Pre-Collision Safety: Diagnosis Lexus IS II

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use these procedures to troubleshoot the pre-collision system.
2. The intelligent tester should be used in steps 2 , 3 , 4 and 6 .

1. VEHICLE BROUGHT TO WORKSHOP
2. CHECK MULTIPLEX COMMUNICATION SYSTEM Use the intelligent tester to check if the multiplex communication system is functioning normally. Result: RESULT REFERENCE DTC Condition Proceed to DTC is not output A DTC is output B B: GO TO «MULTIPLEX COMMUNICATION SYSTEM»(ref-235578-S20958542052006062400000) A: Go To Next Step
3. CHECK CAN COMMUNICATION SYSTEM Use the intelligent tester to check for normally functioning of CAN communication system. Perform bus check (Communication malfunctioning DTC). Perform bus check (Communication Bus check). Result: RESULT REFERENCE DTC Condition Proceed to DTC is not output A DTC is output B B: GO TO «CAN COMMUNICATION SYSTEM»(ref-235565-S22980917632006062400000) A: Go To Next Step
4. CHECK FOR DTC Check for DTCs. Record the DTCs. Clear the DTCs. Recheck for DTCs. Attempt to duplicate the malfunction and check if the DTCs are output again (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Result: RESULT REFERENCE DTC Condition Proceed to DTC is not output A DTC is output B No DTC is output, and malfunction cannot be duplicated or checked C B: GO TO «DIAGNOSTIC TROUBLE CODE TABLE»(ref-235580-S21469194052006062400000) C: SYMPTOM SIMULATION A: Go To Next Step
5. PROBLEM SYMPTOMS TABLE If the result is not listed on the problem symptoms table, proceed to A. If the result is listed on the problem symptoms table, proceed to B. B: GO TO STEP 7 A: Go To Next Step
6. OVERALL ANALYSIS AND TROUBLESHOOTING See «DATA LIST / ACTIVE TEST»(ref-235580-S24156070492006062400000) . See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) .
7. ADJUST, REPAIR OR REPLACE
8. CONFIRMATION TEST END

PROBLEM SYMPTOMS TABLE

PRE-COLLISION SYSTEM

PROBLEM SYMPTOMS TABLE

Scheme 30

1. SEAT BELT CONTROL ECU TERMINAL SPECIFICATION TABLE Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Value O38-1 (MOR+) - O38-18 (PGND) SB - W-B Seat belt motor RH power source line Engine switch on (IG) 4.0 to 8.5 V O38-2 (MOL+) - O38-18 (PGND) BR - W-B Seat belt motor LH power source line Engine switch on (IG) 4.0 to 8.5 V O38-3 (IG1) - Body ground B - Body ground Seat belt control ECU power source line Engine switch on (IG) 10 to 14 V O38-9 (+B) - Body ground W - W-B Seat belt control ECU power source line Always 10 to 14 V O38-10 (MOR-) - Body ground B - Body ground Seat belt motor RH ground line Engine switch on (IG) 4.0 to 8.5 V O38-11 (MOL-) - Body ground L - Body ground Seat belt motor LH ground line Engine switch on (IG) 4.0 to 8.5 V O38-18 (PGND) - Body ground W-B - Body ground Seat belt control ECU ground line Always Below 1 ohms

Scheme 31

Scheme 32

Scheme 33

1. CHECK DLC3 The seat belt control ECU uses CAN and ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format. TERMINAL SPECIFICATION TABLE Symbols (Terminals No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus "+ " line During transmission Pulse generation CG (4) - Body ground Chassis ground Always Below 1 ohms SG (5) - Body ground Signal ground Always Below 1 ohms BAT (16) - Body ground Battery positive Always 10 to 14 V CANH (6) - CANL HIGH - level CAN bus line Engine switch off 54 to 67 ohms CANH (6) - Battery positive HIGH - level CAN bus line Engine switch off 1 M ohms or higher CANH (6) - CG (4) HIGH - level CAN bus line Engine switch off 3 M ohms or higher CANL (14) - Battery positive LOW - level CAN bus line Engine switch off 1 M ohms or higher CANL (14) - CG (4) LOW - level CAN bus line Engine switch off 3 M ohms or higher 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 the intelligent tester 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 the tester is able to communicate when it 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 tester's instruction manual for information on service or repair of the tester.
2. FUNCTION OF WARNING INDICATOR AND MESSAGE If the pre-collision system is not functioning properly, the driver is warned by the master warning indicator and multi-information display warning message on the combination meter. MASTER WARNING INDICATOR WARNING MESSAGE DETAIL Master Warning Indicator Warning Message Detail DTC PCS Warning indicator ON CHECK PCS SYSTEM This message appears when the seat belt control ECU detects a system malfunction O ON Illuminate PCS NOT AVAILABLE NOW This message appears when the seat belt control ECU is in the fail-safe mode (See «INITIALIZATION»(ref-235580-S34151469302006062400000) ) - Blinking Initial check. The initial check occurs when the engine switch is off for more than 2 seconds, and then turned on (IG). The initial check consists of a pre-collision system diagnostic check with a duration of approximately 3 seconds. If a malfunction is detected during the initial check, the multi-information display will output "CHECK PCS SYSTEM" or "PCS NOT AVAILABLE NOW". Constant check. The seat belt control ECU and distance control ECU constantly monitor the pre-collision system for malfunctions after the initial check approximately 3 seconds after turning the engine switch on (IG). "CHECK PCS SYSTEM " or "PCS NOT AVAILABLE NOW " is displayed on the multi-information display in the combination meter assembly when the constant check detects malfunctions in the pre-collision system.

