). | Go to step 4. |
| 4 CHECK HARNESS. Turn the ignition switch to OFF. Shake the harness used for CAN communication circuit. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1213 a current malfunction? | Repair or replace the harness. | Go to step 5. |
| 5 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector that is connected to high speed CAN circuit. | Is there poor contact of connector terminal? | Repair the connector terminal, or replace harness. | It is possible that temporary poor communication occurs. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is there DTC U1202? | Perform the diagnosis according to DTC. | Go to step 2. |
| 2 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1216 a current malfunction? | Go to step 3. | Go to step 4. |
| 3 CHECK DTC. Turn the ignition switch to OFF. Disconnect the DCCD CM connector. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1216 a current malfunction? | Replace the DCCD CM. Ref. to REMOVAL , Driver's Control Center Differential Control Module. | Go to step 4. |
| 4 CHECK HARNESS. Turn the ignition switch to OFF. Shake the harness used for CAN communication circuit. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1216 a current malfunction? | Repair or replace the harness. | Go to step 5. |
| 5 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector that is connected to high speed CAN circuit. | Is there poor contact of connector terminal? | Repair the connector terminal, or replace harness. | Temporary poor contact occurs. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is there DTC U1202? | Perform the diagnosis according to DTC. | Go to step 2. |
| 2 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1221 a current malfunction? | Go to step 3. | Go to step 8. |
| 3 CHECK DTC. Turn the ignition switch to OFF. Disconnect all connectors (B280, B310, B136, B230, B231, B380) that are connected to high speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1221 a current malfunction? | Go to step 4. | Go to step 8. |
| 4 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect all connectors (B280, B310, B136, B230, B231, B380) that are connected to high speed CAN communication line. Using the tester, inspect the open circuit of harness and short (power supply-output short, GND-output short). Connector & terminal (B40) No. 6 - (B136) No. 27: (B40) No. 6 - (B310) No. 35: (B40) No. 6 - (B230) No. 2: (B40) No. 6 - (B231) No. 2: (B40) No. 6 - (B380) No. 2: (B40) No. 6 - (B280) No. 3 | Is harness normal? | Go to step 5. | Repair or replace the harness. |
| 5 CHECK HARNESS. Using the tester, inspect the open circuit of harness and short (power supply-output short, GND-output short). Connector & terminal (B40) No. 14 - (B136) No. 35: (B40) No. 14 - (B310) No. 10: (B40) No. 14 - (B230) No. 3: (B40) No. 14 - (B231) No. 1: (B40) No. 14 - (B380) No. 18: (B40) No. 14 - (B280) No. 9 | Is harness normal? | Go to step 6. | Repair or replace the harness. |
| 6 CHECK DTC. Turn the ignition switch to OFF. Connect the disconnected connectors. Start the engine. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1221 a current malfunction? | Go to step 7. | Go to step 8. |
| 7 CHECK DTC. Read all DTCs using the Subaru Select Monitor. | Are DTCs P1718 or P0044, P0045, P0140 detected? | Replace the ECM. Ref. to REMOVAL , Engine Control Module (ECM). | Replace the body integrated unit. Ref. to REMOVAL , Body Integrated Unit. |
| 8 CHECK HARNESS. Turn the ignition switch to OFF. Shake the harness used for CAN communication circuit. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1221 a current malfunction? | Repair or replace the harness. | Go to step 9. |
| 9 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect all the connector that is connected to high speed CAN circuit. | Is there poor contact of connector terminal? | Repair the connector terminal where poor contact exists, or replace harness. | Temporary poor contact occurs. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is there DTC U1202? | Perform the diagnosis according to DTC. | Go to step 2. |
| 2 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1223 a current malfunction? | Go to step 3. | Go to step 7. |
| 3 CHECK DTC. Turn the ignition switch to OFF. Disconnect all connectors (B280, B310, B136, B230, B231, B380) that are connected to high speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1223 a current malfunction? | Go to step 4. | Go to step 7. |
| 4 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect all connectors (B280, B310, B136, B230, B231, B380) that are connected to high speed CAN communication line. Using the tester, inspect the open circuit of harness and short (power supply-output short, GND-output short). Connector & terminal (B40) No. 6 - (B310) No. 35: (B40) No. 14 - (B310) No. 10 | Is harness normal? | Go to step 5. | Repair or replace the harness. |
