Home ReviewsRefund
Home/Subaru/Legacy/Subaru Legacy BL/BP рестайлинг (2006-2009)/Repair manual/Communication Devices/Lan System (Diagnostics): Diagnosis
Contents Section: Communication Devices All sections

Lan System (Diagnostics): Diagnosis Subaru Legacy BL/BP рестайлинг

Communication Devices 14 illustrations ~1316 words

INSPECTION

Before performing diagnostics, check the following item which might affect body integrated unit malfunctions.

  1. Measure the battery voltage and check electrolyte. Standard voltage: 12 V or more Specific gravity: Above 1.260
  2. Check the fuse condition. Make sure that ampere of the fuse is setting value, and it is not blown out.
  3. Check the connecting condition of harness and harness connector.
  4. Confirm that a setting that does not match the vehicle equipment, is not set in the body integrated unit. REGISTRATION BODY INTEGRATED UNIT (EQUIPMENT SETTING) .>
  5. Make sure that a setting that does not match the vehicle equipment, is not set in the function setting (ECM customizing) of the body integrated unit. FUNCTION SETTING (ECM CUSTOMIZING) .>
  6. Confirm "Factory initial setting" of body integrated unit registrations is "Market".
  7. Confirm key illumination does not blink with ignition switch turned to ON.

READ DIAGNOSTIC TROUBLE CODE (DTC)

Note. DTC is displayed in the sequence of inputting. (When entering two DTCs or more simultaneously, they are displayed in the sequence of priority.) When more than two DTCs are displayed, perform the diagnosis of top one.

Scheme 8

Scheme 8: READ DIAGNOSTIC TROUBLE CODE (DTC)
Scheme 8: READ DIAGNOSTIC TROUBLE CODE (DTC)
  1. Prepare the Subaru Select Monitor kit.
  2. Connect the diagnosis cable to the Subaru Select Monitor.
  3. Connect the Subaru Select Monitor to the data link connector. Data link connector is located in the lower portion of instrument panel (on the driver's side). CAUTION: Do not connect the scan tools except for Subaru Select Monitor.
  4. Turn the ignition switch to ON (engine OFF) and run the Subaru Select Monitor.
  5. On the «Main Menu» display screen, select {Each System Check}.
  6. On the «System Selection Menu» display screen, select the {Integ. unit mode}.
  7. On the «Integ. unit mode failure diag» display screen, select the {Diagnostic Code(s) Display}. NOTE: For details concerning operation procedures, refer to the "SUBARU SELECT MONITOR OPERATION MANUAL". For details concerning DTCs, refer to the List of Diagnostic Trouble Code (DTC). LIST OF DIAGNOSTIC TROUBLE CODE (DTC). >

DTC TABLE

Note. When more than two DTC codes are recorded, referring to their combination will make it easy to identify the possible cause. Refer to the list for typical examples.

DTC to CheckDiagnostic Code that was displayed.Probable cause
Body integrated unitECMTCMVDC/ABSCMCombination meter display (except for meter with MID)
B1100 DTC B1100 INTEG. UNIT SYSTEM ERROR .>B1100Er IUThere could be a problem in the body integrated unit.
U1221 DTC U1221 CAN-HS ECM NO-RECEIVE DATA .>U1221P1718C0057Er HCIt is possible that the ECM is faulty.
U1222 DTC U1222 CAN-HS TCM NO-RECEIVE DATA .>U1222P0600C0057Er HCIt is possible that the TCM is faulty.
U1223 DTC U1223 CAN-HS VDC/ABS NO-RECEIVE DATA .>U1223P0600P1718Er HCIt is possible that the VDC/ABSCM is faulty.
U1321 DTC U1321 CAN-LS METER NO-RECEIVE DATA .>U1321It is possible that the combination meter is faulty.
U1313 DTC U1313 CAN-LS MONITOR DATA ABNORMAL .>U1313It is possible that the navigation monitor is faulty.
B1500 DTC B1500 KEYLESS UART COM. MALFUNCTION .>B1500It is possible that the keyless entry module is faulty.

DIAGNOSTIC TROUBLE CODE CHART

DIAGNOSIS

Subaru Select Monitor communication line is open or shorted.

TROUBLE SYMPTOM

Not communicable with Subaru Select Monitor.

