Smart Access System (Keyless Start) (Diagnostics - Introduction): Diagnosis Lexus ES XV40 facelift

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use the following procedures to troubleshoot the push-button start function.
2. Techstream should be used in steps 4, 5 and 8.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS CHECK 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 in the problem analysis: What Vehicle model, system name When Date, time, occurrence frequency Where Road conditions Under what conditions? Running conditions, driving conditions, weather conditions How did it happen? Problem symptoms NEXT: Go to next step
3. 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
4. INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM Use Techstream to check if the CAN Communication System is functioning normally. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-396655-S39167772552011050900000) . Result Result Proceed to CAN DTC is not output A CAN DTC is output B B --> GO TO «CAN COMMUNICATION SYSTEM»(ref-396655-S21766391472011050900000) CAN COMMUNICATION SYSTEM A: Go to next step
5. CHECK FOR DTC Check for DTCs and note any codes that are output. Refer to «DTC CHECK / CLEAR»(ref-396671-S26133780132011050900000) . Delete DTCs. Recheck for DTCs. Result Result Proceed to DTC does not reoccur A DTC reoccurs B B --> GO TO DIAGNOSTIC TROUBLE CODE CHART A: Go to next step
6. INSPECT BASIC OPERATION Turn the engine switch on (START) and check that the engine starts normally. Make sure that the brake pedal is depressed and the shift position is P at this time. Check that the engine switch mode can be changed by pushing the engine switch. HINT: Without depressing the brake pedal, push the engine switch repeatedly. Engine switch mode should turn from off to on (ACC) to on (IG) and back to off. With the brake pedal depressed, push the engine switch repeatedly. Engine switch mode should turn to ENGINE START from any status. OK Engine can start normally. NEXT: Go to next step
7. PROBLEM SYMPTOMS TABLE Result Result Proceed to Fault is not listed in the problem symptoms table A Fault is listed in the problem symptoms table B B --> Go to step 9 A: Go to next step
8. OVERALL ANALYSIS AND TROUBLESHOOTING Terminals of ECU. Refer to «TERMINALS OF ECU»(ref-396671-S13315547712011050900000) DATA LIST/ACTIVE TEST. Refer to «DATA LIST / ACTIVE TEST»(ref-396671-S10359095102011050900000) NEXT: Go to next step
9. REPAIR OR REPLACE NEXT: Go to next step
10. CONFIRMATION TEST NEXT --> END

PROBLEM SYMPTOMS TABLE

HINT

1. Use the table below to help determine the cause of the problem symptom. 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.

