Supplemental Restraint System (Diagnostics - Introduction): Diagnosis Lexus RX III

HOW TO PROCEED WITH TROUBLESHOOTING (TO 08/2009)

HINT

*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS Confirm problem symptoms. Refer to «TERMINALS OF ECU»(ref-400811-S19374919092011051800000) . NEXT: Go to next step
3. CHECK CAN COMMUNICATION SYSTEM* Use the Techstream to check if the CAN communication system is functioning normally. HINT: Refer to Bus Check for the CAN communication system. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-400834-S14071915672011051800000) . The center airbag sensor assembly is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system. Result Result Proceed to CAN communication DTC is not output. A CAN communication DTC is output. B B --> INSPECT CAN COMMUNICATION CIRCUIT. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-400834-S14071915672011051800000) A: Go to next step
4. SRS WARNING LIGHT CHECK Proceed to Diagnosis System. Refer to «DIAGNOSIS SYSTEM»(ref-400811-S16959918682011051800000) . NEXT: Go to next step
5. CHECK FOR DTC* Proceed to DTC Check / Clear. Refer to «DTC CHECK / CLEAR»(ref-400811-S35984818542011051800000) . Result Result Proceed to DTC is output. A DTC is not output. B B --> GO TO STEP 7 A: Go to next step
6. DIAGNOSTIC TROUBLE CODE CHART Proceed to Diagnostic Trouble Code Chart. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-400811-S03730430612011051800000) . NEXT --> GO TO STEP 9
7. SYMPTOM SIMULATION Proceed to Diagnosis System. Refer to «DIAGNOSIS SYSTEM»(ref-400811-S16959918682011051800000) . NEXT: Go to next step
8. PROBLEM SYMPTOMS TABLE Proceed to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400811-S16755849102011051800000) . NEXT: Go to next step
9. CIRCUIT INSPECTION* NEXT: Go to next step
10. IDENTIFICATION OF PROBLEM NEXT: Go to next step
11. REPAIR OR REPLACEMENT NEXT: Go to next step
12. CONFIRMATION TEST NEXT --> END

HOW TO PROCEED WITH TROUBLESHOOTING (FROM 08/2009)

HINT

*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS Confirm problem symptoms. Refer to «TERMINALS OF ECU»(ref-400811-S20589258192011051800000) . NEXT: Go to next step
3. CHECK CAN COMMUNICATION SYSTEM* Use the Techstream to check if the CAN communication system is functioning normally. HINT: Refer to Bus Check for the CAN communication system. Refer to «DIAGNOSIS SYSTEM»(ref-400834-S01955420032011051800000) . The center airbag sensor assembly is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system. Result Result Proceed to CAN communication DTC is not output. A CAN communication DTC is output. B B --> INSPECT CAN COMMUNICATION CIRCUIT. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-400834-S34883510432011051800000) A: Go to next step
4. SRS WARNING LIGHT CHECK Proceed to Diagnosis System. Refer to «DIAGNOSIS SYSTEM»(ref-400811-S33565571392011051800000) . NEXT: Go to next step
5. CHECK FOR DTC* Proceed to DTC Check / Clear. Refer to «DTC CHECK / CLEAR»(ref-400811-S31749659202011051800000) . Result Result Proceed to DTC is output. A DTC is not output. B B --> GO TO STEP 7 A: Go to next step
6. DIAGNOSTIC TROUBLE CODE CHART Proceed to Diagnostic Trouble Code Chart. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-400811-S02490402752011051800000) . NEXT --> GO TO STEP 9
7. SYMPTOM SIMULATION Proceed to Diagnosis System. Refer to «DIAGNOSIS SYSTEM»(ref-400811-S33565571392011051800000) . NEXT: Go to next step
8. PROBLEM SYMPTOMS TABLE Proceed to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE»(ref-400811-S13355816202011051800000) . NEXT: Go to next step
9. CIRCUIT INSPECTION* NEXT: Go to next step
10. IDENTIFICATION OF PROBLEM NEXT: Go to next step
11. REPAIR OR REPLACEMENT NEXT: Go to next step
12. CONFIRMATION TEST NEXT --> END

