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Contents Section: Communication Devices All sections

Lan Communication System - Lan (Diagnostics): Diagnosis Subaru Forester SH рестайлинг

Communication Devices 21 illustrations ~745 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: 1.260 or more
  2. Check the fuse condition. Make sure that ampere of the fuse is setting value, and it is not blown out. (Be sure to check the back-up fuse also.)
  3. Check the connecting condition of harness and harness connector.
  4. Confirm settings of body integrated unit are corresponded to vehicle equipment. < Ref. to «REGISTRATION BODY INTEGRATED UNIT»(ref-465425-S27052786822012042000000) . >
  5. Make sure that a setting that does not match the vehicle equipment, is not set User Customizing of the body integrated unit. < Ref. to «USER CUSTOMIZING»(ref-465425-S04934070932012042000000) . >
  6. Confirm "Factory or Market setting" of body integrated unit registrations is "Market".
  7. Confirm key illumination does not blink with ignition switch turned to ON.

TROUBLE SYMPTOM

Not communicable with Subaru Select Monitor.

Scheme 1

Scheme 1: WIRING DIAGRAM
Scheme 1: 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 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.Is the system name 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.Is the system name displayed?Go to step 7.Go to step 6 .
6 CHECK HARNESS CONNECTOR BETWEEN EACH CONTROL MODULE AND SUBARU SELECT MONITOR. Turn the ignition switch to OFF. 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 module and Subaru Select Monitor.
7 CHECK OUTPUT SIGNAL TO BODY INTEGRATED UNIT. Turn the ignition switch to ON. Measure the voltage between data link connector 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 module and Subaru Select Monitor.
8 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND DATA LINK CONNECTOR. Turn the ignition switch to OFF. Measure the resistance between body integrated unit and data link connector. Connector & terminal (B40) No. 7 - (B280) No. 20Is 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 BACK-UP FUSE. Check that back-up fuse is not blown out, or check that it is inserted.Is back-up fuse OK?Go to step 10.Replace the backup fuse, or insert it into the fuse holder.
10 CHECK POWER SUPPLY CIRCUIT. Connect the body integrated unit. Measure the voltage between body integrated unit connector and chassis ground. Connector & terminal (B280) No. 6 (+) - Chassis ground (-): (B281) No. 2 (+) - 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 (i84) No. 28 - Chassis ground: (B279) No. 27 - Chassis ground: (B280) No. 17 - Chassis ground: (B280) No. 20 - 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 CONNECTOR.Is there poor contact of the control unit ground and the Subaru Select Monitor?Repair the poor contact of connector.Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >

DIAGNOSTIC PROCEDURE CHART

CAUTIONFor model with immobilizer, immobilizer registration work is necessary when the body integrated unit replaced. For details, refer to the PC application help for Subaru Select Monitor.

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/ABS CM
B1100 < Ref. to DTC B1100 INTEG. UNIT SYSTEM ERROR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >B1100There could be a problem body integrated unit.
U1221 < Ref. to DTC U1221 CAN-HS ECM NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >U1221P1718C0047It is possible that the ECM is faulty.
U1222 < Ref. to DTC U1222 CAN-HS TCM NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >U1222U0101C0047It is possible that the TCM is faulty.
U1223 < Ref. to DTC U1223 CAN-HS VDC/ABS NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >U1223U0122P1718It is possible that the VDC/ABS CM is faulty.
U1321 < Ref. to DTC U1321 CAN-LS METER NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >U1321It is possible that the combination meter is faulty.
B1500 < Ref. to DTC B1500 KEYLESS UART COM. MALFUNCTION , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >B1500It's possible that there is an internal problem keyless entry control module, or a problem communication line.

DTC CHART

DTC DETECTING CONDITION

Memory read out error in body integrated unit

LAN communication immobilizer function may not be executed normally.

StepCheckYesNo
1 CHECK DTC. Check DTC indicated by body integrated unit. < Ref. to OPERATION , Subaru Select Monitor. >Is B1100 current malfunction?Go to step 2.Temporary EEPROM access error occurred.
2 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the body integrated unit connector. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.Is B1100 current malfunction?Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >Temporary EEPROM access error occurred.

DIAGNOSTIC PROCEDURE CHART

  1. Open or short in battery power supply control circuit
  2. Voltage malfunction caused by poor contact

Each function stops operation.

Note. When B1102 BATT p/supply (backup) malfunction is output at the same time, all the function of body integrated unit may not operate. B1101 may input when the battery run-out occurs.