1. Inspect the fuses and relays related to the system before inspecting the suspected areas below.

PUSH-BUTTON START FUNCTION

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

1. CHECK MAIN BODY ECU (INSTRUMENT PANEL J/B) Disconnect the DR, DA, DD, DF, E60, E61 and E59 ECU connectors. Measure the voltage and resistance of the wire harness side connector. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition AM1 (E61-6) - Body ground L - Body ground +B power supply Always 10 to 14 V AM2 (E60-1) - Body ground L - Body ground +B power supply Always 10 to 14 V SSW1 (E61-17) - Body ground L - Body ground Engine switch signal Engine switch pushed Below 1 ohms SSW1 (E61-17) - Body ground L - Body ground Engine switch signal Engine switch not pushed 10 kohms or higher SSW2 (E61-16) - Body ground V - Body ground Engine switch signal Engine switch pushed Below 1 ohms SSW2 (E61-16) - Body ground V - Body ground Engine switch signal Engine switch not pushed 10 kohms or higher GND3 (E59-1) - Body ground W-B - Body ground Ground Always Below 1 ohms LIN1 (DR-9) - Body ground BE - Body ground LIN line Always 10 kohms or higher BATB (DA-1) - Body ground W - Body ground +B Power supply Always 10 to 14 V GND1 (DF-10) - Body ground W-B - Body ground Ground Always Below 1 ohms CANN (E59-15) - Body ground W - Body ground CAN Line Always 10 kohms or higher CANP (E59-16) - Body ground B - Body ground CAN Line Always 10 kohms or higher CANH (E59-5) - Body ground BR - Body ground CAN Line Always 10 kohms or higher CANL (E59-6) - Body ground GR - Body ground CAN Line Always 10 kohms or higher IG (DF-11) - Body ground B - Body ground IG power supply Always 10 to 14 V ALTB (DD-16) - Body ground W - Body ground +B Power supply Always 10 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side. Reconnect the ECU connectors. Measure the voltage of the connector. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition ACC (DF-2) - Body ground L - Body ground ACC power supply Engine switch on (ACC) 10 to 14 V ACCD (E61-22) - GND3 (E59-1) R - W-B ACC signal Engine switch on (ACC) Output voltage at terminal AM1 or AM2 is -2 V or more. ACCD (E61-22) - GND3 (E59-1) R - W-B ACC signal Engine switch off Below 1 V IG1D (E61-3) - GND3 (E59-1) LG - W-B IG1 signal Engine switch on (IG) Output voltage at terminal AM1 or AM2 is -2 V or more. IG1D (E61-3) - GND3 (E59-1) LG - W-B IG1 signal Engine switch on (ACC) Below 1 V IG2D (E60-11) - GND3 (E59-1) BE - W-B IG2 signal Engine switch on (IG) Output voltage at terminal AM1 or AM2 is -2 V or more. IG2D (E60-11) - GND3 (E59-1) BE - W-B IG2 signal Engine switch on (ACC) Below 1 V STP (DC-13) - GND3 (E59-1) W - W-B Stop light signal Brake pedal depressed Output voltage at terminal AM1 or AM2 is -2 V or more. STP (DC-13) - GND3 (E59-1) W - W-B Stop light signal Brake pedal released Below 1 V SLR+ (E61-19) - GND3 (E59-1) BR - W-B Steering lock motor signal Steering lock motor operating Below 1 V SLR+ (E61-19) - GND3 (E59-1) BR - W-B Steering lock motor signal Steering lock motor does not operate Output voltage at terminal AM1 or AM2 is -2 V or more. SLP (E61-18) - GND3 (E59-1) GR - W-B Steering lock actuator position signal Steering lock is locked Pulse generation ( (Scheme 53)waveform 3) SLP (E61-18) - GND3 (E59-1) GR - W-B Steering lock actuator position signal Steering lock is released Pulse generation ( (Scheme 53)waveform 3) SPD (E59-9) - GND3 (E59-1) SB - W-B Vehicle speed signal Engine switch on (IG), rotate rear wheel slowly Pulse generation ( (Scheme 51)waveform 1) TACH (E59-8) - GND3 (E59-1) B - W-B Tachometer signal Engine running Pulse generation ( (Scheme 52)waveform 2) P (E58-2) - GND3 (E59-1) G - W-B Shift lock signal Shift lever P position Output voltage at terminal AM1 or AM2 is -2 V or more. P (E58-2) - GND3 (E59-1) G - W-B Shift lock signal Shift lever not P position Below 1 V ACCR (E60-3) - GND3 (E59-1) B - W-B Starter assist signal Brake pedal depressed, shift lever P position, engine switch is pushed once --> on (IG) 0.1 to 0.8 V * 1 --> Output voltage at terminal AM1 or AM2 is -2 V or more. STSW (E58-4) - GND3 (E59-1) R - W-B Starter activation request signal Brake pedal depressed, engine switch held on (ST) Output voltage at terminal AM1 or AM2 is -2 V or more. STR (E61-8) - GND3 (E59-1) G - W-B Park/neutral position switch Shift lever P or N position --> except P or N position Below 1 V --> Pulse generation *3 STR2 (E58-6) - GND3 (E59-1) V - W-B Starter signal (Sub) Brake pedal depressed, shift lever P or N position, engine switch on (ST) Output voltage at terminal AM1 or AM2 is -3.5 V or more. * 2 INDS (E61-15) - GND3 (E59-1) Y - W-B Vehicle condition signal Brake pedal depressed, shift lever P position. Output voltage at terminal AM1 or AM2 is -3 V or more. INDW (E61-14) - GND3 (E59-1) GR - W-B Warning signal Brake pedal depressed, shift lever P position, engine switch on (ACC, IG) Output voltage at terminal AM1 or AM2 is -3 V or more. SWIL (E61-25) - GND3 (E59-1) R - W-B Illumination signal Light control switch TAIL or HEAD Output voltage at terminal AM1 or AM2 is -2 V or more. HINT: * 1: Voltage is output only when the engine is cranking. * 2: Voltage is output for 0.3 seconds when the engine is cranking to start. Disconnect the B12 connector from the ECM and ST CUT relay before measuring the voltage. * 3: Remove the ST CUT relay before measuring the voltage. If the result is not as specified, the ECU may have a malfunction. Using an oscilloscope, check the signal waveform of the ECU. Waveform 1 WAVEFORM 1 (REFERENCE): Terminal No. SPD (E59-9) - GND3 (E59-1) Tool Setting 5 V/DIV., 10 ms./DIV. Vehicle Condition Driving at approx. 