Occupant Classification System (Diagnostics - Introduction): Diagnosis Scion xD I

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use these procedures to troubleshoot the occupant classification system.
2. *: Use a Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS Confirm customer problem symptoms. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-388639-S13424876092011031100000) . NEXT: Go to next step
3. CHECK FOR DTC* Check for DTCs and note any codes that are output. Refer to «DTC CHECK / CLEAR»(ref-388797-S14360807342011031100000) . Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-388797-S14360807342011031100000) . Recheck for DTCs. Refer to «DTC CHECK / CLEAR»(ref-388797-S14360807342011031100000) . Based on the DTCs output above, try to force output of the same CAN communication system DTC or occupant classification system DTC by simulating the symptoms indicated by the DTC. RESULT Result Proceed to DTC does not output A CAN communication system DTC outputs B Occupant classification system DTC outputs C B --> Go to DIAGNOSTIC TROUBLE CODE CHART. Refer to «DIAGNOSIS SYSTEM»(ref-388782-S32127553342011031100000) C --> Go to DIAGNOSTIC TROUBLE CODE CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-388797-S33931081532011031100000) A: Go to next step
4. PROBLEM SYMPTOMS TABLE Refer to «PROBLEM SYMPTOMS TABLE»(ref-388797-S35341382142011031100000) . 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 6 A: Go to next step
5. OVERALL ANALYSIS AND TROUBLESHOOTING* Terminals of ECU. Refer to «TERMINALS OF ECU»(ref-388797-S40887349842011031100000) DATA LIST / ACTIVE TEST. Refer to «DATA LIST / ACTIVE TEST»(ref-388797-S36376001072011031100000) NEXT: Go to next step
6. REPAIR OR REPLACE NEXT: Go to next step
7. 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.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

OCCUPANT CLASSIFICATION SYSTEM

Scheme 263

1. CHECK OCCUPANT CLASSIFICATION ECU Terminal No. (Symbol) Wiring Color Terminal Description Condition Specification L27-1 (+B) - L27-3 (GND) V - W-B Battery Ignition switch ON 11 to 14 V L27-2 (DIA) - L27-3 (GND) G - W-B Diagnosis (DLC3) Ignition switch ON Pulse generation L27-3 (GND) - Body ground W-B - Body ground Ground Always Below 1 ohms L27-4 (FSR-) - L27-3 (GND) Y - W-B Center airbag sensor communication ground line Always Below 1 ohms L27-5 (BGND) - L27-3 (GND) P - W-B Passenger side buckle switch ground line Always Below 1 ohms L27-7 (IG) - L27-3 (GND) BE - W-B Power source (IGN fuse) Ignition switch ON 11 to 14 V L27-8 (FSR+) - L27-4 (FSR-) GR - Y Center airbag sensor communication line Ignition switch ON Pulse generation L27-9 (BSW) - L27-5 (BGND) BE - P Passenger side buckle switch line Seat belt is fastened 12 to 18 mA Seat belt is unfastened 4 to 7 mA z8-1 (SGD1) - L27-3 (GND) G - W-B Front occupant classification sensor LH ground line Always Below 1 ohms z8-2 (SGD2) - L27-3 (GND) O - W-B Front occupant classification sensor RH ground line Always Below 1 ohms z8-3 (SGD3) - L27-3 (GND) W - W-B Rear occupant classification sensor LH ground line Always Below 1 ohms z8-4 (SGD4) - L27-3 (GND) BR - W-B Rear occupant classification sensor RH ground line Always Below 1 ohms z8-11 (SVC1) - z8-1 (SGD1) R - G Front occupant classification sensor LH power supply line Ignition switch ON, load is applied to front occupant classification sensor LH 4.5 to 5.1 V z8-12 (SVC2) - z8-2 (SGD2) W - O Front occupant classification sensor RH power supply line Ignition switch ON, load is applied to front occupant classification sensor RH 4.5 to 5.1 V z8-5 (SVC3) - z8-3 (SGD3) GR - W Rear occupant classification sensor LH power supply line Ignition switch ON, load is applied to rear occupant classification sensor LH 4.5 to 5.1 V z8-6 (SVC4) - z8-4 (SGD4) V - BR Rear occupant classification sensor RH power supply line Ignition switch ON, load is applied to rear occupant classification sensor RH 4.5 to 5.1 V z8-7 (SIG1) - z8-1 (SGD1) SB - G Front occupant classification sensor LH signal line Ignition switch ON, load is applied to front occupant classification sensor LH Pulse generation z8-8 (SIG2) - z8-2 (SGD2) L - O Front occupant classification sensor RH signal line Ignition switch ON, load is applied to front occupant classification sensor RH Pulse generation z8-9 (SIG3) - z8-3 (SGD3) Y - W Rear occupant classification sensor LH signal line Ignition switch ON, load is applied to rear occupant classification sensor LH Pulse generation z8-10 (SIG4) - z8-4 (SGD4) R - BR Rear occupant classification sensor RH signal line Ignition switch ON, load is applied to rear occupant classification sensor RH Pulse generation