Scheme 2

Scheme 2: WIRING DIAGRAM
Scheme 2: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to OPERATION , Subaru Select Monitor. >Is B1101 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 B1101 current malfunction?Go to step 3.Go to step 5 .
3 CHECK FUSE. Turn the ignition switch to OFF. Check the fuse.Is the fuse OK?Go to step 4.Replace the defective fuse.
4 CHECK HARNESS. Disconnect the body integrated unit connector (B280). Measure the voltage between body integrated unit connector and chassis ground using tester. Connector & terminal (B280) No. 6 (+) - 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.

DIAGNOSTIC PROCEDURE CHART

  1. Open or short of battery power supply backup circuit
  2. Voltage malfunction caused by poor contact

No influence.

Note. When B1101 BATT p/supply (cont.) malfunction are output at the same time, all function of body integrated unit may not operate. B1101 may input when the battery run-out occurs.

Scheme 3

Scheme 3: WIRING DIAGRAM
Scheme 3: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to 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. Check 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 (B281).Is there poor contact of connector?Repair or replace the poor contact of connector.A temporary change of voltage occurred.

DIAGNOSTIC PROCEDURE CHART

  1. Open or short in IGN power supply circuit
  2. Voltage malfunction caused by poor contact

Error related to LAN system will not be detected.

Note. B1103 may output when the ignition switch turns to ON with the weak battery condition.

Scheme 4

Scheme 4: WIRING DIAGRAM
Scheme 4: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to OPERATION , Subaru Select Monitor. >Is B1103 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 ON. Wait approx. 2 minutes. Read the DTC of body integrated unit using Subaru Select Monitor.Is B1103 current malfunction?Go to step 3.Go to step 5 .
3 CHECK FUSE. Turn the ignition switch to OFF. Check the fuse.Is the fuse OK?Go to step 4.Replace the defective fuse.
4 CHECK HARNESS. Disconnect the body integrated unit connector (B280). Turn the ignition switch to ON. Measure the voltage between body integrated unit connector and chassis ground using tester. Connector & terminal (B280) No. 1 (+) - 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.

DIAGNOSTIC PROCEDURE CHART

  1. Open or short in ACC power supply circuit
  2. Voltage malfunction caused by poor contact

Does not exist.

Note. B1104 may output when the ignition switch turns to ACC with the weak battery condition.

Scheme 5

Scheme 5: WIRING DIAGRAM
Scheme 5: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to 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 ON. Wait approx. 2 minutes. 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. Check the fuse.Is the fuse OK?Go to step 4.Replace the defective fuse.
4 CHECK HARNESS. Disconnect the body integrated unit connector (B280). Turn the ignition switch to ON. 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.

DIAGNOSTIC PROCEDURE CHART

Ground short of key interlock circuit

Key interlock does not keep lock condition.

Scheme 6

Scheme 6: WIRING DIAGRAM
Scheme 6: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Insert the ignition key. Shift to the Neutral range. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to OPERATION , Subaru Select Monitor. >Is B1105 current malfunction?Go to step 2.Go to step 8 .
2 CHECK DTC. Shift the select lever to P range. Remove the ignition key. Disconnect the key lock solenoid connector (B350) and body integrated unit connector (B279). Connect the disconnected connectors. Insert the ignition key. Turn the ignition switch to ON and shift into Neutral. Read the DTC of body integrated unit using Subaru Select Monitor.Is B1105 current malfunction?Go to step 3.Go to step 8 .
3 CHECK KEY LOCK SOLENOID. Turn the ignition switch to OFF. Disconnect the key lock solenoid connector (B350). Measure the resistance between the key lock solenoid connector. Connector & terminal (B350) No. 1 - No. 2Is the resistance 12 - 14.5 ohms?Go to step 4.Replace the key lock solenoid.
4 CHECK KEY LOCK SOLENOID. Connect the battery terminal to key lock solenoid. Terminals (B350) No. 2 - positive terminal: (B350) No. 1 - ground terminalIs the solenoid activated and then key locked?Go to step 5.Replace the key lock solenoid.
5 CHECK HARNESS. Disconnect the body integrated unit connector (B279). Measure the resistance between body integrated unit and key lock solenoid using tester. Connector & terminal (B350) No. 2 - (B279) No. 11Is the resistance less than 10 ohms?Go to step 6.Repair or replace the open circuit of harness.
6 CHECK HARNESS. Measure the resistance between body integrated unit and chassis ground using tester. Connector & terminal (B279) No. 11 - Chassis groundIs the resistance 1 Mohms or more?Go to step 7.Repair or replace the short circuit of the harness.
7 CHECK HARNESS. Connect the body integrated unit. Turn the ignition switch to ON. Measure the voltage between body integrated unit and chassis ground using tester. Connector & terminal (B279) No. 11 - Chassis groundIs the voltage 6 V or more?Repair or replace the short circuit of the harness.Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >
8 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the body integrated unit connector (B279) and key lock solenoid connector (B350).Is there poor contact at disconnected connector terminal?Repair the terminal where poor contact exists, or replace harness.It is possible that temporary poor contact occurs.