Scheme 34

1. CHECK DTC Check the DTCs. Connect the intelligent tester (with CAN VIM) to the DLC3. Turn the engine switch on (IG). Check the DTCs by following the prompts on the tester screen. HINT: Refer to the intelligent tester operator's manual for further details. Clear the DTCs. Connect the intelligent tester (with CAN VIM) to the DLC3. Turn the engine switch on (IG). Clear the DTCs by following the prompts on the tester screen. HINT: Refer to the intelligent tester operator's manual for further details.

DATA LIST / ACTIVE TEST

1. DATA LIST HINT: Using the intelligent tester 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 are disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. Connect the intelligent tester (with CAN VIM) to the DLC3. Turn the engine switch on (IG). By following the display on the tester, select the "Data List ". Seat belt control ECU: DATA LIST REFERENCE TABLE Item Measurement Item/Range (Display) Normal Condition Diagnostic Note D BUCKLE SW Buckle switch status of driver's seat UNSET: Unfasten driver side seat belt SET: Fasten driver side seat belt NG: Indeterminate data UNSET / SET - P BUCKLE SW Buckle switch status of passenger's seat / UNSET: Unfasten passenger side seat belt SET: Fasten passenger side seat belt NG: Indeterminate data UNSET / SET - D BELT CTRL Seat belt control status of driver's seat / STOP: Control stopped ON: Controlled ERROR: Indeterminate data STOP / ON Seat belt (driver side) is fastened P BELT CTRL Seat belt control status of passenger's seat / STOP: Control stopped ON: Controlled ERROR: Indeterminate data STOP / ON Seat belt (passenger side) is fastened #PRESENT CODES Number of present trouble codes / min: 0, max: 255 Number of DTCs will be displayed - #PAST CODES Number of past trouble codes / min: 0, max: 255 Number of DTCs will be displayed
2. ACTIVE TEST HINT: Using the intelligent tester to perform Active Test allows the operation or effects of relays, VSVs, actuators and other items to be tested without removing any parts. This non-intrusive inspection can be very useful as intermittent conditions or operation may be discovered before parts or wiring are disturbed. Using the Active Test early in troubleshooting is one way to save diagnostic time. It is possible to view Data List information on the intelligent tester while performing Active Tests. Connect the intelligent tester (with CAN VIM) to the DLC3. Turn the engine switch on (IG). Following the display on the tester, select the "Active Test ". Seat belt control ECU: ACTIVE TEST REFERENCE TABLE Item Vehicle Condition / Test Details Diagnostic Note D BELT MOTOR Driver's seat belt motor / ON: Seat belt motor operates OFF: Seat belt motor does not operates Seat belt (driver side) is fastened P BELT MOTOR Passenger's seat belt motor / ON: Seat belt motor operates OFF: Seat belt motor does not operates Seat belt (passenger side) is fastened D-P BELT MOTOR Driver's and passenger's seat belt motor / ON: Seat belt motors operate OFF: Seat belt motors do not operate Seat belts (driver and passenger) are fastened NOTE: The belt motor is not equipped with buckle switch is not operated. The protect heating up of belt motor, this test can not be activated continuously. Please operate with 30 seconds interval.