Scheme 9

Scheme 9: WIRING DIAGRAM
Scheme 9: WIRING DIAGRAM
StepCheckYesNo
1 CHECK IGNITION SWITCH.Is the ignition switch ON?Go to step 2.Turn the ignition switch to ON, and select Integ. Unit 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 COMMUNICATION OF SUBARU SELECT MONITOR. Turn the ignition switch to ON. Using the Subaru Select Monitor, check whether communication to other systems can be executed normally.Are system and model year displayed?Go to step 7.Go to step 5 .
5 CHECK COMMUNICATION OF SUBARU SELECT MONITOR. Turn the ignition switch to OFF. Disconnect the body integrated unit connector. Turn the ignition switch to ON. Check whether communication to other systems can be executed normally.Are system and model year displayed?Go to step 7.Go to step 6 .
6 CHECK HARNESS CONNECTOR BETWEEN EACH CONTROL UNIT AND SUBARU SELECT MONITOR. Turn the ignition switch to ON. Disconnect the body integrated unit connector. Measure the resistance between data link connector and chassis ground. Connector & terminal (B40) No. 7 - Chassis groundIs the resistance 1 Mohms or more?Go to step 7.Repair the harness and connector between each control unit and Subaru Select Monitor.
7 CHECK OUTPUT SIGNAL TO BODY INTEGRATED UNIT. Turn the ignition switch to ON. Measure the voltage between body integrated unit 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 unit and Subaru Select Monitor.
8 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND DATA LINK CONNECTOR. Measure the resistance between body integrated unit and data link connector. Connector & terminal (B40) No. 7 - (B280) No. 19Is the resistance less than 1 ohms?Go to step 9.Repair the harness and connector between body integrated unit and Subaru Select Monitor.
9 CHECK INSTALLATION OF BODY INTEGRATED UNIT CONNECTOR. Turn the ignition switch to OFF.Is the body integrated unit connector inserted into body integrated unit until the clamp locks onto it?Go to step 10.Insert the body integrated unit connector into body integrated unit.
10 CHECK POWER SUPPLY CIRCUIT. Turn the ignition switch to ON (engine OFF). Measure the ignition voltage between body integrated unit connector and chassis ground. Connector & terminal (i84) No. 1 (+) - Chassis ground (-)Is the voltage 10 V or more?Go to step 11.Repair the open circuit of harness between body integrated unit and battery.
11 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND CHASSIS GROUND. Turn the ignition switch to OFF. Disconnect the connector from body integrated unit. Measure the resistance of harness between the body integrated unit and chassis ground. Connector & terminal (B280)No. 19 - Chassis groundIs the resistance 1 Mohms or more?Go to step 12.Repair the poor contact of harness between body integrated unit and ground.
12 CHECK POOR CONTACT OF CONNECTORS.Is there poor contact at control unit ground and Subaru Select Monitor?Repair the poor contact of connector.Replace the body integrated unit. BODY INTEGRATED UNIT .>

DIAGNOSTIC PROCEDURE CHART

CAUTIONWhen replacing body integrated unit on the model with immobilizer system, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER".

Defective combination meter

  1. Communication error display in odo/trip meter is not cleared. (Except for meter with MID)
  2. "No trouble code" is displayed on Subaru Select Monitor.

Note. If DTC is not displayed on Subaru Select Monitor, LAN communication System should be OK.

StepCheckYesNo
1 CHECK COMMUNICATION ERROR DISPLAY WITH COMBINATION METER. Turn the ignition switch to ON.Is communication error displayed? (except for meter with MID)Inspect the DTC.Go to step 2 .
2 CHECK COMBINATION METER. Perform the self-diagnosis of combination meter.Is combination meter OK?Go to step 3.Replace the combination meter. COMBINATION METER . >
3 CHECK BODY INTEGRATED UNIT. Display the current data of ECM using Subaru Select Monitor. Check data of "body integrated unit data received".Is "Yes" displayed?Go to step 4.Replace the body integrated unit. BODY INTEGRATED UNIT .>
4 CHECK BODY INTEGRATED UNIT. Display the current data of ECM using Subaru Select Monitor. Check data of "body Integrated unit counter update".Is "Yes" displayed?Repair the poor contact of connector.Replace the body integrated unit. BODY INTEGRATED UNIT .>

DIAGNOSTIC PROCEDURE CHART

DTC DETECTING CONDITION

System error in body integrated unit

  1. Check light comes on in the combination meter, and displays communication error display "Er IU". (Except for meter with MID)
  2. LAN communication immobilizer function may not be executed normally.
StepCheckYesNo
1 CHECK DTC. Connect the Subaru Select Monitor to read all DTCs.Are there DTCs other than that of body integrated unit?Perform the diagnosis according to DTCs for other control units.Go to step 2 .
2 CHECK DTC. Check DTC indicated by body integrated unit.Does the displayed DTC indicate current malfunction?Check the connection of body integrated unit. Go to step 3.Go to step 3 .
3 CHECK DTC. Turn the ignition switch to OFF and read DTCs again.Does the displayed DTC indicate current malfunction?Go to step 5.Go to step 4 .
4 CHECK CURRENT DATA. Using the Subaru Select Monitor, display engine speed and vehicle speed signal from EGM, TCM, VDC/ABS and body integrated unit under the same conditions and compare data.Does each data match each other?Temporary poor contact occurs. Perform the clear memory operation.Go to step 5 .
5 CHECK ALL DTCS.Is DTC concerning ECM displayed?Go to step 6.Replace the body integrated unit. BODY INTEGRATED UNIT .>
6 CHECK DTC CONCERNING ECM.Is output DTC on ECM concerning CAN communication failure?Replace the body integrated unit. BODY INTEGRATED UNIT .>Perform the diagnosis according to DTC concerning ECM.

DIAGNOSTIC PROCEDURE CHART

Battery power supply control circuit is open or shorted.

No malfunction occurs because the back-up power supply is activated.

Note. When B1102 BATT p/supply (backup) malfunction is output at the same time, all the function of body integrated unit may not operate.