DIAGNOSTIC PROCEDURE CHART

Shift lock circuit is open or shorted.

Shift lock does not be released or remain locked.

Note. P0801 may input simultaneously.

Scheme 7

Scheme 7: WIRING DIAGRAM
Scheme 7: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Turn the ignition switch to ON. Keep the Parking range for approx. 5 seconds. Read the DTC of body integrated unit using Subaru Select Monitor.Is B1106 current malfunction?Go to step 2.Go to step 8 .
2 CHECK DTC. Turn the ignition switch to OFF. Disconnect the body integrated unit connector (B279) and shift lock solenoid connector (B117). Connect the disconnected connectors. Turn the ignition switch to ON, then keep the Parking range for approx. 5 seconds. Read the DTC of body integrated unit using Subaru Select Monitor.Is B1106 current malfunction?Go to step 3.Go to step 8 .
3 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the shift lock solenoid connector (B117). Measure the resistance between shift lock solenoid and chassis ground using tester. Connector & terminal (B117) No. 4 - Chassis groundIs the resistance less than 10 ohms?Go to step 4.Repair the open circuit of harness or replace harness.
4 CHECK SHIFT LOCK SOLENOID. Measure the resistance between the shift lock solenoid connector. Connector & terminal (B117) No. 4 - No. 3Is the resistance 19 - 25 ohms?Go to step 5.Replace the shift lock solenoid.
5 CHECK SHIFT LOCK SOLENOID. Connect the battery terminal to shift lock solenoid. Terminals (B117) No. 3 - positive terminal: (B117) No. 4 - ground terminalIs the solenoid activated, and then the shift lock released?Go to step 6.Replace the shift lock solenoid.
6 CHECK HARNESS. Disconnect the body integrated unit connector (B279). Measure the resistance between body integrated unit connector (B279) and chassis ground. Connector & terminal (B279) No. 12 - Chassis groundIs the resistance 1 Mohms or more?Go to step 7.Repair the short circuit of harness or replace harness.
7 CHECK HARNESS. Measure the resistance between body integrated unit connector (B279) and shift lock solenoid (B117). Connector & terminal (B117) No. 3 - (B279) No. 12Is the resistance less than 10 ohms?Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >Repair the open circuit of harness or replace harness.
8 CHECK DTC. With Parking range, depress the brake pedal and keep it at depressed condition. Read the DTC of body integrated unit using Subaru Select Monitor.Is B1106 current malfunction?Go to step 9.Go to step 10 .
9 CHECK DTC. Turn the ignition switch to OFF. Disconnect the body integrated unit connector (B279) and shift lock solenoid connector (B117). Connect the disconnected connectors. Turn the ignition switch to ON. Shift into Parking range, then depress the brake pedal. Read the DTC of body integrated unit using Subaru Select Monitor.Is B1106 current malfunction?Go to step 4.Go to step 10 .
10 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the body integrated unit connector (B279) and shift lock solenoid connector (B117).Is there poor contact of connector terminal?Repair the poor contact of the terminal or replace the harness.It is possible that temporary poor contact occurs.

DIAGNOSTIC PROCEDURE CHART

Communication is unstable because of high speed CAN communication error.

Malfunction indicator light illuminates.