| 5 CHECK DTC. Connect the disconnected connectors. Start the engine. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1223 a current malfunction? | Go to step 6. | Go to step 7. |
| 6 CHECK DTC. Read all DTCs using the Subaru Select Monitor. | Is P1718 or P0600 displayed? | Replace the VDC/ABS CM. Ref. to REMOVAL , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). | Replace the body integrated unit. Ref. to REMOVAL , Body Integrated Unit. |
| 7 CHECK HARNESS. Shake the harness used for CAN communication circuit. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1223 a current malfunction? | Repair or replace the harness. | Go to step 8. |
| 8 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect all connectors (B280, B310, B136, B230, B231, B380) that are connected to high speed CAN communication line. | Is there connector terminal where poor contact exists? | Repair the connector terminal where poor contact exists, or replace harness. | Temporary poor contact occurs. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is there DTC U1202? | Perform the diagnosis according to DTC. | Go to step 2. |
| 2 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1226 a current malfunction? | Go to step 3. | Go to step 7. |
| 3 CHECK DTC. Turn the ignition switch to OFF. Disconnect all connectors (B280, B310, B136, B230, B231, B380) that are connected to high speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1226 a current malfunction? | Go to step 4. | Go to step 7. |
| 4 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect all connectors (B280, B310, B136, B230, B231, B380) that are connected to high speed CAN communication line. Using the tester, inspect the open circuit of harness and short (power supply-output short, GND-output short). Connector & terminal (B380) No. 18 - (B40) No. 14: (B380) No. 2 - (B40) No. 6 | Is harness normal? | Go to step 5. | Repair or replace the harness. |
| 5 CHECK DTC. Connect the disconnected connectors. Start the engine and stop. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1226 a current malfunction? | Go to step 6. | Go to step 7. |
| 6 CHECK DTC. Using the Subaru Select Monitor, read all DTCs. | Are DTCs P0600 or P0044, P0045, C0140 displayed? | Replace the DCCD CM. Ref. to REMOVAL , Driver's Control Center Differential Control Module. | Replace the body integrated unit. Ref. to REMOVAL , Body integrated Unit. |
| 7 CHECK HARNESS. Shake the harness used for CAN communication circuit. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1226 a current malfunction? | Repair or replace the harness. | Go to step 8. |
| 8 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect all the connector that is connected to high speed CAN circuit. | Is there poor contact of connector terminal? | Repair the connector terminal where poor contact exists, or replace harness. | Temporary poor contact occurs. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Are there DTC U1300 or U1302? | Perform the diagnosis according to DTC. | Go to step 2. |
| 2 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1301 current malfunction? | Go to step 3. | Go to step 9. |
| 3 CHECK DTC. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1301 current malfunction? | Go to step 4. | Go to step 9. |
| 4 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Using the tester, inspect the open circuit of harness and short (power supply-output short, GND-output short). Connector & terminal (i84) No. 1 - (i10) No. 27 (combination meter): (i84) No. 9 - (i10) No. 26 (combination meter): (i84) No. 1 - (i88) No. 20 (auto A/C): (i84) No. 9 - (i88) No. 19 (auto A/C): (i84) No. 1 - (i85) No. 12 (audio): (i84) No. 9 - (i85) No. 11 (audio): (i84) No. 1 - (i50) No. 18 (navigation): (i84) No. 9 - (i50) No. 6 (navigation) | Is harness normal? | Go to step 5. | Repair or replace the harness. |
| 5 CHECK AUDIO OR NAVIGATION. Connect the disconnected connectors. Disconnect the connector of navigation (i85) or audio (i50). Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1301 current malfunction? | Go to step 6. | Go to step 9. |
| 6 CHECK AUTO A/C CONTROL MODULE. Turn the ignition switch to OFF. Connect the audio or navigation module. Disconnect the auto A/C control module connector (i88). Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1301 current malfunction? | Go to step 7. | Replace the auto A/C control module. Ref. to REMOVAL , Control Unit (Auto A/C Model). |
| 7 CHECK COMBINATION METER. Turn the ignition switch to OFF. Connect the disconnected connectors. Perform the self-diagnosis of combination meter. Ref. to SELF-DIAGNOSIS , INSPECTION, Combination Meter System. | Is the self-diagnosis of combination meter OK? | Go to step 8. | Replace the combination meter. Ref. to REMOVAL , Combination Meter. |
| 8 CHECK BODY INTEGRATED UNIT. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is DTC U1301 a current malfunction? | Replace the body integrated unit. Ref. to REMOVAL , Body integrated Unit. | Go to step 9. |