Scheme 10

Scheme 10: WIRING DIAGRAM
Scheme 10: WIRING DIAGRAM
StepCheckYesNo
1 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse (No. 7).Is the fuse blown out?Replace the fuse (No. 7). If the replaced fuse has blown out easily, repair the short circuit of harness between fuse (No. 7) and body integrated unit.Go to step 2 .
2 CONTINUITY CHECK OF WIRING HARNESS. Disconnect the connector (B281) from body integrated unit. Measure the voltage between body integrated unit connector and chassis ground. Connector & terminal (B281) No. 2 (+) - Chassis ground (-)Is the voltage 10 V or more?Go to step 3.Repair the harness for open or shorted circuit between body integrated unit and fuse.
3 CHECK POOR CONTACT OF CONNECTORS.Is there poor contact in body integrated unit connector?Repair the poor contact of connector.Go to step 4 .
4 CHECK BODY INTEGRATED UNIT HARNESS. Connect all connectors. Perform the Clear Memory Mode. Read DTC.Is the same DTC displayed?Replace the body integrated unit. BODY INTEGRATED UNIT .>Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE CHART

Battery power supply backup circuit is open or shorted.

  1. Engine malfunction indicator light may illuminates.
  2. Keyless entry, room light and key illumination do not operate.
  3. "En IU" may display in combination meter. (Except for meter with MID)

Note. When some B1101 BATT p/supply (control) malfunction cont. are output at the same time, all function of body integrated unit may not function.

IGN power supply circuit is open or shorted.

Symptoms such as illuminating the malfunction indicator light or high speed CAN error display "Er HC" may occur. (Except for meter with MID)

Scheme 11

Scheme 11: WIRING DIAGRAM
Scheme 11: WIRING DIAGRAM
StepCheckYesNo
1 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse (No. 12).Is the fuse blown out?Replace the fuse (No. 12). If the replaced fuse has blown out easily, repair the short circuit of harness between fuse (No. 12) and body integrated unit.Go to step 2 .
2 CONTINUITY CHECK OF WIRING HARNESS. Disconnect the connector (i84) from body integrated unit. Turn the ignition switch to ON. Measure the voltage between body integrated unit connector and chassis ground. Connector & terminal (i84) No. 1 (+) - Chassis ground (-)Is the voltage 10 V or more?Go to step 3.Repair the harness for open or shorted circuit between body integrated unit and fuse.
3 CHECK POOR CONTACT OF CONNECTOR.Is there poor contact in body integrated unit connector?Repair the poor contact of connector.Go to step 4 .
4 CHECK BODY INTEGRATED UNIT HARNESS. Connect all connectors. Perform the Clear Memory Mode. Read DTC.Is the same DTC displayed?Replace the body integrated unit. BODY INTEGRATED UNIT .>Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE CHART

ACC power supply circuit is open or shorted.

Rear wiper may not operate at ACC position.

Shift lock circuit is shorted to ground.

Shift lock does not be released or remain locked.

Scheme 12

Scheme 12: WIRING DIAGRAM
Scheme 12: WIRING DIAGRAM
StepCheckYesNo
1 CHECK HARNESS. Disconnect the body integrated unit connector (B280). Measure the resistance between body integrated unit connector and chassis ground. Connector & terminal (B280) No. 6 - Chassis groundIs the resistance between 10 - 30 ohms?Go to step 5.Go to step 2 .
2 CHECK HARNESS. Disconnect the body integrated unit connector (B280). Disconnect the shift lock solenoid connector. Measure the resistance between body integrated unit connector and shift lock solenoid connector. Connector & terminal (B280) No. 6 - (B116) No. 3Is the resistance less than 10 ohms?Go to step 3.Repair or replace the open or short circuit of harness.
3 CHECK SHIFT LOCK SOLENOID. Disconnect the shift lock solenoid connector. Measure the internal resistance of shift lock solenoid. Connector & terminal (B116)No.3 - No.4Is the resistance between 10 - 30 ohms?Go to step 4.Replace the shift lock solenoid.
4 CHECK GROUND CIRCUIT. Disconnect the shift lock solenoid connector. Measure the resistance between the shield connector and chassis ground. Connector & terminal (B116) No. 4 - Chassis groundIs the resistance less than 10 ohms?Temporary poor contact occurs. Check the connection of each terminal and repair when necessary.Replace the body integrated unit. BODY INTEGRATED UNIT .>
5 CHECK HARNESS. Disconnect the body integrated unit connector (B280) and shift lock solenoid connector (B116). Measure the resistance between body integrated unit connector (B280) and chassis ground. Connector & terminal (B280) No. 6 - Chassis groundIs the resistance 1 Mohms or more?Replace the body integrated unit. BODY INTEGRATED UNIT .>Repair the short circuit of harness or replace harness.

DIAGNOSTIC PROCEDURE CHART

High speed CAN communication of body integrated unit which monitor the error data and non-received data are faulty.

  1. "Er HC" is displayed in odo/trip meter. (Except for meter with MID)
  2. Malfunction indicator light illuminates.

