LIN Communication System (Diagnostics - Introduction): Other Toyota Corolla XI

PRECAUTION [08/2013 - ]

1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following system after the cable is reconnected. System Name See Procedure Air Conditioning System (for Automatic Air Conditioning System) Refer to «INITIALIZATION [08/2013 - ]»(ref-635429-S20696467122014070300000)
2. IGNITION SWITCH EXPRESSIONS The type of ignition switch used on this model differs depending to the specifications of the vehicle. The expressions listed in the table below are used in this article. Expression Ignition Switch (Position) Engine Switch (Condition) Ignition Switch off LOCK Off (Lock) Ignition Switch ACC ACC On (ACC) Ignition Switch ON ON On (IG) Engine Start START On (Start)

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1. DOOR BUS LINES
2. CERTIFICATION BUS LINES

CAUTION / NOTICE / HINT

HINT

1. Use the following procedure to troubleshoot the LIN communication system.
2. *: Use the Techstream.

PROCEDURE

1. VEHICLE BROUGHT TO WORKSHOP Result Proceed to NEXT Result: 1 NEXT See step 2
2. CUSTOMER PROBLEM ANALYSIS HINT: In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred. Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases. The following 5 items are important points for problem analysis: What Vehicle model, system name When Date, time, occurrence frequency Where Road conditions Under what conditions? Driving conditions, weather conditions How did it happen? Problem symptoms Result Proceed to NEXT Result: 1 NEXT See step 3
3. PRE-CHECK Measure the battery voltage. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step. Check the fuses and relays. Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc. Result Proceed to NEXT Result: 1 NEXT See step 4
4. INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* Using the Techstream, check for CAN communication system DTCs. Refer to «DIAGNOSIS SYSTEM [08/2013 - 04/2014]»(ref-635647-S40458511452014070300000) Refer to «DIAGNOSIS SYSTEM [04/2014 - ]»(ref-635652-S02842089492014070300000) Result Result Proceed to CAN DTCs are not output A CAN DTCs are output B Result: 2 B GO TO CAN COMMUNICATION SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [08/2013 - ]»(ref-635647-S27781195552014070300000) Result: 1 A See step 5
5. INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* Using the Techstream, check for LIN communication system DTCs. Refer to «DTC CHECK / CLEAR [08/2013 - ]»(ref-635671-S21721299832014070300000) Result Result Proceed to LIN DTCs are not output A LIN DTCs are output B Result: 2 B GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART [08/2013 - ]»(ref-635671-S01491111602014070300000) Result: 1 A See step 6
6. OVERALL ANALYSIS AND TROUBLESHOOTING* Terminals of ECU Refer to «TERMINALS OF ECU [08/2013 - ]»(ref-635671-S40924508662014070300000) Data List / Active Test Refer to «DATA LIST / ACTIVE TEST [08/2013 - ]»(ref-635671-S09868747462014070300000) Result Proceed to NEXT Result: 1 NEXT See step 7
7. REPAIR OR REPLACE Result Proceed to NEXT Result: 1 NEXT See step 8
8. CONFIRMATION TEST Result Proceed to NEXT Result: 1 NEXT END

