Smart Access System (Keyless Start) (Diagnostics - Introduction): Diagnosis Lexus HS I

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use the following procedure to troubleshoot the start function.
2. *: Use the Techstream.

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 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 AUXILIARY BATTERY VOLTAGE Measure the auxiliary battery voltage with the power switch off. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step. NEXT: Go to next step
4. CHECK CAN COMMUNICATION SYSTEM* Use the Techstream to check if the CAN communication system is functioning normally. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-398235-S17886579092011051600000) . Result Result Proceed to CAN communication DTC is not output A CAN communication DTC is output B B --> GO TO CAN COMMUNICATION SYSTEM. Refer to «DIAGNOSIS SYSTEM»(ref-398235-S15853483682011051600000) A: Go to next step
5. CHECK LIN COMMUNICATION SYSTEM* Use the Techstream to check if the LIN communication system is functioning normally. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-398321-S20496168032011051600000) . Result Result Proceed to LIN communication DTC is not output A LIN communication DTC is output B B --> GO TO LIN COMMUNICATION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-398321-S18993057102011051600000) A: Go to next step
6. CHECK FOR DTC (for Entry Function)* Check for DTC and note any codes that are output. Refer to «DTC CHECK / CLEAR»(ref-398093-S26317516792011051600000) . Clear the DTC. Recheck for DTCs. 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»(ref-398314-S27645535502011051600000) A: Go to next step
7. CHECK FOR DTC (for Start Function)* Check for DTCs and note any codes that are output. Refer to «DTC CHECK / CLEAR»(ref-398093-S26317516792011051600000) . Clear the DTC. Recheck for DTCs. 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»(ref-398093-S16544608052011051600000) A: Go to next step
8. INSPECT BASIC OPERATION Check that the hybrid control system starts normally when the power switch is pushed with the brake pedal depressed and park (P) selected. Check that the power source mode can be changed by pushing the power switch. HINT: Without depressing the brake pedal, push the power switch repeatedly. The power source mode should change from off to on (ACC), to on (IG) and back to off. With the brake pedal depressed, push the power switch. The hybrid control system should start regardless of the original power source mode. OK Hybrid control system can start normally. NEXT: Go to next step
9. PROBLEM SYMPTOMS TABLE 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 11 . A: Go to next step
10. OVERALL ANALYSIS AND TROUBLESHOOTING* Terminals of ECU. Refer to «TERMINALS OF ECU»(ref-398093-S08983630122011051600000) Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST»(ref-398093-S11395442972011051600000) NEXT: Go to next step
11. REPAIR OR REPLACE NEXT: Go to next step
12. CONFIRMATION TEST 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.