Scheme 8

Scheme 8: WIRING DIAGRAM
Scheme 8: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. < Ref. 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. Turn the ignition switch to OFF. Disconnect all control module connectors (B280, B310, B55, B136, B230, B231) that are connected to high speed CAN communication line. Connect all the disconnected connectors. Turn the ignition switch to ON. 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. Turn the ignition switch to OFF. Disconnect the TCM connector (B55). Turn the ignition switch to ON. 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. Turn the ignition switch to OFF. Connect the TCM connector. Disconnect the steering angle sensor connector (B231). Turn the ignition switch to ON. 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. Turn the ignition switch to OFF. Connect the steering angle sensor connector. Disconnect the yaw rate sensor connector (B230). Turn the ignition switch to ON. 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. Turn the ignition switch to OFF. Connect the yaw rate sensor connector. Disconnect the VDC/ABS CM connector (B310). Install the 120 ohms resistance to VDC/ABS CM connector terminals. Terminals (B310) No. 10 - No. 35: Using the tester, measure the resistance between terminals of data link connector. Terminals (B40) No. 6 - No. 14Is the resistance 60 ohms?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. < Ref. to REMOVAL , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). >Go to step 10 .
10 CHECK ECM. Turn the ignition switch to OFF. Connect the VDC/ABS CM. Disconnect the ECM connector (B136). Install the 120 ohms resistance to ECM connector. Terminals (B136) No. 17 - No. 28: Using the tester, measure the resistance between terminals of data link connector. Connector & terminal (B40) No. 6 - No. 14Is the resistance 60 ohms?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. < Ref. to REMOVAL , Engine Control Module (ECM). >Go to step 13 .
13 CHECK DTC. Turn the ignition switch to OFF. Reconnect all the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.Is U1201 a current malfunction?Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >Go to step 14 .
14 CHECK HARNESS. Shake the instrument harness and bulkhead harness, rear harness. 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. Disconnect the connector used for CAN circuit. 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) harness between terminals of data link connector and TCM. Connector & terminal (B40) No. 14 - (B55) No. 17: (B40) No. 6 - (B55) No. 18Is harness normal?Replace the TCM. < Ref. 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) harness between terminals of data link connector and steering angle sensor. Connector & terminal (B40) No. 14 - (B231) No. 1: (B40) No. 6 - (B231) No. 2Is harness normal?Replace the steering angle sensor. < Ref. 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) harness between terminals of data link connector and yaw rate sensor. Connector & terminal (B40) No. 14 - (B230) No. 3: (B40) No. 6 - (B230) No. 2Is harness normal?Replace the yaw rate sensor. < Ref. to REMOVAL , Yaw Rate and G Sensor. >Repair or replace the harness.
NOTE
If the vehicle is MT model, go to the next step.

DIAGNOSTIC PROCEDURE CHART

Integrated unit communication is shut down because of high speed CAN error.

Each warning light illuminates because the CAN communication (sending and receiving) is not normal.

Scheme 9

Scheme 9: WIRING DIAGRAM
Scheme 9: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Using the Subaru Select Monitor, confirm all DTCs. < Ref. to 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 control module connectors (B280, B310, B55, B136, B230, B231) 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 control module connectors (B280, B310, B55, B136, B230, B231) that are connected to high speed CAN communication line. Using the tester, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (B40) No. 6 - (B136) No. 17: (B40) No. 6 - (B310) No. 35: (B40) No. 6 - (B230) No. 2: (B40) No. 6 - (B231) No. 2: (B40) No. 6 - (B55) No. 18 (AT model): (B40) No. 6 - (B280) No. 3Is harness normal?Go to step 5.Repair or replace the harness.
5 CHECK HARNESS. Using the tester, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (B40) No. 14 - (B136) No. 28: (B40) No. 14 - (B310) No. 10: (B40) No. 14 - (B230) No. 3: (B40) No. 14 - (B231) No. 1: (B40) No. 14 - (B55) No. 17 (AT model): (B40) No. 14 - (B280) No. 9Is 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. 14Is 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. 14Is the resistance 120±5 ohms?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 groundIs 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 groundIs the voltage less than 6 V?Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >Go to step 13 .
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 communication 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.

DIAGNOSTIC PROCEDURE CHART

Received error data from ECM.

It is possible that engine control error may occur.

Scheme 10

Scheme 10: WIRING DIAGRAM
Scheme 10: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. < Ref. to 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. 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 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 communication occurs.

DIAGNOSTIC PROCEDURE CHART

Received error data from TCM.

It is possible that transmission control error may occur.

Scheme 11

Scheme 11: WIRING DIAGRAM
Scheme 11: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. < Ref. to 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 U1212 a current malfunction?Go to step 3.Go to step 4 .
3 CHECK DTC. Turn the ignition switch to OFF. Disconnect the TCM connector. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.Is U1212 a current malfunction?Replace the TCM. < Ref. to REMOVAL , Transmission Control Module (TCM). >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 U1212 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.

DIAGNOSTIC PROCEDURE CHART

Received error data from VDC/ABS module.

