Power Source Circuit: Procedure

1. Disconnect the D84 seat belt control ECU connectors.
   Fig 1: Measuring Resistance Of Seat Belt Control ECU (GND Circuit)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D84-8 (PGND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Seat Belt Control ECU)

3. Reconnect the seat belt control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

OK: Go to next step 

1. Disconnect the D83 and D84 seat belt control ECU connectors.
   Fig 2: Measuring Voltage Of Seat Belt Control ECU (IG1 Circuit)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D83-8 (IG1) - D84-8 (PGND)	Ignition switch ON	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Seat Belt Control ECU)

4. Reconnect the seat belt control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 

OK: Go to next step 

1. Disconnect the D84 seat belt control ECU connectors.
   Fig 3: Measuring Voltage Of Seat Belt Control ECU (+B Circuit)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D84-7 (+B) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Seat Belt Control ECU)

3. Reconnect the seat belt control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (+B CIRCUIT) 

OK → See step   4