SEAT BELT SEAT BELT WARNING SYSTEM Seat belt warning system PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the causes 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. Symptom Suspected area See page Front driver seat belt warning light does not operate Front passenger seat belt warning light does not operate Seat belt warning buzzer does not sound (Front driver and front passenger seat belt warning lights operate normally) Front seat inner belt assembly (Driver side) Wire harness Combination meter assembly - - - Front seat inner belt assembly (Passenger side) - Wire harness - Occupant classification ECU - Center airbag sensor assembly - Combination meter assembly - Air conditioning amplifier - Integration control and panel assembly (Front passenger seat belt warning light) - Combination meter assembly ME-
SEAT BELT SEAT BELT WARNING SYSTEM TERMINALS OF ECU. COMBINATION METER ASSEMBLY E E E9E0 (a) (b) Disconnect the E combination meter assembly Measure the voltage and resistance of the wire harness side Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition E- (B) - Body R - Body Battery Always to V E- (IG+) - Body R-L - Body Ignition switch signal Ignition switch OFF ON Below V to V E- (ES) - Body W-B - Body Ground Always Below Ω (c) (d) Reconnect the combination meter assembly Measure the voltage of the wire harness side Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition E- (WRNP) - Body E- (WRNP) - Body LG - Body LG - Body E- (L) - Body G-Y - Body E- (L) - Body G-Y - Body E-0 (PBKL) - Body E-0 (PBKL) - Body L-R - Body L-R - Body Seat belt warning light signal (Front passenger side) Seat belt warning light signal (Front passenger side) (Front driver side) (Front driver side) (Front passenger side) (Front passenger side) Front passenger seat is occupied and its seat belt is unfastened Front passenger seat is occupied and its seat belt is fastened Front seat belt is unfastened (Front driver side) Front seat belt is fastened (Front driver side) Front seat belt is unfastened (Front passenger side) Front seat belt is fastened (Front passenger side) Alternating between to V and below V Below V Below V 9 to V Below V to V
SEAT BELT SEAT BELT WARNING SYSTEM. CENTER AIRBAG SENSOR ASSEMBLY E9 L K C0E0 Terminal No. Terminal Symbol Destination E9- PBEW Combination meter assembly E9- IG IGN fuse E9- E Ground K- FSP+ Occupant Classification ECU K- FSP- Occupant Classification ECU. OCCUPANT CLASSIFICATION ECU Q Q (a) (b) (c) (d) Disconnect the Q occupant classification ECU Measure the voltage and resistance of the wire harness side Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition Q- (+B) - Body W-R - Body Battery Always to V Q- (GND) - Body W-B - Body Ground Always Below Ω Q- (IG) - Body B-O - Body Ignition switch signal Ignition switch OFF ON Below V to V Reconnect the occupant classification ECU Measure the resistance of the wire harness side Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition Q- (FSR-) - Q- (GND) B - W-B Q- (BGND) - Q- (GND) GR - W-B Center airbag sensor assembly communication line (-) Passenger side buckle switch line Always Always Below Ω Below Ω H00909E
SEAT BELT SEAT BELT WARNING SYSTEM Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition Q- (FSR+) - Q- (FSR- ) Q-9 (BSW) - Q- (BGND) W - B L - GR Center airbag sensor assembly communication line Passenger side buckle switch line Buckle switch ON Buckle switch OFF Pulse generation Pulse generation
SEAT BELT SEAT BELT WARNING SYSTEM. MAIN BODY ECU (Driver Side J/B) Main Body ECU (Driver Side J/B): Left View: E E E 9 0 9 0 9 0 9 0 9 0 9 0 9 0 E E E Rear View: A B 0 9 0 9 A B 0 9 C D C D E E F F 0 9 0 9 0 9 B0E0
SEAT BELT SEAT BELT WARNING SYSTEM Main Body ECU (Driver Side J/B): Front View: H J G 9 0 9 0 9 0 G H J K L K L 9 0 9 0 9 0 B0E0 (a) Disconnect the A, B and H main body ECU (driver side J/B) connectors.