LIN Communication System (Diagnostics - Introduction): Diagnosis Lexus LX J200

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use these procedures to troubleshoot the LIN communication system.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. INSPECT BATTERY VOLTAGE Standard voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. NEXT: Go to next step
3. INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* Using the Techstream, inspect the CAN communication function to ensure there are no malfunctions in the communication system. Refer to «DTC CHECK / CLEAR»(ref-385260-S12127877222011021400000) . RESULT Result Proceed to No DTCs output A DTCs output B B --> Go to CAN COMMUNICATION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-385222-S04985080032011021400000) A: Go to next step
4. INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* Using the Techstream, inspect the LIN communication function to ensure there are no malfunctions in the communication system. RESULT Result Proceed to No DTCs output A DTCs output B B --> Go to DIAGNOSTIC TROUBLE CODE CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-385260-S41337605402011021400000) A: Go to next step
5. PROBLEM SYMPTOMS TABLE Refer to the Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE»(ref-385260-S08060466812011021400000) . RESULT Result Proceed to Fault is not listed in problem symptoms table A Fault is listed in problem symptoms table B B --> Go to step 7 A: Go to next step
6. OVERALL ANALYSIS AND TROUBLESHOOTING* Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST»(ref-385260-S16884192162011021400000) Terminals of ECU. Refer to «TERMINALS OF ECU»(ref-385260-S33918747792011021400000) NEXT: Go to next step
7. ADJUST, REPAIR OR REPLACE NEXT --> END

