Occupant Classification System (Diagnostics - Introduction): Diagnosis Toyota Matrix E140

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS Confirm problem symptoms. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-427305-S34248619712011101200000) . NEXT: Go to next step
3. PASSENGER AIRBAG ON/OFF INDICATOR CHECK Proceed to Diagnosis System. Refer to «DIAGNOSIS SYSTEM»(ref-427321-S24413371612011101200000) . NEXT: Go to next step
4. DTC CHECK (Present and Past DTCs)* Proceed to DTC Check / Clear. Refer to «DTC CHECK / CLEAR»(ref-427321-S11792232962011101200000) . Result Result Proceed to DTC is output. A DTC is not output. B B --> GO TO PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-427321-S40988100432011101200000) A: Go to next step
5. DIAGNOSTIC TROUBLE CODE CHART Proceed to Diagnostic Trouble Code Chart. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-427321-S09185418472011101200000) . NEXT: Go to next step
6. CIRCUIT INSPECTION* NEXT: Go to next step
7. REPAIR NEXT: Go to next step
8. CLEAR DTC (Present and Past DTCs)* Proceed to DTC Check / Clear. Refer to «DTC CHECK / CLEAR»(ref-427321-S11792232962011101200000) . NEXT: Go to next step
9. DTC CHECK (Present and Past DTCs)* Proceed to DTC Check / Clear. Refer to «DTC CHECK / CLEAR»(ref-427321-S11792232962011101200000) . 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-427321-S09185418472011101200000) A: Go to next step
10. SYMPTOM SIMULATION Check the passenger airbag ON/OFF indicator operation. Result Result Proceed to Passenger airbag ON/OFF indicator operates normally. A Passenger airbag ON/OFF indicator ("OFF") and SRS warning light come on. B B --> GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-427321-S09185418472011101200000) A: Go to next step
11. 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.

OCCUPANT CLASSIFICATION SYSTEM

Scheme 1

1. OCCUPANT CLASSIFICATION ECU Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition S2-3 (GSP) - S2-5 (GND) O - W-B Seat position sensor (for front passenger side) ground line Always Below 1 ohms S2-4 (SP) - S2-5 (GND) V - W-B Seat position sensor (for front passenger side) ground line Always Low: 5.0 to 6.9 mA Hi: 12 to 17 mA S2-5 (GND) - Body ground W-B - Body ground Occupant classification ECU ground line Always Below 1 V S2-6 (PS) - S2-15 (GPS) W - GR Pressure sensor signal line Ignition switch ON Below 1 V S2-7 (VPS) - S2-5 (GND) LG - W-B Pressure sensor +B line Ignition switch ON 4.75 to 5.25 V S2-8 (GBT) - S2-5 (GND) Y - W-B Belt tension sensor ground line Always Below 1 V S2-9 (IG) - S2-5 (GND) B - W-B Occupant classification ECU +B line Ignition switch ON 10 to 14 V S2-10 (DIA) - S2-5 (GND) W - W-B Diagnosis (DLC3) Ignition switch ON Pulse generation S2-11 (FSR+) - S2-12 (FSR-) W - B Center airbag sensor assembly communication line Ignition switch ON Pulse generation S2-12 (FSR-) - S2-5 (GND) B - W-B Center airbag sensor assembly communication line (-) Always Below 1 V S2-13 (BSW) - S2-14 (BGND) G - P Passenger side buckle switch line Ignition switch ON Low: 4 to 7 mA Hi: 12 to 18 mA S2-14 (BGND) - S2-5 (GND) P - W-B Passenger side buckle switch ground line Always Below 1 V S2-15 (GPS) - S2-5 (GND) GR - W-B Pressure sensor ground line Always Below 1 V S2-16 (BT) - S2-5 (GND) R - W-B Belt tension sensor signal line Ignition switch ON 0 to 5 V S2-17 (VBT) - S2-5 (GND) G - W-B Belt tension sensor +B line Ignition switch ON 4.75 to 5.25 V