Scheme 13

Scheme 13: WIRING DIAGRAM
Scheme 13: WIRING DIAGRAM

Scheme 14

Scheme 14
Scheme 14
  1. VDC model
  2. ABS model
StepCheckYesNo
1 CHECK DTC. Connect the Subaru Select Monitor to read all DTCs.Are there DTCs other than that of body integrated unit?Perform the diagnosis according to DTCs for other control units.Go to step 2 .
2 CHECK DTC. Check DTC indicated by body integrated unit.Does the displayed DTC indicate current malfunction?Check the connection of harness connectors. Go to step 3.Go to step 4 .
3 CHECK DTC. Turn the ignition switch to OFF and read DTCs again.Does the displayed DTC indicate current malfunction?Go to step 5.Go to step 4 .
4 CHECK CURRENT DATA. Using the Subaru Select Monitor, display engine speed and vehicle speed signal from EGM, TCM, VDC/ABS and body integrated unit under the same conditions and compare data.Does each data match each other?Temporary poor contact occurs. Perform the clear memory operation.Go to step 5 .
5 CHECK HARNESS. Disconnect the body integrated unit connector (B280). Connect the tester to vehicle side connector, and measure the resistance. Connector & terminal (B280) No. 20 - No. 30Is the resistance between 55 - 65 ohms?Go to step 6.Go to step 9 .
6 CHECK HARNESS. Disconnect the TCM connector (B54). Connect the tester to vehicle side connector, and measure the resistance. Connector & terminal SAT model: (B54)No.3 - No.4: 4AT model: (B54)No. 17 - No. 18Is the resistance between 55 - 65 ohms?Go to step 7.Go to step 9 .
7 CHECK HARNESS. NOTE: For ABS model, Go to step 12 . Disconnect the yaw rate sensor connector (B230). Connect the tester to vehicle side connector, and measure the resistance. Connector & terminal (B230)No.2 - No.3Is the resistance between 55 - 65 ohms?Go to step 8.Go to step 9 .
8 CHECK HARNESS. Disconnect the steering angle sensor connector (B231). Connect the tester to vehicle side connector, and measure the resistance. Connector & terminal (B231)No.1 - No.2Is the resistance between 55 - 65 ohms?Go to step 12.Go to step 9 .
9 CHECK HARNESS.Is the measured resistance 115 - 125 ohms when connecting the tester to vehicle side connector?Go to step 12.Go to step 10 .
10 CHECK HARNESS.Is the measured resistance less than 10 ohms when connecting the tester to vehicle side connector?Repair or replace the short circuit of measured related harness.Go to step 11 .
11 CHECK HARNESS.Is the measured resistance 30 Mohms or more when connecting the tester to vehicle side connector?Repair or replace the open circuit of measured related harness.Go to step 12 .
12 CHECK HARNESS. Disconnect the VDC/ABS CM connector. Connect the tester to vehicle side harness, and measure the resistance. Connector & terminal VDC model: (B310)No.10 - No.35: ABS model: (B301)No.11 - No.26Is the resistance between 115 - 125 ohms?Go to step 13.Go to step 14 .
13 CHECK CONTROL MODULE. Connect the VDC/ABS CM connector. Disconnect the connector from ECM. Connect the tester to vehicle side harness, and measure the resistance between terminals. Connector & terminal (B136) No. 27 - No. 35Is the resistance between 115-125 ohms?Go to step 16.Replace the VDC/ABS CM. VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >
14 CHECK HARNESS. Connect the VDC/ABS CM connector. Disconnect the connector from ECM. Connect the tester to vehicle side harness, and measure the resistance between terminals. Connector & terminal (B136) No. 27 - No. 35Is the resistance between 115 - 125 ohms?Go to step 15.Repair or replace the open circuit of main wiring harness.
15 CHECK CONTROL MODULE. Connect the tester to ECM terminal, and measure the resistance. Connector & terminal (B136) No. 27 - No. 35Is the resistance between 115 - 125 ohms?Go to step 16.Replace the ECM. ENGINE CONTROL MODULE (ECM) . >
16 CHECK CONTROL MODULE. Connect all the control module connectors. Connect the Subaru Select Monitor and perform the clear memory. Disconnect the TCM connector (B54). Turn the ignition switch to ON and read the DTC of body integrated unit. READ DIAGNOSTIC TROUBLE CODE (DTC) .>Is DTC U1201 displayed?Go to step 17.Check the TCM. READ DIAGNOSTIC TROUBLE CODE (DTC) .>
17 CHECK CONTROL MODULE. Connect the TCM control module connector. Using the Subaru Select Monitor, perform the clear memory. Disconnect the steering angle sensor connector (B231). Turn the ignition switch to ON and read the DTC of the body integrated unit. READ DIAGNOSTIC TROUBLE CODE (DTC) .>Is DTC U1201 displayed?Go to step 18.Check the steering angle sensor. READ DIAGNOSTIC TROUBLE CODE (DTC) .>
18 CHECK CONTROL MODULE. Connect the steering angle sensor connector. Using the Subaru Select Monitor, perform the clear memory. Disconnect the yaw rate sensor connector (B230). Turn the ignition switch to ON and read the DTC of the body integrated unit. READ DIAGNOSTIC TROUBLE CODE (DTC) .>Is DTC U1201 displayed?Go to step 19.Check the yaw rate sensor. READ DIAGNOSTIC TROUBLE CODE (DTC) .>
19 CHECK CONTROL MODULE. Connect all the control module connectors. Check the data of "body integrated unit data received" on the current data display of ECM using Subaru Select Monitor.Is the "Yes" displayed?Go to step 20.Replace the body integrated unit. BODY INTEGRATED UNIT .>
20 CHECK CONTROL MODULE. Check the data of "body integrated unit counter update" on the data display of ECM.Is the "Yes" displayed?Inspect the ABS/VDC CM and ECM. READ DIAGNOSTIC TROUBLE CODE (DTC) .> READ DIAGNOSTIC TROUBLE CODE (DTC) .> READ DIAGNOSTIC TROUBLE CODE (DTC) . >Replace the body integrated unit. BODY INTEGRATED UNIT .>
NOTE
For ABS model, Go to step 12 .