20 km/h (12 mph) HINT: As the vehicle speed increases, the wavelength shortens. Waveform 2 WAVEFORM 2 (REFERENCE): Terminal No. TACH (E59-8) - GND3 (E59-1) Tool Setting 5 V/DIV., 10 ms./DIV. Vehicle Condition Engine idling HINT: As the engine revolution speed increases, the wavelength shortens. Waveform 3 WAVEFORM 3 (REFERENCE): Terminal No. SLP (E61-18) - GND3 (E59-1) Tool Setting 2 V/DIV., 100 ms./DIV. Vehicle Condition Steering lock/unlock
2. CHECK CERTIFICATION ECU Disconnect the E13 ECU connector. Measure the voltage and resistance of the wire harness side connector. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition +B1 (E13-1) - Body ground W - Body ground +B power supply Always 10 to 14 V LIN (E13-10) - Body ground BE - Body ground LIN line Always 10 kohms or higher E (E13-17) - 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. Reconnect the E13 ECU connector. Measure the voltage of the connector. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition IG (E13-18) - Body ground B - Body ground Ignition power supply Engine switch on (IG) 10 to 14 V IG (E13-18) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V If the result is not as specified, the ECU may have a malfunction.
3. CHECK ECM Disconnect the B12 and A10 ECM connectors. Measure the voltage and resistance of the wire harness side connectors. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition +B (A10-2) - Body ground R - Body ground Power source of ECM Engine switch on (IG) 10 to 14 V +B2 (A10-1) - Body ground R - Body ground Power source of ECM Engine switch on (IG) 10 to 14 V IGSW (A10-28) - Body ground Y - Body ground Ignition switch signal Engine switch on (IG) 10 to 14 V E01 (B12-22) - Body ground W-B - Body ground Ground Always Below 1 ohms E02 (B12-21) - Body ground B-W - Body ground Ground Always Below 1 ohms E03 (B12-104) - Body ground B - Body ground Ground Always Below 1 ohms E04 (B12-23) - Body ground W - Body ground Ground Always Below 1 ohms E05 (B12-46) - Body ground W - Body ground Ground Always Below 1 ohms E1 (B12-81) - Body ground W-B - Body ground Ground Always Below 1 ohms ME01 (B12-20) - Body ground 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. Reconnect the ECM connectors. Measure the voltage of the connectors. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition STA (A10-48) - E1 (B12-81) V - W-B Starter relay operation signal Cranking 10 to 14 V ACCR (A10-13) - E1 (B12-81) B - W-B ACC relay cut signal (output) Brake pedal depressed, shift lever P position, engine switch is pushed once --> on (IG) 0.1 to 0.8 V * 1 --> Output voltage at terminal AM1 or AM2 is -2 V or more. TACH (A10-15) - E1 (B12-81) B - W-B Engine revolution signal (output) Idling Pulse generation ( (Scheme 51)waveform 1) STP (A10-36) - E1 (B12-81) W - W-B Stop light switch signal (input) Brake pedal depressed 7.5 to 14 V STP (A10-36) - E1 (B12-81) W - W-B Stop light switch signal (input) Brake pedal released Below 1.5 V STAR (B12-63) - E1 (B12-81) R - W-B Starter signal (Main) Brake pedal depressed, shift lever P or N position, engine switch on (ST) 10 to 14 V NSW (B12-62) - E1 (B12-81) L-B - W-B Park / neutral position switch Shift lever P or N position --> except P or N position Below 1 V --> Pulse generation STSW (A10-14) - E1 (B12-81) R - W-B Starter activation request signal Brake pedal depressed, engine switch held on (ST) Output voltage at terminal AM1 or AM2 is - 2 V or more. HINT: * 1: Voltage is output only when the engine is cranking. If the result is not as specified, the ECM may have a malfunction. Using an oscilloscope, check the signal waveform of the ECM. WAVEFORM 1 (REFERENCE): Terminal No. TACH (A10-15) - E1 (B12-81) Tool Setting 5 V/DIV., 10 ms./DIV. Vehicle Condition Engine idling HINT: As the vehicle speed increases, the wavelength shortens.
4. CHECK STEERING LOCK ECU Disconnect the E78 ECU connector. Measure the voltage and resistance of the wire harness side connector. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition B (E78-7) - Body ground B - Body ground +B power supply Always 10 to 14 V IG2 (E78-6) - Body ground B - Body ground Ignition power supply Engine switch on (IG) 10 to 14 V IG2 (E78-6) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V GND (E78-1) - Body ground W-B - Body ground Ground Always Below 1 ohms SGND (E78-2) - 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. Reconnect the E78 ECU connector. Measure the voltage of the connector. Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition SLP1 (E78-4) - GND (E78-1) GR - W-B Steering lock actuator position signal Steering is locked 10 to 14 V SLP1 (E78-4) - GND (E78-1) GR - W-B Steering lock actuator position signal Steering is released Below 1 V If the result is not as specified, the ECU may have a malfunction.