SMART ACCESS SYSTEM WITH PUSH-BUTTON START

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

1. CHECK POWER MANAGEMENT CONTROL ECU Disconnect the F51 and F52 connectors. Measure the voltage and resistance according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition F51-8 (IG2D) - Body ground LG - Body ground IG2 relay operation signal Always 131 to 230 ohms F51-11 (STP1) - Body ground L - Body ground Stop light switch signal Brake pedal depressed 11 to 14 V F51-11 (STP1) - Body ground L - Body ground Stop light switch signal Brake pedal released Below 1 V F52-1 (AM22) - Body ground R - Body ground +B power supply Always 11 to 14 V F52-2 (AM21) - Body ground L - Body ground +B power supply Always 11 to 14 V F52-6 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms F52-5 (GND2) - Body ground W-B - Body ground Ground Always Below 1 ohms F52-13 (CA1L) - Body ground B - Body ground CAN communication line Always 10 kohms or higher F52-14 (CA1H) - Body ground V - Body ground CAN communication line Always 10 kohms or higher F52-17 (SSW2) - Body ground V - Body ground Power switch signal Power switch pushed Below 1 ohms F52-17 (SSW2) - Body ground V - Body ground Power switch signal Power switch not pushed 10 kohms or higher F52-18 (SSW1) - Body ground L - Body ground Power switch signal Power switch pushed Below 1 ohms F52-18 (SSW1) - Body ground L - Body ground Power switch signal Power switch not pushed 10 kohms or higher F52-19 (ACCD) - Body ground GR - Body ground ACC relay operation signal Always 50.625 to 61.875 ohms F52-20 (IG1D) - Body ground P - Body ground IG1 relay operation signal Always 50.625 to 61.875 ohms F52-24 (LIN2) - Body ground GR - Body ground LIN communication line Always 10 kohms or higher If the result is not as specified, there may be a malfunction in the wire harness. Reconnect the F51 and F52 connectors. 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 F51-8 (IG2D) - F52-6 (GND) LG - W-B IG2 signal Power switch on (IG) Output voltage at terminal AM21 or AM22 is -2 V or more F51-8 (IG2D) - F52-6 (GND) LG - W-B IG2 signal Power switch on (ACC) Below 1 V F52-10 (INDW) - F52-6 (GND) BR - W-B Warning signal Brake pedal depressed, park (P) selected, power switch on (ACC, IG) 8 to 14 V F51-12 (RDY) - Body ground Y - Body ground Ready on signal Power switch on (IG) --> on (READY) Pulse generation (See waveform 1 (Scheme 2) ) F52-21 (PPOS) - F52-6 (GND) V - W-B P position signal Park (P) selected Pulse generation (See waveform 2 (Scheme 3) ) F52-17 (SSW2) - F52-6 (GND) V - W-B Power switch signal Power switch not pushed Output voltage at terminal AM21 or AM22 is -2 V or more F52-17 (SSW2) - F52-6 (GND) V - W-B Power switch signal Power switch pushed Below 1 V F52-18 (SSW1) - F52-6 (GND) L - W-B Power switch signal Power switch not pushed Output voltage at terminal AM21 or AM22 is -2 V or more F52-18 (SSW1) - F52-6 (GND) L - W-B Power switch signal Power switch pushed Below 1 V F52-19 (ACCD) - F52-6 (GND) GR - W-B ACC signal Power switch on (ACC) Output voltage at terminal AM21 or AM22 is -2 V or more F52-19 (ACCD) - F52-6 (GND) GR - W-B ACC signal Power switch off Below 1 V F52-20 (IG1D) - F52-6 (GND) P - W-B IG1 signal Power switch on (IG) Output voltage at terminal AM21 