DIAGNOSTIC PROCEDURE CHART

  1. Find the unit or CAN line in which trouble occurs, and repair and replace it.
  2. Not received data and error data may be detected at the same time.

"Er HC" is displayed in odo/trip meter. (Except for meter with MID)

Defective data from ECM.

"Er HC" or "Er EG" is displayed in odo/trip meter. (Except for meter with MID)

Scheme 15

Scheme 15: WIRING DIAGRAM
Scheme 15: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Connect the Subaru Select Monitor to read all DTCs.Are there DTCs other than that of body integrated unit?Perform the diagnosis according to DTCs for other control units.Go to step 2 .
2 CHECK DTC. Check DTC indicated by body integrated unit.Does the displayed DTC indicate current malfunction?Check the connection of harness connectors. Go to step 3.Go to step 4 .
3 CHECK DTC. Turn the ignition switch to OFF and read DTCs again.Does the displayed DTC indicate current malfunction?Replace the ECM. REMOVAL .> REMOVAL .> REMOVAL .>Go to step 4 .
4 CHECK CURRENT DATA. Using the Subaru Select Monitor, display engine speed and vehicle speed signal from EGM, TCM, VDC/ABS and body integrated unit under the same conditions and compare data.Does each data match each other?Temporary poor contact occurs. Perform the clear memory operation.Go to step 5 .
5 CHECK ECM. Read the DTC of ECM using the Subaru Select Monitor. OPERATION .>Is DTC other than "CAN communication" displayed?Perform the diagnosis according to DTC.Replace the body integrated unit. BODY INTEGRATED UNIT .>

DIAGNOSTIC PROCEDURE CHART

TCM has error, harness between the main harness splice and TCM is open or shorted, connectors are not connected securely, or the terminal has poor crimping.

  1. SPORT indicator light blinks.
  2. "Er HC" or "Er tC" is displayed in odo/trip meter. (Except for meter with MID)

Scheme 16

Scheme 16: WIRING DIAGRAM
Scheme 16: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Connect the Subaru Select Monitor to read all DTCs.Are there DTCs other than that of body integrated unit?Perform the diagnosis according to DTCs for other control units.Go to step 2 .
2 CHECK DTC. Check DTC indicated by body integrated unit.Does the displayed DTC indicate current malfunction?Check the connection of harness connectors. Go to step 3.Go to step 4 .
3 CHECK DTC. Turn the ignition switch to OFF and read DTCs again.Does the displayed DTC indicate current malfunction?Replace the TCM. TRANSMISSION CONTROL MODULE (TCM) .>Go to step 4 .
4 CHECK CURRENT DATA. Using the Subaru Select Monitor, display engine speed and vehicle speed signal from EGM, TCM, VDC/ABS and body integrated unit under the same conditions and compare data.Does each data match each other?Temporary poor contact occurs. Perform the clear memory operation.Go to step 5 .
5 CHECK TCM. Read the DTC of the TCM using Subaru Select Monitor. OPERATION .>Is DTC other than "CAN communication" displayed?Perform the diagnosis according to DTC.Replace the body integrated unit. BODY INTEGRATED UNIT .>

DIAGNOSTIC PROCEDURE CHART

VDC/ABSCM itself is malfunctioning, the main harness is open or shorted, the connector is not connected properly, or the terminal is crimped poorly.

  1. ABS warning light and VDC warning light illuminates.
  2. "Er HC" or "Er Ab" is displayed in odo/trip meter. (Except for meter with MID)

Scheme 17

Scheme 17: WIRING DIAGRAM
Scheme 17: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Connect the Subaru Select Monitor to read all DTCs.Are there DTCs other than that of body integrated unit?Perform the diagnosis according to DTCs for other control units.Go to step 2 .
2 CHECK DTC. Check DTC indicated by body integrated unit.Does the displayed DTC indicate current malfunction?Check the connection of harness connectors. Go to step 3.Go to step 4 .
3 CHECK DTC. Turn the ignition switch to OFF and read DTCs again.Does the displayed DTC indicate current malfunction?Replace the VDC/ABS CU. VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U) . >Go to step 4 .
4 CHECK CURRENT DATA. Using the Subaru Select Monitor, display engine speed and vehicle speed signal from EGM, TCM, VDC/ABS and body integrated unit under the same conditions and compare data.Does each data match each other?Temporary poor contact occurs. Perform the clear memory operation.Go to step 5 .
5 CHECK VDC/ABS CU. Read the DTC of VDCCM using the Subaru Select Monitor.Is DTC other than "CAN communication" displayed?Perform the diagnosis according to DTC.Replace the body integrated unit. BODY INTEGRATED UNIT .>

DIAGNOSTIC PROCEDURE CHART

Defective ECM. (If error is in the main harness, DTC P0600 CAN communication link is input simultaneously.)