Scheme 2

Scheme 3

Scheme 4

1. CHECK DLC3 Check the DLC3. Refer to «GENERAL INFORMATION»(ref-427305-S15629809542011101200000) .
2. SYMPTOM SIMULATION HINT: The most difficult case in troubleshooting is when no symptoms occur. In such cases, a thorough customer problem analysis must be carried out. Then the same or similar conditions and the environment in which the problem occurred in the customer's vehicle should be simulated. No matter how experienced or skilled a technician may be, if he/she proceeds to troubleshooting without confirming the problem symptoms, he/she will likely overlook something important and make a wrong guess at some points in the repair operation. This leads to a standstill in troubleshooting. Vibration method: When vibration seems to be the major cause. HINT: Perform the simulation method only during the primary check period of approximately 6 seconds after the ignition switch is turned to ON. Slightly vibrate the part of the sensor considered to be the problem cause 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.
3. FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR Initial check Turn the ignition switch to 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 to ON, the passenger airbag ON/OFF indicator will indicate ON or OFF depending on the conditions listed below. Front Passenger Seat Condition Passenger Airbag ON/OFF Indicator SRS Warning Light ON Indicator OFF Indicator Vacant OFF OFF OFF Adult is seated ON OFF OFF Child is seated. OFF ON OFF Child restraint system is set. OFF ON OFF Front passenger occupant classification failure OFF ON ON HINT: The passenger airbag ON/OFF indicator is 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.
4. CHECK PASSENGER AIRBAG ON/OFF INDICATOR Turn the ignition switch to 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 the ignition switch is turned to ON and approximately 6 seconds pass.

DTC CHECK / CLEAR

HINT

Use the Techstream to read and clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be read and cleared.

1. DTC CHECK Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON and turn the Techstream on. Enter the following menus: Body Electrical / Occupant Detection / Trouble Code. Check the DTCs by following the prompts on the Techstream screen. HINT: Refer to the Techstream operator's manual for further details.
2. DTC CLEAR Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON and turn the Techstream on. Enter the following menus: Body Electrical / Occupant Detection / Trouble Code. Clear the DTCs by following the prompts on the Techstream screen. HINT: Refer to the Techstream operator's manual 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 OCCUPANT CLASSIFICATION ECU Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON and turn the Techstream on. Enter the following menus: Body Electrical / Occupant Detection / Data List. Check the values by referring to the table below. HINT: The "Specified Condition for Zero Point Calibration" in the table below must be satisfied when zero point calibration is performed. DATA LIST Tester Display Measurement Item/Range Normal Condition Specified Condition for Zero Point Calibration Diagnostic Note Passenger Classification Passenger classification/ NG: Data is not determined AM50: Adult is seated and seat is in rear position AF05: Adult is seated and seat is in front position CHILD: Child is seated OFF: Vacant AM50/AF05/CHILD/OFF OFF - Passenger Buckle SW Buckle switch (Passenger side)/ Set: Passenger side seat belt is fastened Unset: Passenger side seat belt is unfastened NG: Data is not determined Unset/Set Unset - Pressure Sensor Output Pressure sensor output/ Min.: 0 Max.: 255 0 to 210 0 to 2 - Filtered Pressure Sensor Output Filtered pressure sensor output/ Min.: 0 Max.: 255 38 to 240 38 to 75 If value is outside range of "Specified Condition for Zero Point Calibration", check whether any objects placed on seat cushion and that seat cushion fitted correctly. Thermistor Temperature Output Thermistor temperature output/ Min.: -40°C (-40°F) Max.: 90°C (194°F) -40 to 85°C (-40 to 185°F) 3 to 40°C (37 to 104°F) If value is outside range of "Specified Condition for Zero Point Calibration", adjust temperature to proper range by using air conditioner, etc. Weight Threshold Weight threshold/ Min.: 0 Max.: 255 36 to 67 (reference value) 36 to 67 (reference value) - Filtered Belt Tension Output Filtered belt tension output/ Min.: 0 Max.: 255 39 to 229 39 to 64 (no load) - Empty Threshold Value from the Seat Factory Empty threshold value from seat factory/ Min.: 0 Max.: 255 38 to 75 38 to 75 - Allow Threshold Threshold value for adult passenger or not from seat factory/ Min.: 0 Max.: 255 43 to 64 (reference value) 43 to 64 (reference value) - Number of Present DTC Number of present trouble codes/ Min.: 0 Max.: 255 0 0 - Number of Past DTC Number of past trouble codes/ Min.: 0 Max.: 255 0 0

DIAGNOSTIC TROUBLE CODE CHART

HINT

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.

OCCUPANT CLASSIFICATION SYSTEM