PROBLEM SYMPTOMS TABLE

HINT

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

AIRBAG SYSTEM

HINT

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

AIRBAG SYSTEM

Scheme 172

1. CENTER AIRBAG SENSOR Terminal No. Symbol Destination F29-1 P2+ Front passenger airbag assembly (Front passenger side squib 2nd step) F29-2 P2- Front passenger airbag assembly (Front passenger side squib 2nd step) F29-3 P- Front passenger airbag assembly (Front passenger side squib) F29-4 P+ Front passenger airbag assembly (Front passenger side squib) F29-5 D+ Steering pad (Driver side squib) F29-6 D- Steering pad (Driver side squib) F29-7 D2- Steering pad (Driver side squib 2nd step) F29-8 D2+ Steering pad (Driver side squib 2nd step) F29-9 DK+ Driver side knee airbag assembly (Driver side knee airbag squib) F29-10 DK- Driver side knee airbag assembly (Driver side knee airbag squib) F29-13 CANH CAN communication line F29-17 P-AB Passenger airbag ON/OFF indicator F29-18 GSW Main body ECU F29-19 PK+ Front passenger side knee airbag assembly (Front passenger side knee airbag squib) F29-20 PK- Front passenger side knee airbag assembly (Front passenger side knee airbag squib) F29-21 IG2 IGN fuse F29-22 CANL CAN communication line F29-23 PAON Passenger airbag ON/OFF indicator F29-25 E1 Ground F29-26 E2 Ground F29-27 -SR Front airbag sensor RH F29-28 -SL Front airbag sensor LH F29-29 +SR Front airbag sensor RH F29-30 +SL Front airbag sensor LH P10-1 SFL+ Front seat side airbag assembly LH (Side squib LH) P10-2 SFL- Front seat side airbag assembly LH (Side squib LH) P10-3 ICL- Curtain shield airbag assembly LH (Curtain shield squib LH) P10-4 ICL+ Curtain shield airbag assembly LH (Curtain shield squib LH) P10-5 PL+ Front seat outer belt assembly LH (Front pretensioner squib LH) P10-6 PL- Front seat outer belt assembly LH (Front pretensioner squib LH) P10-7 PLR- Rear seat outer belt assembly LH (Rear pretensioner squib LH) P10-8 PLR+ Rear seat outer belt assembly LH (Rear pretensioner squib LH) P10-9 LSP+ Seat position airbag sensor P10-10 LBE+ Front seat inner belt assembly LH (Seat belt buckle switch LH) P10-15 RL- Rear seat side airbag assembly LH (Rear side squib LH) P10-16 RL+ Rear seat side airbag assembly LH (Rear side squib LH) P10-17 LSP- Seat position airbag sensor P10-18 LBE- Front seat inner belt assembly LH (Seat belt buckle switch LH) P10-23 BBL- Side airbag sensor LH P10-24 BBL+ Side airbag sensor LH O8-1 PRR+ Rear seat outer belt assembly RH (Rear pretensioner squib RH) O8-2 PRR- Rear seat outer belt assembly RH (Rear pretensioner squib RH) O8-3 PR- Front seat outer belt assembly RH (Front pretensioner squib RH) O8-4 PR+ Front seat outer belt assembly RH (Front pretensioner squib RH) O8-5 ICR+ Curtain shield airbag assembly RH (Curtain shield squib RH) O8-6 ICR- Curtain shield airbag assembly RH (Curtain shield squib RH) O8-7 SFR- Front seat side airbag assembly RH (Side squib RH) O8-8 SFR+ Front seat side airbag assembly RH (Side squib RH) O8-9 RR+ Rear seat side airbag assembly RH (Rear side squib RH) O8-10 RR- Rear seat side airbag assembly RH (Rear side squib RH) O8-16 FSR+ Occupant classification ECU O8-17 BBR+ Side airbag sensor RH O8-18 BBR- Side airbag sensor RH O8-24 FSR- Occupant classification ECU

