LIN Communication System (Diagnostics - Introduction): Diagnosis Lexus ES XV60

HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]

HINT

1. Use the following procedure to troubleshoot the LIN communication system.

1. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS 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 in 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 NEXT: Go to next step
3. INSPECT BATTERY VOLTAGE 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. NEXT: Go to next step
4. CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* Using the Techstream, inspect the LIN communication function to ensure there are no malfunctions in the communication system. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598669-S03554316722014021400000) . Result Result Proceed to DTC is not output A DTC is output B B --> GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART [06/2012 - ]»(ref-598669-S26290307122014021400000) A: Go to next step
5. OVERALL ANALYSIS AND TROUBLESHOOTING* Terminals of ECU. Refer to «TERMINALS OF ECU [06/2012 - ]»(ref-598669-S35575746842014021400000) Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST [06/2012 - ]»(ref-598669-S37418617042014021400000) NEXT: Go to next step
6. REPAIR OR REPLACE NEXT: Go to next step
7. CONFIRMATION TEST NEXT --> END

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1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Disconnect the 3D and 3B instrument panel junction block assembly 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 connectors disconnected. Tester Connection Wiring Color Terminal Description Condition Specified Condition 3D-31 (BECU) - Body ground V - Body ground Battery power supply Always 11 to 14 V 3B-7 (GND1) - 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 3C and 3B instrument panel junction block assembly connectors. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition 3C-26 (LIN2) - 3B-7 (GND1) P - W-B LIN communication line Engine switch on (IG) Pulse generation 3B-30 (LIN2) - 3B-7 (GND1) P - W-B LIN communication line Engine switch on (IG) Pulse generation If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.
2. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Driver Door) Disconnect the M8 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 M8-2 (B) - M8-1 (GND) GR - W-B Battery power supply Always 11 to 14 V M8-1 (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 M8 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 M8-9 (LIN) - M8-1 (GND) L - W-B LIN communication line Engine switch on (IG) Pulse generation If the result is not as specified, the power window regulator motor assembly (for driver door) may be malfunctioning.
3. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Front Passenger Door) Disconnect the L9 power window regulator motor assembly (for front passenger 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 L9-2 (B) - L9-1 (GND) GR - W-B Battery power supply Always 11 to 14 V L9-1 (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 L9 power window regulator motor assembly (for front passenger door) connector. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition L9-9 (LIN) - L9-1 (GND) P - W-B LIN communication line Engine switch on (IG) Pulse generation If the result is not as specified, the power window regulator motor assembly (for front passenger door) may be malfunctioning.
4. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Rear RH Door) Disconnect the N2 power window regulator motor assembly (for rear RH 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 N2-2 (B) - N2-1 (GND) R - W-B Battery power supply Always 11 to 14 V N2-1 (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 N2 power window regulator motor assembly (for rear RH door) connector. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition N2-9 (LIN) - N2-1 (GND) P - W-B LIN communication line Engine switch on (IG) Pulse generation If the result is not as specified, the power window regulator motor assembly (for rear RH door) may be malfunctioning.
5. CHECK POWER WINDOW REGULATOR MOTOR ASSEMBLY (for Rear LH Door) Disconnect the O2 power window regulator motor assembly (for rear LH 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 O2-2 (B) - O2-1 (GND) G - W-B Battery power supply Always 11 to 14 V O2-1 (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 O2 power window regulator motor assembly (for rear LH door) connector. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition O2-9 (LIN) - O2-1 (GND) P - W-B LIN communication line Engine switch on (IG) Pulse generation If the result is not as specified, the power window regulator motor assembly (for rear LH door) may be malfunctioning.
6. CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY Disconnect the M4 multiplex network master switch 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 M4-11 (B) - M4-12 (GND) W - W-B Battery power supply Always 11 to 14 V M4-12 (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 M4 multiplex network master switch assembly connector. Check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition M4-17 (LIN1) - M4-12 (GND) P - W-B LIN communication line Engine switch on (IG) Pulse generation M4-16 (LIN2) - M4-12 (GND) L - W-B LIN communication line Engine switch on (IG) Pulse generation If the result is not as specified, the multiplex network master switch assembly may be malfunctioning.
7. CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) Disconnect the T4 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 T4-8 (B) - T4-12 (E) B - W-B Battery power supply Always 11 to 14 V T4-12 (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 T4 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 T4-11 (MPX1) - T4-12 (E) P - W-B LIN communication line Engine switch on (IG) Pulse generation If the result is not as specified, the sliding roof ECU (sliding roof drive gear sub-assembly) may be malfunctioning.
8. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Disconnect the A36 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 A36-2 (+B) - A36-11 (E) W - W-B Battery power supply Always 11 to 14 V A36-11 (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 A36 certification ECU (smart key ECU assembly) connector. Measure the voltage and check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition H56-5 (IG) - A36-11 (E) LG - W-B IG power supply Engine switch on (IG) 11 to 14 V H56-5 (IG) - A36-11 (E) LG - W-B IG power supply Engine switch off Below 1 V H56-17 (LIN) - A36-11 (E) B - W-B LIN communication line Engine switch on (IG) Pulse generation If the result is not as specified, the certification ECU (smart key ECU assembly) may be malfunctioning.
9. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) Disconnect the H18 steering lock ECU (steering lock actuator assembly) connector. Measure the resistance and voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition H18-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms H18-7 (B) - Body ground B - Body ground Battery power supply Always 11 to 14 V H18-6 (IG2) - Body ground LG - Body ground IG power supply Engine switch on (IG) 11 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the H18 steering lock ECU (steering lock actuator assembly) connector. Measure the voltage and check for pulses according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition H18-5 (LIN) - H18-1 (GND) B - W-B LIN communication line Engine switch on (IG) Pulse generation If the result is not as specified, the steering lock ECU (steering lock actuator assembly) may be malfunctioning.
10. CHECK ID CODE BOX (IMMOBILIZER CODE ECU) Disconnect the H15 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 H15-1 (+B) - H15-5 (GND) R - W-B Battery power supply Always 11 to 14 V H15-5 (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 H15 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 H15-2 (LIN1) - H15-5 (GND) B - W-B LIN communication line Engine switch on (IG) Pulse generation If the result is not as specified, the ID code box (immobilizer code ECU) may be malfunctioning.