PROBLEM SYMPTOMS TABLE

HINT

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

LIN COMMUNICATION SYSTEM

Scheme 70

Scheme 71

Scheme 72

Scheme 73

Scheme 74

Scheme 75

Scheme 76

Scheme 77

Scheme 78

Scheme 79

Scheme 80

Scheme 81

Scheme 82

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

1. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) Disconnect the 2D, E1, E2 and E3 ECU connectors. Measure the resistance and voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition 2D-62 (GND2) - Body ground W-B - Body ground Ground Always Below 1 ohms E3-1 (GND3) - Body ground BR - Body ground Ground Always Below 1 ohms E2-1 (AM2) - 2D-62 (GND2) W - W-B Battery power supply Always 11 to 14 V E1-6 (AM1) - 2D-62 (GND2) W - W-B 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.
2. CHECK MASTER SWITCH Disconnect the I11 switch 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 I11-11 (B) - I11-12 (GND) L - W-B Battery power supply Always 11 to 14 V I11-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
3. CHECK FRONT POWER WINDOW REGULATOR MOTOR LH Disconnect the I12 motor 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 I12-2 (B) - I12-1 (GND) L - W-B Battery power supply Always 11 to 14 V I12-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
4. CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH Disconnect the I4 motor 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 I4-2 (B) - I4-1 (GND) L - W-B Battery power supply Always 11 to 14 V I4-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
5. CHECK REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY LH Disconnect the J11 motor 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 J11-2 (B) - J11-1 (GND) L - W-B Battery power supply Always 11 to 14 V J11-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
6. CHECK REAR POWER WINDOW REGULATOR MOTOR ASSEMBLY RH Disconnect the J4 motor 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 J4-2 (B) - J4-1 (GND) L - W-B Battery power supply Always 11 to 14 V J4-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
7. CHECK SLIDING ROOF ECU Disconnect the R5 ECU 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 R5-1 (B) - R5-2 (E) L - W-B Battery power supply Always 11 to 14 V R5-2 (E) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
8. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Disconnect the E29 ECU 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 E29-1 (+B) - E29-17 (E) B - W-B Battery power supply Always 11 to 14 V E29-17 (E) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
9. CHECK ID CODE BOX (IMMOBILISER CODE ECU) Disconnect the E28 ECU 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 E28-1 (+B) - E28-8 (GND) B - W-B Battery power supply Always 11 to 14 V E28-8 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
10. CHECK STEERING LOCK ECU Disconnect the E26 ECU 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 E26-7 (B) - E26-1 (GND) R - W-B Battery power supply Always 11 to 14 V E26-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
11. CHECK AIR CONDITIONING AMPLIFIER (A/C ECU) Disconnect the E36 amplifier 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 E36-5 (IG+) - E36-1 (GND) G - W-B IG power supply Engine switch off Below 1 V E36-5 (IG+) - E36-1 (GND) G - W-B IG power supply Engine switch on (IG) 11 to 14 V E36-6 (+B1) - E36-1 (GND) R - W-B Battery power supply Always 11 to 14 V E36-7 (+B2) - E36-1 (GND) R - W-B Battery power supply Always 11 to 14 V E36-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
12. CHECK REAR AIR CONDITIONING CONTROL PANEL Disconnect the E55 switch 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 E55-6 (IG) - E55-1 (E) G - W-B IG power supply Engine switch on (IG) 11 to 14 V E55-1 (E) - Body ground W-B - Body ground Ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
13. CHECK RAIN SENSOR Disconnect the R11 rain sensor connector. Measure the voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition R11-4 (SIG) - Body ground G - Body ground IG signal circuit Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V R11-1 (ES) - Body ground W - Body ground Ground circuit Always Below 1 V If the result is not as specified, there may be a malfunction on the wire harness side.
14. CHECK WINDSHIELD WIPER ECU Disconnect the E89 and E90 ECU connectors. Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition E89-5 (IG1I) - E90-10 (E) G - W-B Power source Engine switch off Below 1 V E89-5 (IG1I) - E90-10 (E) G - W-B Power source Engine switch on (IG) 11 to 14 V E90-10 (E) - Body ground W-B - Body ground Power ground Always Below 1 ohms If the result is not as specified, there may be a malfunction on the wire harness side.
15. CHECK OVERHEAD JUNCTION BLOCK Disconnect the R7 junction block connectors. Measure the resistance and voltage according to the value(s) in the table below. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition R7-20 (GND5) - Body ground W-B - Body ground Ground Always Below 1 ohms R7-17 (GND7) - Body ground W-B - Body ground Ground Always Below 1 ohms R7-9 (IG) - Body ground G - 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.
16. CHECK NO. 2 MAIN BODY ECU Disconnect the L33 ECU 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 L33-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 V L33-14 (BECU) - Body ground R - 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.
17. CHECK SEAT CLIMATE CONTROL ECU LH (w/ Climate Control Seat System) Disconnect the c38 ECU 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 c38-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 V c38-2 (B) - Body ground G - Body ground Battery power supply Always 11 to 14 V c38-1 (IG) - Body ground G - Body ground IG power supply Engine switch off Below 1 V c38-1 (IG) - Body ground G - 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.
18. CHECK SEAT CLIMATE CONTROL ECU RH (w/ Climate Control Seat System) Disconnect the c24 ECU 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 c24-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 V c24-2 (B) - Body ground G - Body ground Battery power supply Always 11 to 14 V c24-1 (IG) - Body ground G - Body ground IG power supply Engine switch off Below 1 V c24-1 (IG) - Body ground G - 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.

DTC CHECK / CLEAR

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 / (desired system) / Trouble Codes. Read the DTCs.
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 / (desired system) / Trouble Codes. Clear the DTCs.

DATA LIST / ACTIVE TEST

1. READ DATA LIST HINT: Using the Techstream to read the Data List allows 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. According to the display on the Techstream, read the Data List. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Communication D-Door Motor Connection status between power window regulator motor (for driver side) and main body ECU / OK or STOP OK: Connection STOP: No connection When there is a malfunction, a DTC is stored. Communication P-Door Motor Connection status between power window regulator motor (for front passenger side) and main body ECU / OK or STOP OK: Connection STOP: No connection When there is a malfunction, a DTC is stored. Communication RR-Door Motor Connection status between power window regulator motor (for rear RH) and main body ECU / OK or STOP OK: Connection STOP: No connection When there is a malfunction, a DTC is stored. Communication RL-Door Motor Connection status between power window regulator motor (for rear LH) and main body ECU / OK or STOP OK: Connection STOP: No connection When there is a malfunction, a DTC is stored. Communication Slide Roof Connection status between sliding roof ECU and main body ECU / OK or STOP OK: Connection STOP: No connection When there is a malfunction, a DTC is stored. Communication Master SW Connection status between power window ECU (master switch) and main body ECU / OK or STOP OK: Connection STOP: No connection When there is a malfunction, a DTC is stored. Number of Trouble Codes Number of trouble codes / Min.: 0, Max.: 255 Number of DTCs

DIAGNOSTIC TROUBLE CODE CHART

HINT

If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the table below.