DTC CHECK / CLEAR

1. DTC CHECK (USING SST CHECK WIRE) Check the DTCs (Present trouble codes). Turn the engine switch on (IG), and wait for approximately 60 seconds. Using SST, connect terminals TC and CG of the DLC3. SST: 09843-18040 NOTE: Connect the terminals to the correct positions to avoid a malfunction. Check the DTCs (Past trouble codes). Using SST, connect terminals TC and CG of the DLC3. SST: 09843-18040 NOTE: Connect the terminals to the correct positions to avoid a malfunction. Turn the engine switch on (IG), and wait for approximately 60 seconds. Read the DTCs. Read the blinking patterns of the DTCs. As examples, the blinking patterns for the normal system code and trouble codes 11 and 31 are shown in the illustration. Normal system code indication (without past trouble code) The light blinks twice per second. Normal system code indication (with past trouble code) When the past trouble code is stored in the center airbag sensor assembly, the light blinks only once per second. Trouble code indication The first blinks indicate the first DTC. The second blinks occur after a 1.5-second pause. If there is more than 1 code, there will be a 2.5-second pause between each code. After all codes are shown, there will be a 4.0-second pause, and then all codes will be repeated. HINT: If 2 or more malfunctions are found, the indication begins with the smaller-numbered code. If DTCs are indicated without connecting the terminals, proceed to TC and CG Terminal Circuit. Refer to «TC and CG Terminal Circuit»(ref-400947-S24790630122011051800000) .
2. DTC CLEAR (USING SST CHECK WIRE) Clear the DTCs. When the engine switch is turned off, the DTCs are cleared. HINT: Depending on the DTC, the code may not be cleared by turning off the engine switch. In this case, proceed to the next procedure. Using SST, connect terminals TC and CG of the DLC3, and then turn the engine switch on (IG). SST: 09843-18040 Disconnect terminal TC of the DLC3 within 3 to 10 seconds after the DTCs are output, and check if the SRS warning light comes on after 3 seconds. Within 2 to 4 seconds after the SRS warning light comes on, connect terminals TC and CG of the DLC3. The SRS warning light should go off within 2 to 4 seconds after connecting terminals TC and CG of the DLC3. Then, disconnect terminal TC within 2 to 4 seconds after the SRS warning light goes off. The SRS warning light comes on again within 2 to 4 seconds after disconnecting terminal TC. Then, reconnect terminals TC and CG within 2 to 4 seconds after the SRS warning light comes on. Check if the SRS warning light goes off within 2 to 4 seconds after connecting terminals TC and CG of the DLC3. Also check if the normal system code is output within 1 second after the SRS warning light goes off. If DTCs are not cleared, repeat this procedure until the codes are cleared.
3. DTC CHECK (USING TECHSTREAM) Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Body Electrical / SRS Airbag / Trouble Codes. Check the DTCs by following the prompts on the Techstream screen. HINT: Refer to the Techstream operator's service information for further details.
4. DTC CLEAR (USING TECHSTREAM) Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Body Electrical / SRS Airbag / Trouble Codes. Clear the DTCs by following the prompts on the Techstream screen. HINT: Refer to the Techstream operator's service information for further details.

DATA LIST / ACTIVE TEST

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.

1. DATA LIST FOR CENTER AIRBAG SENSOR ASSEMBLY Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / SRS Airbag / Data List. Check the values by referring to the table below. SRS AIRBAG (CENTER AIRBAG SENSOR ASSEMBLY) Tester Display Measurement Item/Range Normal Condition Diagnostic Note Driver Seat Position Driver Seat Position/ Forward: Seat position is forward Bkward: Seat position is backward Fail: Failure detected Forward/Bkward - Passenger Classification Passenger Classification/ NG: Date is not determined OFF: Vacant Child: Child (less than 32 kg (70.6 lb)) is seated AF05: Adult (36 to 54 kg (79.37 to 119.05 lb)) is seated AM50: Adult (more than 54 kg (119.05 lb)) is seated Fail: A failure is detected OFF/Child/AF05/AM50 - Left Side Buckle SW LH Side Buckle SW/ Unset: The seat belt is not fastened Set: The seat belt is fastened NG: Data is not determined Unset/Set - Right Side Buckle SW RH Side Buckle SW/ Unset: The seat belt is not fastened Set: The seat belt is fastened NG: Data is not determined Unset/Set - Display Type Information Display Type Information/ LR: The display is indicated by LH/RH DP: The display is indicated by Driver/Passenger LR - Number of Past DTC Number of Past DTC/ Min.: 0, Max.: 255 0

DIAGNOSTIC TROUBLE CODE CHART

If a trouble code is displayed during the DTC check, check the circuit listed for the code in the table below (refer to the appropriate information).

HINT

1. When the SRS warning light remains on and the DTC output is the normal system code, a voltage source drop is likely to occur. This malfunction is not stored in the memory by the center airbag sensor assembly. If the power source voltage returns to normal, the SRS warning light will automatically go off.
2. When 2 or more codes are indicated, the code with the lower number appears first.
3. If a code is not listed on the display chart, the center airbag sensor assembly may have failed.
4. In the case of any malfunction concerning an open circuit, short to ground, or short to B+ due to a squib, other trouble codes may not be detected. In this case, repair the malfunction currently indicated and then perform malfunction diagnosis again.
5. Mark in the check mode column: *1: DTC does not correspond to check mode. *2: DTC corresponds to check mode.

AIRBAG SYSTEM

If a trouble code is displayed during the DTC check, check the circuit listed for the code in the table below (refer to the appropriate information).

HINT

1. When the SRS warning light remains on and the DTC output is the normal system code, a voltage source drop is likely to occur. This malfunction is not stored in the memory by the center airbag sensor assembly. If the power source voltage returns to normal, the SRS warning light will automatically go off.
2. When 2 or more codes are indicated, the code with the lower number appears first.
3. If a code is not listed on the display chart, the center airbag sensor assembly may have failed.
4. In the case of any malfunction concerning an open circuit, short to ground, or short to B+ due to a squib, other trouble codes may not be detected. In this case, repair the malfunction currently indicated and then perform malfunction diagnosis again.
5. Mark in the check mode column: *1: DTC does not correspond to check mode. *2: DTC corresponds to check mode.

AIRBAG SYSTEM