  1. Malfunction indicator light illuminates.
  2. "Er HC" is displayed in odo/trip meter. (Except for meter with MID)

TCM has error, harness between the main harness splice and TCM is open or shorted, connectors are not connected securely, or the terminal has poor crimping.

  1. Malfunction indicator light illuminates.
  2. "Er HC" is displayed in odo/trip meter. (Except for meter with MID)

Defective VDC/ABSCM. (If error is in the main harness, DTC P0600 High-speed CAN circuit is input at the same time.)

  1. ABS warning light and VDC warning light illuminates.
  2. "Er HC" is displayed in odo/trip meter. (Except for meter with MID)

Either end of low-speed CAN communication line is open or shorted, the connector is not connected properly, or the terminal has poor crimping.

"Er LC" is displayed in odo/trip meter (except for meters with MID), but communicating function is normal.

Scheme 18

Scheme 18: WIRING DIAGRAM
Scheme 18: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Connect the Subaru Select Monitor to read DTC of body integrated unit.Are there DTCs other than U1300?Perform the diagnosis according to other DTCs.Go to step 2 .
2 CHECK DTC. Check DTC indicated by body integrated unit.Is U1300 current malfunction?Check the connection of harness connectors. Go to step 3.Go to step 3 .
3 CHECK DTC. Turn the ignition switch to OFF and read DTCs again.Is U1300 current malfunction?Go to step 4.Temporary poor contact occurs.
4 CHECK CURRENT DATA. Display the current data (Auto A/C failure) of body integrated unit using the Subaru Select Monitor.Is OK displayed?Go to step 5.Perform auto A/C self-diagnosis. OPERATION .>
5 CHECK AUTO A/C ECM. Turn the ignition switch to OFF. Disconnect the auto A/C ECM connector (B283). Connect the Subaru Select Monitor and then turn the ignition switch to ON. Perform the clear memory operation for the body integrated unit. Read the DTC of the body integrated unit.Is DTC U1300 detected?Go to step 7.Go to step 6 .
6 CHECK HARNESS. Disconnect the body integrated unit connector (B280) and auto A/C control module connector (B283). Check open or short conditions between body integrated unit connector and auto A/C control module connector. Connector & terminal (B283) No. 1 - (B280) No. 26: (B283) No. 11 - (B280) No. 27Is harness normal?Repalce auto A/C ECM. REMOVAL .>Repair or replace the open or short circuit of harness.
7 CHECK CURRENT DATA. Check current data (center display failure) of the body integrated unit.Is OK displayed?Go to step 8.Repair or replace the center display. REMOVAL .>
8 CHECK CENTER DISPLAY. Turn the ignition switch to OFF. Disconnect the center display connector (i119). Connect the Subaru Select Monitor and then turn the ignition switch to ON. Perform the clear memory operation for the body integrated unit. Read the DTC of the body integrated unit.Is DTC U1300 detected?Go to step 10.Go to step 9 .
9 CHECK HARNESS. Disconnect the body integrated unit connector (i84) and center display connector (i119). Check open or short conditions between body integrated unit connector and center display connector. Connector & terminal (i119) No. 14 - (i84) No. 26: (i119) No. 6 - (i84) No. 27Is harness normal?Replace the center display. REMOVAL .>Repair or replace the open or short circuit of harness.
10 CHECK CURRENT DATA. Check current data (meter failure) of the body integrated unit.Is OK displayed?Go to step 11.Replace the combination meter. REMOVAL .>
11 CHECK COMBINATION METER. Turn the ignition switch to OFF. Disconnect the combination meter connector (i10). Connect the Subaru Select Monitor and then turn the ignition switch to ON. Perform the clear memory operation for the body integrated unit. Read the DTC of the body integrated unit.Is DTC U1300 detected?Go to step 13.Go to step 12 .
12 CHECK HARNESS. Disconnect the combination meter connector (MO). Check open or short conditions between body integrated unit connector and combination meter connector. Connector & terminal (i10) No. 21 - (i84) No. 27: (i10) No. 22 - (i84) No. 26Is harness normal?Replace the combination meter. REMOVAL .>Repair or replace the open or short circuit of harness.
13 CHECK HARNESS. Disconnect connectors of A/C ECM (B283), center monitor (i119), combination meter (i10) and body integrated unit connector (i84). Measure the resistance between connector terminals. Connector & terminal (i84) No. 27 - (i84) No. 26Is the resistance 1 Mohms or more?Go to step 14.Repair the short circuit of harness or replace harness.
14 CHECK HARNESS. Connect the junction connector. Measure the resistance between body integrated unit connector and chassis ground. Connector & terminal (B280) No. 27 - Chassis ground: (B280) No. 26 - Chassis ground: (i84) No. 26 - Chassis ground: (i84) No. 27- Chassis groundIs the resistance less than 10 ohms?Repair the short circuit of harness or replace harness.Go to step 15 .
15 CHECK HARNESS. Turn the ignition switch to ON. Measure the voltage between body integrated unit connector and chassis ground. Connector & terminal (B280) No. 27 (+) - Chassis ground (-): (B280) No. 26 (+) - Chassis ground (-): (i84) No. 26 (+) - Chassis ground (-): (i84) No. 27 (+) - Chassis ground (-)Is the voltage 6 V or more?Repair the short circuit of harness or replace harness.Replace the body integrated unit. BODY INTEGRATED UNIT .>

DIAGNOSTIC PROCEDURE CHART

Find the unit in which trouble occurs and open or short CAN line, and repair and replace them.