It is possible that brake control error may occur.

Scheme 12

Scheme 12: WIRING DIAGRAM
Scheme 12: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. < Ref. to 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.

DIAGNOSTIC PROCEDURE CHART

Not received data from ECM.

Malfunction indicator light illuminates.

Scheme 13

Scheme 13: WIRING DIAGRAM
Scheme 13: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. < Ref. to 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 control module connectors (B280, B310, B55, B136, B230, B231) 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 CURRENT DATA. Turn the ignition switch to OFF. Disconnect all control module connectors (B280, B310, B55, B136, B230, B231) that are connected to high speed CAN communication line. Using the tester, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (B40) No. 6 - (B136) No. 17: (B40) No. 6 - (B310) No. 35: (B40) No. 6 - (B230) No. 2: (B40) No. 6 - (B231) No. 2: (B40) No. 6 - (B55) No. 18 (AT model): (B40) No. 6 - (B280) No. 3Is harness normal?Go to step 5.Repair or replace the harness.
5 CHECK HARNESS. Using the tester, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (B40) No. 14 - (B136) No. 28: (B40) No. 14 - (B310) No. 10: (B40) No. 14 - (B230) No. 3: (B40) No. 14 - (B231) No. 1: (B40) No. 14 - (B55) No. 17 (AT model): (B40) No. 14 - (B280) No. 9Is 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 and stop. 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 7.Go to step 8 .
7 CHECK DTC. Read all DTCs using the Subaru Select Monitor.Are DTCs P1718 or C0047 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.

DIAGNOSTIC PROCEDURE CHART

Not received data from TCM.

Malfunction indicator light illuminates.

Scheme 14

Scheme 14: WIRING DIAGRAM
Scheme 14: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. < Ref. to 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 U1222 a current malfunction?Go to step 3.Go to step 7 .
3 CHECK DTC. Turn the ignition switch to OFF. Disconnect all control module connectors (B280, B310, B55, B136, B230, B231) 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 U1222 a current malfunction?Go to step 4.Go to step 7 .
4 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect all control module connectors (B280, B310, B55, B136, B230, B231) that are connected to high speed CAN communication line. Using the tester, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (B55) No. 17 - (B40) No. 14: (B55) No. 18 - (B40) No. 6Is 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 U1222 a current malfunction?Go to step 6.Go to step 7 .
6 CHECK DTC. Using the Subaru Select Monitor, read all DTCs.Is U0101 or C0047 displayed?Replace the TCM. < Ref. to REMOVAL , Transmission Control Module (TCM). >Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >
7 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 U1222 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.

DIAGNOSTIC PROCEDURE CHART

Not received data from VDC/ABS CM.

ABS warning light and VDC warning light illuminate.

Scheme 15

Scheme 15: WIRING DIAGRAM
Scheme 15: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read all DTCs using the Subaru Select Monitor. < Ref. to 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 control module connectors (B280, B310, B55, B136, B230, B231) 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 control module connectors (B280, B310, B55, B136, B230, B231) that are connected to high speed CAN communication line. Using the tester, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (B40) No. 6 - (B310) No. 35: (B40) No. 14 - (B310) No. 10Is 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 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 U0122 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. 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 U1223 a current malfunction?Repair or replace the harness.Go to step 8 .
8 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect all control module connectors (B280, B310, B55, B136, B230, B231) 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.

DIAGNOSTIC PROCEDURE CHART

Open or short in low speed CAN circuit

Low speed CAN communication is not normal.

Scheme 16

Scheme 16: WIRING DIAGRAM
Scheme 16: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to OPERATION , Subaru Select Monitor. >Is U1300 a current malfunction?Go to step 2.Go to step 7 .
2 CHECK DTC. 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 U1300 a current malfunction?Go to step 3.Go to step 7 .
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, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (184) No. 1 - (i10) No. 27 (combination meter): (i84) No. 9 - (i10) No. 26 (combination meter): (i84) No. 1 - (i88) No. 20 (A/C): (i84) No. 9 - (i88) No. 19 (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 AUDIO OR NAVIGATION. Connect the disconnected connectors. Disconnect the connector of navigation (i50) or audio (i85). Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.Is U1300 a current malfunction?Go to step 5.Replace the navigation or audio. < Ref. to REMOVAL , Audio. >
5 CHECK AUTO A/C CONTROL MODULE. Turn the ignition switch to OFF. Connect the audio or navigation connectors. 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 U1300 a current malfunction?Go to step 6.Replace the auto A/C control module. < Ref. to REMOVAL , Control Unit (Auto A/C Model). >
6 CHECK BODY INTEGRATED UNIT. Turn the ignition switch to OFF. Connect the auto A/C control module. Replace the body integrated unit of your vehicle with the body integrated unit from other vehicle, which is working normally. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.Is U1300 a current malfunction?Replace the combination meter. < Ref. to REMOVAL , Combination Meter. >Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >
7 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 U1300 a current malfunction?Repair or replace the harness.Go to step 8 .
8 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector that is connected to low speed CAN circuit.Is there poor contact at disconnected connector?Repair the connector terminal, or replace harness.Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE CHART