Scheme 264

Scheme 265

Scheme 266

1. SYMPTOM SIMULATION HINT: The most difficult case in troubleshooting is when no problem symptoms occur. In such a case, a thorough problem analysis must be carried out. A simulation of the same or similar conditions and environment in which the problem occurred in the customer's vehicle should be carried out. Troubleshooting without confirming the problem symptoms will lead to important repairs being overlooked and mistakes or delays. Vibration method: When vibration seems to be the major cause. HINT: Perform the simulation method only during the primary check period (for approximately 6 seconds after the ignition switch is turned ON). Slightly vibrate the part of the sensor considered to be the cause of the problem with your fingers and check whether the malfunction occurs. HINT: Shaking the relays too strongly may result in open relays. Slightly shake the connector vertically and horizontally. Slightly shake the wire harness vertically and horizontally. The connector joint and fulcrum of the vibration are the major areas to be checked thoroughly. Simulation method for DTC B1795: Turn the ignition switch from OFF to ON, hold it for 10 seconds, and then turn it back to OFF. Repeat this procedure 50 times in a row. HINT: DTC B1795 is output if the occupant classification ECU receives the ignition switch OFF-ON-OFF signal 50 times in a row when a malfunction occurs in the power circuit for the occupant classification system.
2. FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR Initial check Turn the ignition switch ON. The passenger airbag ON/OFF indicator (ON and OFF) comes on for approximately 4 seconds, then goes off for approximately 2 seconds. Approximately 6 seconds after the ignition switch is turned ON, the passenger airbag ON/OFF indicator will be ON/OFF depending on the conditions listed below. Front Seat Passenger ON Indicator OFF Indicator SRS Warning Light Adult seated ON OFF OFF Child seated / Child restraint system set OFF ON OFF Vacant OFF OFF OFF Passenger occupant classification system failure OFF ON ON HINT: The passenger airbag ON/OFF indicator operates based on the timing chart below in order to check the indicator light circuit. When the occupant classification system has trouble, both the SRS warning light and the passenger airbag ON/OFF indicator (OFF) come on. In this case, check the DTCs in the airbag system first.
3. CHECK PASSENGER AIRBAG ON/OFF INDICATOR Turn the ignition switch ON. Check that the passenger airbag ON/OFF indicator (ON and OFF) comes on for approximately 4 seconds, then goes off for approximately 2 seconds. HINT: Refer to the table in the previous step regarding the passenger airbag ON/OFF indicator when approximately 6 seconds have elapsed after the ignition switch is turned ON.

DTC CHECK / CLEAR

1. CHECK DTC HINT: When DTC B1650/23 is detected as a result of troubleshooting the airbag system, troubleshoot the occupant classification system. Use a Techstream to read and clear DTCs, otherwise the DTCs cannot be read and cleared. Connect the Techstream to the DLC3. Turn the ignition switch ON. Turn the tester on. Enter the following menus: Body Electrical / Occupant Detection / Trouble Codes.
2. CLEAR DTC Connect a Techstream to the DLC3. Turn the ignition switch ON. Turn the tester on. Enter the following menus: Body Electrical / Occupant Detection / Trouble Codes. Clear the DTCs.