DIAGNOSTIC TROUBLE CODE TABLE

PRE-COLLISION SYSTEM DIAGNOSTIC TROUBLE CODE TABLE

DIAGNOSTIC TROUBLE CODE TABLE

INSPECTION PROCEDURE

1. CHECK DTC OUTPUT Turn the engine switch on (IG). Clear the DTCs stored in memory. (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Turn the engine switch off. Turn the engine switch on (IG). Check for the DTCs. (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). OK: No DTC is output. NG: REPLACE SEAT BELT CONTROL ECU OK: USE SIMULATION METHOD TO CHECK

1. CHECK DTC OUTPUT (DYNAMIC RADAR CRUISE CONTROL SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC P1570 is not output. NG: GO TO «DYNAMIC RADAR CRUISE CONTROL SYSTEM»(ref-235581-S21981294072006062400000) OK: Go to next step
2. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC B2055 is not output. NG: REPLACE SEAT BELT CONTROL ECU OK: USE SIMULATION METHOD TO CHECK

1. CHECK DTC OUTPUT (DYNAMIC RADAR CRUISE CONTROL SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC P1572 is not output. NG: GO TO «DYNAMIC RADAR CRUISE CONTROL SYSTEM»(ref-235581-S21981294072006062400000) OK: Go to next step
2. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC B2056 is not output. NG: REPLACE SEAT BELT CONTROL ECU OK: USE SIMULATION METHOD TO CHECK

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC U0123 is not output. NG: GO TO «CAN COMMUNICATION SYSTEM»(ref-235565-S22980917632006062400000) OK: Go to next step
2. CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC C1234 is not output. NG: GO TO «BRAKE CONTROL»(ref-235572) OK: Go to next step
3. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC B2057 is not output. NG: REPLACE SEAT BELT CONTROL ECU OK: USE SIMULATION METHOD TO CHECK

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC U0126 is not output. NG: GO TO «CAN COMMUNICATION SYSTEM»(ref-235565-S22980917632006062400000) OK: Go to next step
2. CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC C1231 is not output. NG: GO TO «BRAKE CONTROL»(ref-235572) OK: Go to next step
3. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC B2058 is not output. NG: REPLACE SEAT BELT CONTROL ECU OK: USE SIMULATION METHOD TO CHECK

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC U0100, U0122 or U1101 is not output. NG: GO TO «CAN COMMUNICATION SYSTEM»(ref-235565-S22980917632006062400000) OK: Go to next step
2. CHECK DTC OUTPUT (ENGINE CONTROL SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC P0500 is not output. NG: GO TO «ENGINE CONTROL SYSTEM»(ref-235543-S23519523512006062400000) OK: Go to next step
3. CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC C0200, C0205, C0210, C0215, C1235, C1236, C1238 or C1239 is not output. NG: GO TO «BRAKE CONTROL»(ref-235572) OK: Go to next step
4. READ VALUE OF INTELLIGENT TESTER Operate the intelligent tester according to the steps on the display and select the "DATA LIST ". COMBINATION METER DATA LIST REFERENCE TABLE Item Measurement item / Range (Display) Normal Condition Diagnostic Note SPEED METER Vehicle speed / Min : 0 km/h (0 mph), Max: 255 km/h (158 mph) Almost same as actual vehicle speed (When driving) - OK: Vehicle speed displayed on the tester is almost the same as the actual vehicle speed. NG: GO TO «COMBINATION METER»(ref-235585-S29802631042006062400000) OK: Go to next step
5. REPLACE DISTANCE CONTROL ECU ASSEMBLY Replace the distance control ECU assembly (See «REMOVAL»(ref-235581-S25051858082006062400000) ).
6. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC B2059 is not output. NG: REPLACE SEAT BELT CONTROL ECU OK: END

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck that the U0122 is not output. OK: DTC U0122 is not output. NG: GO TO «CAN COMMUNICATION SYSTEM»(ref-235565-S22980917632006062400000) OK: Go to next step
2. CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck that the DTC is not output. OK: DTC is not output. NG: GO TO «BRAKE CONTROL»(ref-235572) OK: Go to next step
3. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck that the DTC is not output. OK: DTC B2060 is not output. NG: REPLACE SEAT BELT CONTROL ECU OK: USE SIMULATION METHOD TO CHECK

1. INITIALIZE SEAT BELT CONTROL ECU Initialize the seat belt control ECU (See «INITIALIZATION»(ref-235580-S34151469302006062400000) ).
2. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC B2064 is not output. OK: USE SIMULATION METHOD TO CHECK NG: Go to next step
3. REPLACE GATEWAY ECU Replace the gateway ECU.
4. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC B2064 is not output. NG: REPLACE SEAT BELT CONTROL ECU OK: END

1. CHECK DTC OUTPUT (DYNAMIC RADAR CRUISE CONTROL SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Check for DTC. OK: DTC P1617 is not output. NG: GO TO «DYNAMIC RADAR CRUISE CONTROL SYSTEM»(ref-235581-S21981294072006062400000) OK: Go to next step
2. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM) Delete the DTC (See «TERMINALS OF ECU»(ref-235580-S10160782902006062400000) ). Recheck for DTC. OK: DTC B2065 is not output. NG: REPLACE SEAT BELT CONTROL ECU OK: USE SIMULATION METHOD TO CHECK