Communication is unstable because of low speed CAN communication error.

Display error may occur in fuel gauge because the CAN communication is not transmitted (sending/receiving) normally.

Scheme 17

Scheme 17: WIRING DIAGRAM
Scheme 17: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to 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 a 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 a 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, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (i84) No. 1 - (i10) No. 27 (combination meter): (i84) No. 9 - (i10) No. 26 (combination meter): (184) No. 1 - (i88) No. 20 (A/C): (i84) No. 9 - (i88) No. 19 (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 (i50) or audio (i85). Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.Is U1301 a current malfunction?Go to step 6.Replace the audio or navigation. < Ref. to REMOVAL , Audio. >
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 a 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 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 a 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.

DIAGNOSTIC PROCEDURE CHART

Integrated unit communication is shut down because of low speed CAN communication error.

Display error may occur in fuel gauge because the CAN communication is not transmitted (sending/receiving) normally.

Scheme 18

Scheme 18: WIRING DIAGRAM
Scheme 18: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to 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, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (i84) No. 1 - (i10) No. 27(combination meter): (i84) No. 9 - (i10) No. 26 (combination meter): (i84) No. 1 - (i88) No. 20 (A/C): (i84) No. 9 - (i88) No. 19 (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 groundIs 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 whose voltage has changed?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. 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 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.

DIAGNOSTIC PROCEDURE CHART

Received error data from meter.

Defective data from combination meter occurs.

Scheme 19

Scheme 19: WIRING DIAGRAM
Scheme 19: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to 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 U1311 a current malfunction?Go to step 3.Go to step 4 .
3 CHECK DTC. Turn the ignition switch to OFF. Disconnect the combination meter connector (i10). Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.Is U1311 a current malfunction?Replace the combination meter. < Ref. to REMOVAL , Combination Meter. >Go to step 4 .
4 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 U1311 a current malfunction?Repair or replace the harness.Go to step 5 .
5 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.

DIAGNOSTIC PROCEDURE CHART

Not received data from meter.

Engine may not be started.

Scheme 20

Scheme 20: WIRING DIAGRAM
Scheme 20: WIRING DIAGRAM
StepCheckYesNo
1 CHECK ALL DTCS. Read all DTCs using the Subaru Select Monitor. < Ref. to OPERATION , Subaru Select Monitor. >Is 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.Go to step 7 .
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, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (i84) No. 1 - (i10) No. 27 (combination meter): (i84) No. 9 - (i10) No. 26 (combination meter): (i84) No. 1 - (i88) No. 20 (A/C): (i84) No. 9 - (i88) No. 19 (A/C): (i84) No. 1 - (i85) No. 12 (audio): (i84) No. 9 - (i85) No. 11 (audio): (i84) No. 1 - (i50) No. 18 (navigation): (184) 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 normal?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. 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 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.

DIAGNOSTIC PROCEDURE CHART

Open or short circuit in keyless UART circuit

Door lock does not operate with keyless.