DATA LIST / ACTIVE TEST

1. READ DATA LIST HINT: Using a 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 ignition switch ON. Turn the tester on. Enter the following menus: Body Electrical / Occupant Detection / Data List. According to the display on the tester, read the "Data List". Tester Display Measurement Item/Range Normal Condition Diagnostic Note IG Switch Ignition switch condition/ ON: Ignition switch ON OFF: Ignition switch OFF ON/OFF - Passenger Buckle SW Passenger side buckle switch/ Set: The seat belt is fastened Unset: The seat belt is not fastened NG: Data is not determined Set/Unset - Passenger Classification Passenger classification/ AM50: Adult (more than 54 kg (119.05 lb)) is seated AF05: Adult (36 to 54 kg (79.37 to 119.05 lb)) is seated Child: Child (less than 36 kg (79.37 lb)) is seated CRS: Child restraint system (less than 7 kg (15.43 lb)) and passenger side buckle switch are ON, then 7 to 36 kg (15.43 to 79.37 lb) is set OFF: Vacant AM50/AF05/Child/CRS/OFF - Sensor Range Info Sensor range information/ OK: The value of a sensor is within the range NG: The value of a sensor is over the range OK - FL Sensor Range Info Front left sensor range information/ OK: Sensor range is -17 to 27 kg (-37.48 to 59.52 lb) Min.: Less than -17 kg (-37.48 lb) Max.: More than 27 kg (59.52 lb) OK - FR Sensor Range Info Front right sensor range information/ OK: Sensor range is -17 to 27 kg (-37.48 to 59.52 lb) Min.: Less than -17 kg (-37.48 lb) Max.: More than 27 kg (59.52 lb) OK - RL Sensor Range Info Rear left sensor range information/ OK: Sensor range is -17 to 37 kg (-37.48 to 81.57 lb) Min.: Less than -17 kg (-37.48 lb) Max.: More than 37 kg (81.57 lb) OK - RR Sensor Range Info Rear right sensor range information/ OK: Sensor range is -17 to 37 kg (-37.48 to 81.57 lb) Min.: Less than -17 kg (-37.48 lb) Max.: More than 37 kg (81.57 lb) OK - FL Sensor Voltage Front left sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - FR Sensor Voltage Front right sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - RL Sensor Voltage Rear left sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - RR Sensor Voltage Rear right sensor voltage/ Min.: 0 V Max.: 19.8 V 0 to 4.7 V - FL Sensor Weight Info Front left sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 27 kg (59.52 lb) -17 to 27 kg (-37.48 to 59.52 lb) - FR Sensor Weight Info Front right sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 27 kg (59.52 lb) -17 to 27 kg (-37.48 to 59.52 lb) - RL Sensor Weight Info Rear left sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 37 kg (81.57 lb) -17 to 37 kg (-37.48 to 81.57 lb) - RR Sensor Weight Info Rear right sensor weight information/ Min.: -17 kg (-37.48 lb) Max.: 37 kg (81.57 lb) -17 to 37 kg (-37.48 to 81.57 lb) - Total Weight Information Total weight information/ Min.: -68 kg (-149.91 lb) Max.: 128 kg (282.19 lb) -68 to 128 kg (-149.91 to 282.19 lb) - Number of Present DTC Number of present DTC recorded/ Min.: 0, Max.: 255 0 - Number of Past DTC Number of past DTC recorded/ Min.: 0, Max.: 255 0

DIAGNOSTIC TROUBLE CODE CHART

HINT

1. When DTC B1650/32 is detected as a result of troubleshooting for the "AIRBAG SYSTEM", perform troubleshooting for the "OCCUPANT CLASSIFICATION SYSTEM" as shown in the chart below.
2. Use a Techstream to read and clear the DTC of the occupant classification ECU, otherwise the DTCs cannot be read and cleared.

OCCUPANT CLASSIFICATION SYSTEM