DIAGNOSIS SYSTEM [06/2012 - ]

1. DESCRIPTION The main body ECU (multiplex network body ECU) and certification ECU (smart key ECU assembly) control the LIN communication system. LIN communication system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3). When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.
2. CHECK DLC3 Check the DLC3. Refer to «GENERAL INFORMATION [06/2012 - ]»(ref-598449-S41583545682014021400000) .
3. INSPECT BATTERY VOLTAGE Measure the battery voltage. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery.

DTC CHECK / CLEAR [06/2012 - ]

1. CHECK DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Smart Access or Main Body / Trouble Codes. Check the details of the DTC(s). Refer to «DIAGNOSTIC TROUBLE CODE CHART [06/2012 - ]»(ref-598669-S26290307122014021400000) .
2. CLEAR DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Smart Access or Main Body / Trouble Codes. Clear the DTC(s).

DATA LIST / ACTIVE TEST [06/2012 - ]

1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Main Body / Data List. Read the Data List according to the display on the Techstream. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Communication D-Door Motor Connection status between power window regulator motor assembly (for driver door) and main body ECU (multiplex network body ECU)/OK or STOP OK: Connected STOP: Not Connected DTC is output if an error occurs in LIN communication. Communication P-Door Motor Connection status between power window regulator motor assembly (for front passenger door) and main body ECU (multiplex network body ECU)/OK or STOP OK: Connected STOP: Not Connected DTC is output if an error occurs in LIN communication. Communication RR-Door Motor Connection status between power window regulator motor assembly (for rear RH door) and main body ECU (multiplex network body ECU)/OK or STOP OK: Connected STOP: Not Connected DTC is output if an error occurs in LIN communication. Communication RL-Door Motor Connection status between power window regulator motor assembly (for rear LH door) and main body ECU (multiplex network body ECU)/OK or STOP OK: Connected STOP: Not Connected DTC is output if an error occurs in LIN communication. Communication Slide Roof Connection status between sliding roof ECU (sliding roof drive gear sub-assembly) and main body ECU (multiplex network body ECU)/OK or STOP OK: Connected STOP: Not Connected DTC is output if an error occurs in LIN communication. Communication Master SW Connection status between multiplex network master switch assembly and main body ECU (multiplex network body ECU)/OK or STOP OK: Connected STOP: Not Connected DTC is output if an error occurs in LIN communication.

DIAGNOSTIC TROUBLE CODE CHART [06/2012 - ]

MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)