Scheme 21

Scheme 21: WIRING DIAGRAM
Scheme 21: WIRING DIAGRAM
StepCheckYesNo
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to OPERATION , Read Diagnostic Trouble Code (DTC). >Is B1500 current malfunction?Go to step 2.Go to step 7 .
2 CHECK DTC. Turn the ignition switch to OFF. Disconnect the connectors from body integrated unit and keyless entry control module. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.Is B1500 current malfunction?Go to step 3.Go to step 7 .
3 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the connectors from body integrated unit and keyless entry control module. Using the tester, inspect the open circuit of harness and short (power supply-output short, GND-output short). Connector & terminal Keyless entry CM (i84) No. 24 - (R80) No. 3: TPMS & keyless entry CM (i84) No. 24 - (R221) No. 11Is harness normal?Go to step 4.Repair or replace the harness.
4 CHECK HARNESS. Using the tester, measure the voltage between keyless entry control module and chassis ground. Connector & terminal Keyless entry CM (R80) No. 4 (+) - Chassis ground (-): TPMS & keyless entry CM (R221) No. 6 (+) - Chassis ground (-)Is the voltage battery voltage?Go to step 5.Check the power supply circuit for keyless entry control module.
5 CHECK HARNESS. Using the tester, measure the resistance between keyless entry control module and chassis ground. Connector & terminal Keyless entry CM (R80) No. 7 - Chassis ground: TPMS & keyless entry CM (R221) No. 5 - Chassis groundIs the resistance less than 10 ohms?Go to step 6.Repair the open circuit of harness or replace harness.
6 CHECK OPERATION. Install the keyless entry control module from other vehicle, which is working normally. Register the keyless key which is working normally. Operate the keyless key.Is the door locking operate?Replace the keyless entry control module. < Ref. to REMOVAL , Keyless Entry Control Module. >Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >
7 CHECK CONNECTOR. Disconnect the connectors from body integrated unit and keyless entry control module.Is there poor contact of connector?Repair the connector, or replace harness.Temporary poor contact occurs.