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1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Disconnect the MB main body ECU (multiplex network body ECU) connector. *A Main Body ECU (Multiplex Network Body ECU) with 1 Connector - - *1 Main Body ECU (Multiplex Network Body ECU) - - *a 1 Connector - - *A Main Body ECU (Multiplex Network Body ECU) with 2 Connectors - - *1 Main Body ECU (Multiplex Network Body ECU) - - *a 2 Connectors - - Measure the voltage and resistance according to the value(s) in the table below. HINT: Measure the values on the wire harness side with the connector disconnected. Tester Connection Wiring Color Terminal Description Condition Specified Condition MB-11 (GND1) - Body ground - Ground Always Below 1 ohms MB-30 (BECU) - Body ground - Battery power supply Always 11 to 14 V MB-29 (ACC) - Body ground - ACC power supply Ignition switch ACC 11 to 14 V MB-29 (ACC) - Body ground - ACC power supply Ignition switch off Below 1 V MB-32 (IG) - Body ground - IG power supply Ignition switch ON 11 to 14 V MB-32 (IG) - Body ground - IG power supply Ignition switch off Below 1 V If the result is not as specified, there may be a malfunction in the wire harness. Reconnect the MB main body ECU (multiplex network body ECU) connector. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition 3C-52 (LIN2) - Body ground V - Body ground LIN communication line Ignition switch ON Pulse generation 3C-53 (LIN2) - Body ground GR - Body ground LIN communication line Ignition switch ON Pulse generation If the result is not as specified, the main body ECU (multiplex network body ECU) or driver side junction block assembly may be malfunctioning.
2. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door) Disconnect the H9 power window regulator motor assembly (for driver door) connector. Measure the voltage and resistance according to the value(s) in the table below. HINT: Measure the values on the wire harness side with the connector disconnected. Tester Connection Wiring Color Terminal Description Condition Specified Condition H9-2 (B) - Body ground GR - Body ground Battery power supply Always 11 to 14 V H9-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction in the wire harness. Reconnect the H9 power window regulator motor assembly (for driver door) connector. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition H9-9 (LIN) - Body ground V - Body ground LIN communication line Ignition switch ON Pulse generation If the result is not as specified, the power window regulator motor assembly (for driver door) may be malfunctioning.
3. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Disconnect the E57 certification ECU (smart key ECU assembly) connector. Measure the voltage and resistance according to the value(s) in the table below. HINT: Measure the values on the wire harness side with the connector disconnected. Tester Connection Wiring Color Terminal Description Condition Specified Condition E57-11 (E) - Body ground W-B - Body ground Ground Always Below 1 ohms E57-2 (+B) - Body ground L - Body ground +B power supply Always 11 to 14 V If the result is not as specified, there may be a malfunction in the wire harness. Reconnect the E57 certification ECU (smart key ECU assembly) connector. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition E59-17 (LIN) - Body ground V - Body ground LIN communication line Ignition switch ON Pulse generation If the result is not as specified, the certification ECU (smart key ECU assembly) may be malfunctioning.
4. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) Disconnect the E61 steering lock ECU (steering lock actuator assembly) connector. Measure the resistance and voltage according to the value(s) in the table below. HINT: Measure the values on the wire harness side with the connector disconnected. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition E61-1 (GND) - Body ground W-B Body ground Ground Always Below 1 ohms E61-7 (B) - Body ground L - Body ground Battery power supply Always 11 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the E61 steering lock ECU (steering lock actuator assembly) connector. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition E61-5 (LIN) - Body ground V - Body ground LIN communication line Ignition switch ON Pulse generation If the result is not as specified, the steering lock ECU (steering lock actuator assembly) may be malfunctioning.
5. CHECK ID CODE BOX (IMMOBILIZER CODE ECU) Disconnect the E56 ID code box (immobilizer code ECU) connector. Measure the voltage and resistance according to the value(s) in the table below. HINT: Measure the values on the wire harness side with the connector disconnected. Tester Connection Wiring Color Terminal Description Condition Specified Condition E56-5 (GND) - Body ground BR - Body ground Ground Always Below 1 ohms E56-1 (+B) - Body ground W - Body ground +B power supply Always 11 to 14 V If the result is not as specified, there may be a malfunction in the wire harness. Reconnect the E56 ID code box (immobilizer code ECU) connector. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition E56-2 (LIN1) - Body ground V - Body ground LIN communication line Ignition switch ON Pulse generation If the result is not as specified, the ID code box (immobilizer code ECU) may be malfunctioning.
6. CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) (w/ Sliding Roof System) Disconnect the O6 sliding roof ECU (sliding roof drive gear sub-assembly) connector. Measure the voltage and resistance according to the value(s) in the table below. HINT: Measure the values on the wire harness side with the connector disconnected. Tester Connection Wiring Color Terminal Description Condition Specified Condition O6-8 (B) - Body ground L - Body ground Battery power supply Always 11 to 14 V O6-12 (E) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction in the wire harness. Reconnect the O6 sliding roof ECU (sliding roof drive gear sub-assembly) connector. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition O6-11 (MPX1) - Body ground GR - Body ground LIN communication line Ignition switch ON Pulse generation If the result is not as specified, the sliding roof ECU (sliding roof drive gear sub-assembly) may be malfunctioning.