or AM22 is -2 V or more F52-20 (IG1D) - F52-6 (GND) P - W-B IG1 signal Power switch on (ACC) Below 1 V F52-22 (INDS) - F52-6 (GND) LG - W-B Vehicle condition signal Brake pedal depressed, park (P) selected 8 to 14 V F52-23 (SPD) - F52-6 (GND) L - W-B Vehicle speed signal Power switch on (IG), wheel rotated slowly Pulse generation (See waveform 3 (Scheme 4) ) 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 Tester Connection F52-12 (RDY) - Body ground Tool Setting 5 V/DIV., 20 ms./DIV. Vehicle Condition Power switch on (IG) --> on (READY) Waveform 2 Tester Connection F52-21 (PPOS) - F52-6 (GND) Tool Setting 5 V/DIV., 20 ms./DIV. Vehicle Condition Power switch on (IG) Waveform 3 Tester Connection F52-23 (SPD) - F52-6 (GND) Tool Setting 5 V/DIV., 10 ms./DIV. Vehicle Condition Driving at approx. 20 km/h (12 mph) HINT: The wavelength becomes shorter as the vehicle speed increases.
2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Disconnect the F50 connector. Measure the voltage and resistance according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition F50-1 (+B) - Body ground R - Body ground +B power supply Always 11 to 14 V F50-9 (CANH) - Body ground V - Body ground CAN communication line Always 10 kohms or higher F50-10 (CANL) - Body ground B - Body ground CAN communication line Always 10 kohms or higher F50-15 (E) - Body ground W-B - Body ground Ground Always Below 1 ohms F50-16 (IG) - Body ground W - Body ground IG power supply Power switch on (IG) 11 to 14 V F50-29 (LIN) - Body ground V - Body ground LIN communication line Always 10 kohms or higher If the result is not as specified, there may be a malfunction in the wire harness.
3. CHECK TRANSMISSION CONTROL ECU ASSEMBLY Disconnect the A35 and A36 connectors. Measure the voltage and resistance according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition A36-1 (E1) - Body ground W-B - Body ground Ground Always Below 1 ohms A36-5 (E02) - Body ground W-B - Body ground Ground Always Below 1 ohms A36-6 (E01) - Body ground W-B - Body ground Ground Always Below 1 ohms A35-16 (+B) - Body ground G - Body ground Ignition power supply Power switch on (IG) 11 to 14 V A35-16 (+B) - Body ground G - Body ground Ignition power supply Power switch off Below 1 V A35-15 (BATT) - Body ground P - Body ground +B power supply Except power switch on (READY) 11 to 14 V A36-15 (CA1L) - Body ground W - Body ground CAN communication line Always 10 kohms or higher A36-16 (CA1H) - Body ground GR - Body ground CAN communication line Always 10 kohms or higher A36-24 (LIN) - Body ground O - Body ground LIN communication line Always 10 kohms or higher If the result is not as specified, there may be a malfunction in the wire harness.
4. CHECK ID CODE BOX (IMMOBILISER CODE ECU) Disconnect the F16 connector. Measure the resistance and voltage according to the value(s) in the table below. Tester Connection Wiring Color Terminal Description Condition Specified Condition F16-1 (+B) - F16-8 (GND) R - W-B +B power supply Always 11 to 14 V F16-8 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms F16-3 (LIN1) - Body ground V - Body ground LIN communication line Always 10 kohms or higher If the result is not as specified, there may be a malfunction in the wire harness.