DIAGNOSTIC PROCEDURE CHART

ItemOperationSpecificationsNote
YESNO
Diagnostic codeDTC is not displayed when inspecting all DTCs.System is normal.Perform the diagnosis according to DTC.
Engine coolant temperatureEngine coolant temperature gauge displays correctly without engine coolant temperature warning light illuminating/blinking.System is normal.Refer to the following to check. ENGINE COOLING SYSTEM - (H4DO) article or ENGINE COOLING SYSTEM - COOLING (H4DOTC) article LAN SYSTEMIf three data values are different when display the current data of ECM, TCM and body integrated unit, it is possible that driving system CAN is malfunction.
Remaining fuel levelFuel gauge displays correctly without low fuel warning light remaining illuminated.System is normal.Refer to the following to check. Refer to COMBINATION METER LAN SYSTEMIf the values of "Fuel level resistance" and "Fuel level resistance 2" are different when display the current data of body integrated unit, it is possible that body integrated unit is malfunction.
ATF temperature warning lightATF temperature warning light is free from illuminating/blinking.System is normal.Refer to the following to check. AUTOMATIC TRANSMISSION - 4AT article. Refer to AT SHIFT LOCK CONTROL SYSTEM LAN SYSTEMWarning light also blinks when DTC: B1106 occurs.
EBD warning light ABS warning light VDC warning light Hill start assist warning lightEBD warning light/ABS warning light A/DC warning light/Hill start assist warning light are free from ON/OFF all the time.System is normal.Refer to the following to check. Refer to AIRBAG SYSTEM (DIAGNOSTICS) article Refer to ANTI-LOCK BRAKE SYSTEM - VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS) article Refer to PARKING BRAKE SYSTEM article Refer to COMBINATION METER LAN SYSTEM
Shift positionMeter display of shift position is correct. Shift position changes when switch the shift (up/down) on manual mode.System is normal.Refer to the following to check. Refer to AUTOMATIC TRANSMISSION - 4AT article Refer to COMBINATION METER LAN SYSTEM
Clearance light Low beam High beamClearance light/low beam/high beam illuminate correctly by switch operation. Indicator meter illuminates when clearance light/high beam are illuminating.System is normal.Refer to the following to check. Refer to LIGHTING SYSTEM article Refer to COMBINATION METER LAN SYSTEM
Fog lightFog light illuminates correctly by switch operation. Indicator meter illuminates when each fog light is illuminating.System is normal.Refer to the following to check. Refer to LIGHTING SYSTEM article Refer to COMBINATION METER article LAN SYSTEM
DRLDRL operates correctly.System is normal.Refer to the following to check. Refer to LIGHTING SYSTEM article LAN SYSTEM
Key interlockKey cannot be removed in other than P range. Key can be removed in P range.System is normal.Refer to the following to check. Refer to AT SHIFT LOCK CONTROL SYSTEM LAN SYSTEM
Shift lockShift operation is normal.System is normal.Refer to the following to check. Refer to AT SHIFT LOCK CONTROL SYSTEM Refer to COMBINATION METER LAN SYSTEM
Key warning switch alarmAlarm sounds when driver's door is open with the key removed.System is normal.Refer to the following to check. Refer to COMBINATION METER LAN SYSTEM
Seat belt warning alarmIndicator meter illuminate and alarm sounds when driver's seat belt is not worn. Indicator clock illuminates. When passenger's seat is occupied without passenger's seat belt worn. Alarm sounds when vehicle speed is approx. 15 km/h without seat belt fastened.System is normal.Refer to the following to check. Refer to SEAT BELT SYSTEM article Refer to COMBINATION METER LAN SYSTEM
Rear window defoggerRear window defogger operates by operating the switch. Indicator switch illuminates when rear window defogger is operating.System is normal.Refer to the following to check. Refer to REAR WINDOW DEFOGGER SYSTEM Refer to AUTO A/C CONTROL MODULE I/O SIGNAL
Wiper deicerWiper deicer operates by operating the switch. (When the outside temperature is 5°C or higher, press the switch for three seconds or more to operate forcibly, otherwise the wiper deicer operation will be cancelled.)System is normal.Refer to the following to check. Refer to WIPER DEICER SYSTEM Refer to AUTO A/C CONTROL MODULE I/O SIGNAL
Rear wiperRear wiper operates by operating the switch.System is normal.Refer to the following to check. Refer to WIPER SYSTEM & WASHER SYSTEM articleVehicle speed response time varies depending on the condition of customization of the body integrated unit "Sedan/Wagon Setting".
Door lockLock/unlock operates by operating the central door lock switch. Rear gate opens by operating the rear gate opener button.System is normal.Refer to the following to check. Refer to ANTI-THEFT SYSTEM - SECURITY AND LOCKS article LAN SYSTEMRear gate cannot open by operating the rear gate opener button when customization of the body integrated unit "Sedan/Wagon Setting" is set to "Sedan".
Keyless entryLock/unlock operates by operating the keyless transmitter. Trunk/rear gate unlocks by operating the trunk opener button and rear gate lock/unlock button.System is normal.Refer to the following to check. Refer to ANTI-THEFT SYSTEM - SECURITY AND LOCKS article LAN SYSTEMRear gate swung to open by operating the trunk/rear gate unlock button when customization of the body integrated unit "Sedan/Wagon Setting" is set to "Sedan".
Hazard lightsAnswer back operates by operating lock/unlock with the keyless entry.System is normal.Refer to the following to check. Refer to ANTI-THEFT SYSTEM - SECURITY AND LOCKS article LAN SYSTEM
Room lightON/OFF according to the door open/close operation, the lock/unlock operation with the keyless entry, and the ignition operation.System is normal.Refer to the following to check. Refer to ROOM LIGHT SYSTEM Refer to ANTI-THEFT SYSTEM - SECURITY AND LOCKS article LAN SYSTEM
Map lightON/OFF according to the door open/close operation except rear gate, the lock/unlock operation with the keyless entry, and the ignition operation.System is normal.Refer to the following to check. Refer to SPOT MAP LIGHT Refer to ANTI-THEFT SYSTEM - SECURITY AND LOCKS article LAN SYSTEM
Key illuminationON/OFF according to the driver's door open/close operation, the lock/unlock operation with the keyless entry, and the ignition operation.System is normal.Refer to the following to check. Refer to ENGINE IGNITION SYSTEM - IGNITION (H4DOTC) article Refer to ANTI-THEFT SYSTEM - SECURITY AND LOCKS article LAN SYSTEMKey illumination blinks when customization of the body integrated unit "Factory initial setting" is set to "Factory" for models with keyless entry.
Illumination controlIllumination volume control is available.System is normal.Refer to the following to check. Refer to COMBINATION METER LAN SYSTEMLighting adjustment is not possible when customization of the body integrated unit "Illumination Control On/Off" is set to "Off".
Engine startEngine starts normally.System is normal.Refer to the following to check. Refer to ENGINE CONTROLS - ENGINE (DIAGNOSTICS) (H4DO) article or ENGINE CONTROLS - ENGINE (DIAGNOSTICS) (H4DOTC) article. Refer to ANTI-THEFT SYSTEM - IMMOBILIZER (DIAGNOSTICS) article LAN SYSTEM
Vehicle securityWhen locked by the keyless entry, security monitor condition starts. When unlocked by the keyless entry, security is released.System is normal.Refer to the following to check. Refer to ANTI-THEFT SYSTEM - SECURITY AND LOCKS article. LAN SYSTEMWhen the "Impact sensor" setup is set to "ON" without connecting the impact sensor (dealer option), the alarm operates as soon as security monitor condition occurs.

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