(Free running counter error may be detected at the same time from the unit in which the malfunction occurs.)

"Er LC" is displayed in odo/trip meter. (Except for meter with MID)

StepCheckYesNo
1 CHECK DTC. Connect the Subaru Select Monitor to read DTC of body integrated unit.Are there DTCs other than U1301?Perform the diagnosis according to other DTCs.Go to step 2 .
2 CHECK DTC. Check DTC indicated by body integrated unit.Is U1301 current malfunction?Check the connection of harness connectors. Go to step 3.Go to step 3 .
3 CHECK DTC. Turn the ignition switch to OFF and read DTCs again.Is U1301 current malfunction?Go to step 4.Temporary poor contact occurs.
4 CHECK CURRENT DATA. Display the current data (Auto A/C failure) of body integrated unit using the Subaru Select Monitor.Is OK displayed?Go to step 5.Perform auto A/C self-diagnosis. OPERATION .>
5 CHECK AUTO A/C ECM. Turn the ignition switch to OFF. Disconnect the auto A/C ECM connector (B283). Connect the Subaru Select Monitor and then turn the ignition switch to ON. Perform the clear memory operation for the body integrated unit. Read the DTC of the body integrated unit.Is DTC U1301 detected?Go to step 7.Go to step 6 .
6 CHECK HARNESS. Disconnect the body integrated unit connector (B280) and auto A/C control module connector (B283). Check open or short conditions between body integrated unit connector and auto A/C control module connector. Connector & terminal (B283) No. 1 - (B280) No. 26: (B283) No. 11 - (B280) No. 27Is harness normal?Replace auto A/C ECM. REMOVAL .>Repair or replace the open or short circuit of harness.
7 CHECK CURRENT DATA. Check current data (center display failure) of the body integrated unit.Is OK displayed?Go to step 8.Repair or replace the center display. REMOVAL .>
8 CHECK CENTER DISPLAY. Turn the ignition switch to OFF. Disconnect the center display connector (M19). Connect the Subaru Select Monitor and then turn the ignition switch to ON. Perform the clear memory operation for the body integrated unit. Read the DTC of the body integrated unit.Is DTC U1301 detected?Go to step 10.Go to step 9 .
9 CHECK HARNESS. Disconnect the body integrated unit connector (B280) and center display connector (i119). Check open or short conditions between body integrated unit connector and center display connector. Connector & terminal (i119) No. 14 - (i84) No. 26: (i119) No. 6 - (i84) No. 27Is harness normal?Replace the center display. REMOVAL .>Repair or replace the open or short circuit of harness.
10 CHECK CURRENT DATA. Check current data (meter failure) of the body integrated unit.Is OK displayed?Go to step 11.Replace the combination meter. REMOVAL .>
11 CHECK COMBINATION METER. Turn the ignition switch to OFF. Disconnect the combination meter connector (MO). Connect the Subaru Select Monitor and then turn the ignition switch to ON. Perform the clear memory operation for the body integrated unit. Read the DTC of the body integrated unit.Is DTC U1301 detected?Go to step 13.Go to step 12 .
12 CHECK HARNESS. Disconnect the combination meter connector (i10). Check open or short conditions between body integrated unit connector and combination meter connector. Connector & terminal (i10) No. 21 - (i84) No. 27: (i10) No. 22 - (i84) No. 26Is harness normal?Replace the combination meter. REMOVAL .>Repair or replace the open or short circuit of harness.
13 CHECK HARNESS. Disconnect connectors of A/C ECM (B283), center monitor (i119), combination meter (i10) and body integrated unit connector (i84). Measure the resistance between connector terminals. Connector & terminal (i84) No. 27 - (i84) No. 26Is the resistance 1 Mohms or more?Go to step 14.Repair the short circuit of harness or replace harness.
14 CHECK HARNESS. Connect the junction connector. Measure the resistance between body integrated unit connector and chassis ground. Connector & terminal (B280) No. 27 - Chassis ground: (B280) No. 26 - Chassis ground: (i84) No. 26 - Chassis ground: (i84) No. 27 - Chassis groundIs the resistance less than 10 ohms?Repair the short circuit of harness or replace harness.Go to step 15 .
15 CHECK HARNESS. Turn the ignition switch to ON. Measure the voltage between body integrated unit connector and chassis ground. Connector & terminal (B280) No. 27 (+) - Chassis ground (-): (B280) No. 26 (+) - Chassis ground (-): (i84) No. 26 (+) - Chassis ground (-): (i84) No. 27 (+) - Chassis ground (-)Is the voltage 6 V or more?Repair the short circuit of harness or replace harness.Replace the body integrated unit. BODY INTEGRATED UNIT .>

DIAGNOSTIC PROCEDURE CHART

  1. Because of a lot of error data occurred, some units have been disconnected not to affect other units.
  2. Communication failure from the unit in which error is occurred is input at the same time.

"Er LC" is displayed in odo/trip meter. (Except for meter with MID)

Combination meter has error, the harness between main harness splice and combination meter is open or shorted, the connector is not connected properly, or the terminal has poor crimping.