Scheme 57

1. DESCRIPTION Push-button start function data and the Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the function seems to be malfunctioning, use Techstream to check for malfunctions and perform repairs.
2. CHECK DLC3 HINT: The ECU uses ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format. Symbols (Terminal No.) Terminal Description Condition Specified Condition CG (4) - Body ground Chassis ground Always Below 1 ohms SG (5) - Body ground Signal ground Always Below 1 ohms SIL (7) - SG (5) Bus "+" line During transmission Pulse generation BAT (16) - Body ground Battery positive Always 10 to 14 V CANH (6) - CANL (14) CAN bus line Engine Switch OFF * 56 to 69 ohms CANH (6) - CG (4) HIGH-level CAN bus line Engine Switch OFF * 200 ohms or more CANL (14) - CG (4) LOW-level CAN bus line Engine Switch OFF * 200 ohms or more CANH (6) - BAT (16) HIGH-level CAN bus line Engine Switch OFF * 6 kohms or more CANL (14) - BAT (16) LOW-level CAN bus line Engine Switch OFF * 6 kohms or more NOTE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches or the doors. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector. HINT: Connect the cable of Techstream to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle. If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
3. INSPECT BATTERY VOLTAGE Standard voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding.

DTC CHECK / CLEAR

1. CHECK DTC Connect Techstream to the DLC3. Turn the engine switch on (IG). Enter the following menu items: DIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODES. Read the DTC by following the prompts on the tester screen. HINT: Refer to Techstream operator's manual for further details.
2. CLEAR DTC Connect Techstream to the DLC3. Turn the engine switch on (IG). Enter the following menu items: DIAGNOSIS / OBD/MOBD / DTC INFO / CLEAR CODES. Erase the DTC by following the directions on the tester screen. HINT: Refer to Techstream operator's manual for further details.

