SEAT BELT WARNING SYSTEM TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

1. 

   Disconnect the main body ECU (multiplex network body ECU) connectors.

   Table 1. Text in Illustration

   *A

   for LHD

   *B

   for RHD

2. Measure the resistance and voltage according to the value(s) in the table below.

   Tip:

   Measure the values on the wire harness side with the connector disconnected.

   Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
   MB-30 (BECU) - Body ground	-	Auxiliary battery power supply	Power switch off	11 to 14 V
   MB-31 (ALTB) - Body ground	-	Auxiliary battery power supply	Power switch off	11 to 14 V
   MB-32 (IG) - Body ground	-	Ignition power supply (IG signal)	Power switch on (IG)→ off	11 to 14 V → Below 1 V
   MB-29 (ACC) - Body ground	-	Ignition power supply (ACC signal)	Power switch on (ACC)→ off	11 to 14 V → Below 1 V
   MB-11 (GND1) - Body ground	-	Ground	Always	Below 1 Ω
   H9-3 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   H11-3 (LCTY) - Body ground*	G - Body ground	Rear door courtesy light switch LH input	Rear door LH closed (OFF)	10 kΩ or higher
   H11-3 (LCTY) - Body ground*	G - Body ground	Rear door courtesy light switch LH input	Rear door LH open (ON)	Below 1 Ω
   H10-6 (RCTY) - Body ground*	B - Body ground	Rear door courtesy light switch RH input	Rear door RH closed (OFF)	10 kΩ or higher
   H10-6 (RCTY) - Body ground*	B - Body ground	Rear door courtesy light switch RH input	Rear door RH open (ON)	Below 1 Ω

   
   

   • *: w/ Rear Seat Belt Warning

   If the result is not as specified, there may be a malfunction in the wire harness.

CHECK COMBINATION METER ASSEMBLY

1. 

   Disconnect the H14 combination meter assembly connector.

2. Measure the resistance according to the value(s) in the table below.

   Tip:

   Measure the values on the wire harness side with the connector disconnected.

   Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
   H14-30 (ES) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω
   H14-10 (PBKL) - Body ground*1	V - Body ground*3 Y - Body ground*4	Front passenger seat belt buckle switch signal	Front passenger seat occupied, seat belt fastened	10 kΩ or higher
   H14-10 (PBKL) - Body ground*1	V - Body ground*3 Y - Body ground*4	Front passenger seat belt buckle switch signal	Front passenger seat occupied, seat belt unfastened	Below 1 Ω
   H14-9 (RLSB) - Body ground*2	Y - Body ground	Rear LH seat belt buckle switch signal	Rear LH seat belt fastened	10 kΩ or higher
   H14-9 (RLSB) - Body ground*2	Y - Body ground	Rear LH seat belt buckle switch signal	Rear LH seat belt unfastened	Below 1 Ω
   H14-8 (RCSB) - Body ground*2	L - Body ground	Rear center seat belt buckle switch signal	Rear center seat belt fastened	10 kΩ or higher
   H14-8 (RCSB) - Body ground*2	L - Body ground	Rear center seat belt buckle switch signal	Rear center seat belt unfastened	Below 1 Ω
   H14-7 (RRSB) - Body ground*2	LG- Body ground	Rear RH seat belt buckle switch signal	Rear RH seat belt fastened	10 kΩ or higher
   H14-7 (RRSB) - Body ground*2	LG - Body ground	Rear RH seat belt buckle switch signal	Rear RH seat belt unfastened	Below 1 Ω

   
   

   • *1: w/o Occupant Classification System

   • *2: w/ Rear Seat Belt Warning

   • *3: for LHD

   • *4: for RHD

   If the result is not as specified, there may be a malfunction in the wire harness.

3. Reconnect the H14 combination meter assembly connector.

4. Measure the voltage according to the value(s) in the table below.

   Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
   H14-22 (B) - Body ground	W - Body ground	Auxiliary battery power supply	Power switch off	11 to 14 V
   H14-21 (IG+) - Body ground	GR - Body ground	Ignition power supply (IG signal)	Power switch off	Below 1 V
   H14-21 (IG+) - Body ground	GR - Body ground	Ignition power supply (IG signal)	Power switch on (IG)	11 to 14 V

   If the result is not as specified, the combination meter assembly may have a malfunction.