"Er Lc" is displayed in odo/trip meter. (Except for meter with MID)

Scheme 19

Scheme 19: WIRING DIAGRAM
Scheme 19: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Connect the Subaru Select Monitor to read DTC of body integrated unit.Are there DTCs other than U1311?Perform the diagnosis according to other DTCs.Go to step 2 .
2 CHECK DTC. Check DTC indicated by body integrated unit.Does the displayed DTC indicate current malfunction?Check the connection of harness connectors. Go to step 3.Go to step 3 .
3 CHECK DTC. Turn the ignition switch to OFF and read DTCs again.Is U1311 current malfunction?Replace the combination meter. REMOVAL .>Go to step 4 .
4 CHECK COMBINATION METER. Perform self-diagnosis of the combination meter. SELF-DIAGNOSIS .>Is the self-diagnosis OK?Temporary poor contact occurs.Replace the combination meter. REMOVAL .>

DIAGNOSTIC PROCEDURE CHART

Center display unit error, or harness between the main harness splice and center display unit is open or shorted, the connector is not connected securely and the terminal has poor crimping.

"Er LC" is displayed in odo/trip meter. (Except for meter with MID)

Scheme 20

Scheme 20: WIRING DIAGRAM
Scheme 20: WIRING DIAGRAM
StepCheckYesNo
1 CHECK CENTER MONITOR. Display the current data of body integrated unit using Subaru Select Monitor. Display the center display fail display.Is the displayed data OK?Go to step 2.Refer to the navigation display. REMOVAL .>
2 CHECK NAVIGATION. Display the current data of body integrated unit using Subaru Select Monitor. Display NAVI fail.Is the displayed data OK?Refer to the navigation display. REMOVAL .>Refer to the navigation unit. REMOVAL .>

DIAGNOSTIC PROCEDURE CHART

Combination meter unit error, or harness between the main harness splice and combination meter unit is open or shorted, the connector is not connected properly and the terminal has poor crimping.

Fail mode occurs because the data is not received from combination meter unit.

UART between keyless control unit and body integrated unit is open or shorted, the connector is not connected properly, or the terminal is crimped improperly.

Door lock does not operate with keyless.

Scheme 21

Scheme 21: WIRING DIAGRAM
Scheme 21: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Connect the Subaru Select Monitor to read DTC of body integrated unit.Are there DTCs other than B1500?Perform the diagnosis according to other DTCs.Go to step 2 .
2 CHECK DTC. Check DTC indicated by body integrated unit.Does the displayed DTC indicate current malfunction?Check the connection of harness connectors. Go to step 3.Go to step 4 .
3 CHECK DTC. Turn the ignition switch to OFF and read DTCs again.Is B1500 current malfunction?DTC B1500 KEYLESS UART COM. MALFUNCTION .>DTC B1500 KEYLESS UART COM. MALFUNCTION .>
4 CHECK HARNESS. Disconnect the body integrated unit connector (i84) and keyless entry control module connector (i96). Measure the resistance between harnesses. Connector & terminal (i84) No. 9 - (i96) No. 3Is the resistance less than 10 ohms?Go to step 5.Repair the open circuit of harness or replace harness.
5 CHECK HARNESS. Measure the resistance between harness connector and chassis ground. Connector & terminal (i84) No. 9 - Chassis groundIs the resistance less than 1 Mohms?Repair the short circuit of harness or replace harness.Go to step 6 .
6 CHECK HARNESS. Turn the ignition switch to ON. Measure the voltage between harness connector and chassis ground. Connector & terminal (i84) No. 9 (+) - Chassis ground (-)Is the voltage 6 V or more?Repair the short circuit of harness or replace harness.Go to step 7 .
7 CHECK OPERATION. Check the door lock operation when the doors LOCK/UNLOCK using manual LOCK switch.Does it operate on switch operation?Go to step 8.Replace the body integrated unit. BODY INTEGRATED UNIT .>
8 CHECK OPERATION. Remove the ignition key. Close all the doors, and then perform the LOCK/UNLOCK operation on keyless entry operation.Does it operate?Temporary poor contact occurs.Replace the keyless entry control module. REMOVAL , Keyless Entry Control Module .>

DIAGNOSTIC PROCEDURE CHART

Read the DTC or inspect and diagnose the following data in the current data display using Subaru Select Monitor.

ItemOperationSpecificationsNote
YESNO
Diagnostic codeDTC is not displayed when inspecting all DTCs.DTC is not displayed.Perform the diagnosis according to DTC.
Engine coolant temperatureCheck the current data display of ECM, TCM and body integrated unit. Three data value are the same.Same valuesInspect LAN system.If engine coolant temperature sensor is not OK, inspect the sensor circuit.
R defogger SWIt turns to ON when pressing switch. (Low-speed CAN is OK)Turns to ON.Inspect rear defogger switch.Rear defogger switch is connected with Low-speed CAN.
R defogger outputWhen switch input, it is output.OutputCheck the body integrated unit.If not operating with output, check the rear defogger relay.
Door lock SWWhen locked with door lock switch, it turns to ON.Turns to ON.Inspect door lock switch.The door lock switch is connected to the Low-speed CAN.
Door lock actuatorWhen locked with door lock switch, it is output.OutputCheck the body integrated unit.

LAN SYSTEM CHART

More articles — Lan System (Diagnostics)