DATA LIST / ACTIVE TEST

1. READ DATA LIST HINT: Using 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 as 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. Connect Techstream to the DLC3. When using Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 or less second intervals until communication between the tester and vehicle starts. Turn the engine switch on (IG). Enter the following menus: DIAGNOSIS / OBD/MOBD / DATA LIST. Read the DATA LIST. MAIN BODY: Tester Display Measurement Item/Range Normal Condition Diagnostic Note ACC SW Engine switch on (ACC) / ON or OFF ON: Engine switch on (ACC) OFF: Engine switch off - IG SW Engine switch on (IG) / ON or OFF ON: Engine switch on (IG) OFF: Engine switch off - Stop Light SW Stop light switch / ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - Start Switch 1 Start switch 1 / ON or OFF ON: Engine switch is pushed OFF: Engine switch is not pushed - Start Switch 2 Start switch 2 / ON or OFF ON: Engine switch is pushed OFF: Engine switch is not pushed - Steering Unlock Switch Steering lock condition / ON or OFF ON: Steering is unlocked (Engine switch on (ACC)) OFF: Steering is locked (Engine switch off) - Neutral SW / Clutch SW Park/Neutral position switch / ON or OFF ON: Shift position is P or N OFF: Shift position is except P and N - Shift P Signal Shift P position signal / ON or OFF ON: Shift position is P OFF: Shift position is not P - Vehicle Speed Signal Vehicle speed signal / STOP or RUN STOP: Vehicle is stopped RUN: Vehicle is running - Engine Condition Engine condition / STOP or RUN STOP: Engine is stopped RUN: Engine is running - IG1 Relay Monitor (Outside) IG1 relay monitor (outer) / ON or OFF ON: Engine switch on (IG) OFF: Engine switch off - IG2 Relay Monitor (Outside) IG2 relay monitor (outer) / ON or OFF ON: Engine switch on (IG) OFF: Engine switch off - IG1 Relay Monitor (Inside) IG1 relay monitor (inner) / ON or OFF ON: Engine switch on (IG) OFF: Engine switch off - IG2 Relay Monitor (Inside) IG2 relay monitor (inner) / ON or OFF ON: Engine switch on (IG) OFF: Engine switch off - ACC Relay Monitor ACC relay monitor / ON or OFF ON: Engine switch on (ACC) OFF: Engine switch off - Latch Circuit Latch circuit / ON or OFF ON: Engine switch on (IG) or engine running OFF: Engine switch off or on (ACC) - Starter Request Signal Starter request signal monitor / ON or OFF ON: Starter relay is ON OFF: Starter relay is OFF Engine switch pressed and held with shift lever in P or N Power Supply Condition Power supply condition / ALL, ACC ON, IG1 IG2, ST ON ALL: All relays are OFF ACC ON: ACC relay is ON IG1: IG1 relay is ON IG2: IG2 relay is ON ST ON: ST request signal is ON - ACC Relay Cut Signal ACC relay cut signal / ON or OFF ON: Engine is cranking OFF: Engine is not cranking - Starter Relay Monitor STARTER relay monitor / ON or OFF OF: Engine is cranking OFF: Engine is not cranking Engine is cranking with engine switch on (IG) and shift lever in P or N Communication Smart/Wireless Communication for certification ECU / OK or STOP OK: Communication STOP: No communication
2. PERFORM ACTIVE TEST HINT: Performing Techstream ACTIVE TEST allows the relay, VSV, actuator and other items to be operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way to save time. The DATA LIST can be displayed during the ACTIVE TEST. Connect Techstream to the DLC3. Turn the engine switch on (IG). Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST. Perform the ACTIVE TEST according to the display on the tester. MAIN BODY: Tester Display Test Part Control Range Diagnostic Note Indicator for Lighting Indicator for lighting ON / OFF - Indicator Condition Engine switch indicator Green / Amber / No Sig - P Supply for Steering Lock Power supply for steering lock ECU ON / OFF

DIAGNOSTIC TROUBLE CODE CHART

PUSH-BUTTON START FUNCTION