DIAGNOSIS SYSTEM

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 the Techstream to check for malfunctions and perform repairs.
2. CHECK DLC3 Check the DLC3. Refer to «GENERAL INFORMATION»(ref-398089-S21707799022011051600000) .
3. INSPECT AUXILIARY BATTERY VOLTAGE Measure the auxiliary battery voltage with the power switch off. Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the auxiliary battery.

DTC CHECK / CLEAR

1. CHECK DTC Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Power Source Control / Trouble Codes. Read the DTC by following the prompts on the Techstream screen. HINT: Refer to the Techstream operator's manual for further details.
2. CLEAR DTC Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Power Source Control / Trouble Codes. Clear the DTC by following the directions on the Techstream screen. HINT: Refer to the Techstream operator's manual for further details.

DATA LIST / ACTIVE TEST

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 power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Power Source Control / Data List. Read the Data List according to the display on the Techstream. POWER SOURCE CONTROL Tester Display Measurement Item/Range Normal Condition Stop Light Switch1 Stop light switch 1/ON or OFF ON: Brake pedal depressed OFF: Brake pedal released Start Switch1 Start switch 1/ON or OFF ON: Power switch pushed OFF: Power switch not pushed Start Switch2 Start switch 2/ON or OFF ON: Power switch pushed OFF: Power switch not pushed Latch Circuit Latch circuit/ON or OFF ON: Power switch on (IG) or on (READY) OFF: Power switch off or on (ACC) IG1 Relay Monitor (Outside) IG1 outer relay monitor/ON or OFF ON: Power switch on (IG) OFF: Power switch off IG1 Relay Monitor (Inside) IG1 inner relay monitor/ON or OFF ON: Power switch on (IG) OFF: Power switch off IG2 Relay Monitor (Outside) IG2 outer relay monitor/ON or OFF ON: Power switch on (IG) OFF: Power switch off IG2 Relay Monitor (Inside) IG2 inner relay monitor/ON or OFF ON: Power switch on (IG) OFF: Power switch off Starter Request Signal Starter request signal monitor/ON or OFF ON: ST relay on OFF: ST relay off ACC Relay Monitor ACC relay monitor/ON or OFF ON: Power switch on (ACC) OFF: Power switch off Ready Signal Status of the ready signal/ON or OFF ON: Hybrid control system on (on (READY)) OFF: Hybrid control system off Vehicle Speed Signal Vehicle speed signal/Stop or Run Stop: Vehicle stopped Run: Vehicle running Shift P Signal Pulse Status of the shift P signal pulse/Unknown, Error2, Normal2, Error1, Normal3, Error3 or Normal1 Unknown: Other Error2: Signal abnormal and park (P) selected Normal2: Signal normal and park (P) selected Error1: Signal abnormal and park (P) state cannot be determined Normal3: Signal normal and reverse (R), neutral (N), drive (D) or brake (B) selected Error3: Signal abnormal and reverse (R), neutral (N), drive (D) or brake (B) selected Normal1: Signal normal and park (P) state cannot be determined Power Supply Condition Power supply condition/All OFF, ACC ON, IG1 ON, IG2 ON, ST ON All OFF: All relays off ACC ON: ACC relay on IG1 ON: IG1 relay on IG2 ON: IG2 relay on ST ON: ST request signal on Powertrain Type Status of the powertrain type/HV-AT, Conventional-AT, Conventional-MT, Conventional-MMT HV-AT IG1 Circuit Status of the IG1 relay activation circuit/OK or NG OK: IG1 relay activation circuit normal NG: IG1 relay activation circuit abnormal IG2 Circuit Status of the IG2 relay activation circuit/OK or NG OK: IG2 relay activation circuit normal NG: IG2 relay activation circuit abnormal Starter Switch Signal Mismatch Power switch error detection/No or Yes No: Power switch error not detected Yes: Power switch error detected Park Signal Mismatch Status of the park signal mismatch/No or Yes No: Park signal mismatch not detected Yes: Park signal mismatch detected Key Certification Waiting Timed Out Key certification error detection/No or Yes No: Key certification error not detected Yes: Key certification error detected Number of Diagnosis Code Number of diagnosis code/Min.: 0, MAX.: 255 Number of DTCs will be displayed Enter the following menus: Body Electrical / Smart Access / Data List. Read the Data List according to the display on the Techstream. SMART ACCESS Tester Display Measurement Item/Range Normal Condition Ignition Switch Power switch/ON or OFF ON: Power switch on (IG) OFF: Power switch off Key Low Battery Low key battery/Yes or No Yes: Key battery voltage low No: Key battery voltage normal # Code Number of DTC recorded/Min.: 0, Max.: 225 Number of DTCs displayed Steering Lock Sleep Cond Transmission control ECU assembly sleep condition/Yes or No Yes: Transmission control ECU assembly sleep mode can be entered No: Transmission control ECU assembly sleep mode cannot be entered Steering Lock Start Cond Transmission control ECU assembly start signal/Yes or No Yes: Transmission control ECU assembly sent a start signal No: Transmission control ECU assembly did not send a start signal Engine Start Condition Hybrid control system start condition/OK or NG OK: Hybrid control system allowed to start NG: Hybrid control system not allowed to start Engine Start Request Start request condition signal/OK or NG OK: Start request condition signal received NG: Start request condition signal not received 3bit Code Request Status of the 3-bit code request/OK or NG OK: 3-bit code request signal received NG: 3-bit code request signal not received S Code Check S code certification result/OK or NG OK: Certification confirmed NG: Certification not confirmed L Code Check L code certification result/OK or NG OK: Certification confirmed NG: Certification not confirmed Unlock Request Receive Status of the gearshift control unlock request receive/OK or NG OK: Gearshift control unlock request signal received NG: Gearshift control unlock request signal not received Lock Request Receive Status of the gearshift control lock request receive/OK or NG OK: Gearshift control lock request signal received NG: Gearshift control lock request signal not received S Code Check (Past) S code certification result (Past)/OK or NG OK: Certification confirmed (past) NG: Certification not confirmed (past) L Code Check (Past) L code verification result (Past)/OK or NG OK: Certification confirmed (past) NG: Certification not confirmed (past) EFI Code Receive SFI communication (when DTC stored)/OK or NG OK: SFI code received NG: SFI code not received EFI Communication SFI communication /OK or NG OK: SFI communication normal NG: SFI communication abnormal Ignition Available Area Ignition available area/Front or All Customization status displayed
2. ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relay, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Power Source Control / Active Test. Perform the Active Test according to the display on the Techstream. POWER SOURCE CONTROL Tester Display Test Part Control Range Diagnostic Note Indicator Condition Power switch indicator Green/Red/No Sig Operate with power switch on (IG) and the vehicle stopped. Enter the following menus: Body Electrical / Smart Access / Active Test. Perform the Active Test according to the display on the Techstream. SMART ACCESS Tester Display Test Part Control Range Power / Engine SW Light Power switch illumination ON/OFF

DIAGNOSTIC TROUBLE CODE CHART

HINT

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

POWER MANAGEMENT CONTROL ECU