| 9 CHECK HARNESS. Turn the ignition switch to OFF. Shake the harness used for low speed CAN communication circuit. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1301 current malfunction? | Repair or replace the harness. | Go to step 10. |
| 10 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. | Is there poor contact of connector terminal? | Repair the connector terminal, or replace harness. | Temporary poor contact occurs. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is U1302 a current malfunction? | Go to step 2. | Go to step 8. |
| 2 CHECK DTC. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1302 a current malfunction? | Go to step 3. | Go to step 8. |
| 3 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Using the tester, inspect the open circuit of harness and short (power supply-output short, GND-output short). Connector & terminal (i84) No. 1 - (i10) No. 27 (combination meter): (i84) No. 9 - (i10) No. 26 (combination meter): (i84) No. 1 - (i88) No. 20 (auto A/C): (i84) No. 9 - (i88) No. 19 (auto A/C): (i84) No. 1 - (i85) No. 12 (audio): (i84) No. 9 - (i85) No. 11 (audio): (i84) No. 1 - (i50) No. 18 (navigation): (i84) No. 9 - (i50) No. 6 (navigation) | Is harness normal? | Go to step 4. | Repair or replace the harness. |
| 4 CHECK HARNESS. Connect the disconnected connectors. Using the tester, measure the resistance between harness connector and chassis ground. Connector & terminal (i84) No. 1 - Chassis ground: (i84) No. 9 - Chassis ground | Is the resistance 1 Mohms or more? | Go to step 5. | Go to step 7. |
| 5 CHECK HARNESS. Turn the ignition switch to ON. Using the tester, measure the voltage between harness connector and chassis ground. Connector & terminal (i84) No. 1 - Chassis ground: (i84) No. 9 - Chassis ground | Is the voltage less than 6 V? | Replace the body integrated unit. Ref. to REMOVAL , Body Integrated Unit. | Go to step 6. |
| 6 CHECK HARNESS. With the tester connected, disconnect control module. | Is there any control module that the voltage becomes 6 V or less. | Replace the control module whose voltage has changed. | Repair or replace the short circuit of the harness. |
| 7 CHECK HARNESS. With the tester connected, disconnect control module. | Is there any control module whose resistance has changed? | Replace the control module whose resistance has changed. | Repair or replace the short circuit of the harness. |
| 8 CHECK HARNESS. Shake the harness used for low speed CAN communication circuit. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1302 a current malfunction? | Repair or replace the open, short circuit of the harness. | Go to step 9. |
| 9 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. | Is there poor contact of connector terminal? | Repair the connector terminal, or replace harness. | Temporary poor contact occurs. |
DIAGNOSIS PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK ALL DTCS. Read all DTCs using the Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) , OPERATION, Subaru Select Monitor. | Is DTC U1300 or U1302 displayed? | Perform the diagnosis according to DTC. | Go to step 2. |
| 2 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1321 a current malfunction? | Go to step 3. | Go to step 7. |
| 3 CHECK DTC. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1321 a current malfunction? | Go to step 4. | Replace the combination meter. Ref. to REMOVAL , Combination Meter. |
| 4 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Using the tester, inspect the open circuit of harness and short (power supply-output short, GND-output short). Connector & terminal (i84) No. 1 - (i10) No. 27 (combination meter): (i84) No. 9 - (i10) No. 26 (combination meter): (i84) No. 1 - (i88) No. 20 (auto A/C): (i84) No. 9 - (i88) No. 19 (auto A/C): (i84) No. 1 - (i85) No. 12 (audio): (i84) No. 9 - (i85) No. 11 (audio): (i84) No. 1 - (i50) No. 18 (navigation): (i84) No. 9 - (i50) No. 6 (navigation) | Is harness normal? | Go to step 5. | Repair or replace the harness. |
| 5 CHECK COMBINATION METER. Connect the disconnected connectors. Perform the self-diagnosis of combination meter. Ref. to SELF-DIAGNOSIS , INSPECTION, Combination Meter System. | Is the self-diagnosis OK? | Go to step 6. | Replace the combination meter. Ref. to REMOVAL , Combination Meter. |
| 6 CHECK DTC. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1321 a current malfunction? | Replace the body integrated unit. Ref. to REMOVAL , Body Integrated Unit. | Go to step 7. |
| 7 CHECK DTC. Shake the harness used for low speed CAN communication circuit. Read the DTC of body integrated unit using Subaru Select Monitor. | Is U1321 a current malfunction? | Repair the poor contact, open circuit of harness or replace harness. | Go to step 8. |
| 8 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. | Is there poor contact of connector terminal? | Repair the connector terminal, or replace harness. | It is possible that temporary poor communication occurs. |
DIAGNOSIS PROCEDURE