Power Source Circuit: Procedure

1. Disconnect the seat belt control ECU connector.
   Fig 1: Identifying Seat Belt Control ECU Connector Terminals

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

   Standard Resistance

   Tester Display	Condition	Specified Condition
   L2-8 (GND) - 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 seat belt control ECU connector.
   Fig 2: Identifying Harness And Connector (IG1 Circuit)

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

   Standard Voltage

   Tester Display	Condition	Specified Condition
   L3-8 (IG1) - L2-8 (PGND)	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

4. Reconnect the seat belt control ECU connector.

NG → See step   4 

OK: Go to next step 

1. Disconnect the seat belt control ECU connector.
   Fig 3: Identifying Seat Belt Control ECU Connector Terminals

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

   Standard Voltage

   Tester Display	Condition	Specified Condition
   L2-7 (+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   8 

1. Remove the instrument panel junction block assembly.
   Fig 4: Identifying Instrument Panel Junction Block Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1

   Instrument Panel Junction Block Assembly

   -

   -

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2E-1 - 2B-16	Always	10 kΩ or higher
   2E-1 - 2B-16	When battery voltage applied to terminals 2B-25 and 2B-6	Below 1 Ω

3. Reinstall the instrument panel junction block assembly.

NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

OK: Go to next step 

1. Disconnect the instrument panel junction block assembly connector.
   Fig 5: Identifying Seat Belt Control ECU And Instrument Panel Junction Block Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the seat belt control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2B-16 - L3-8 (IG1)	Always	Below 1 Ω
   2B-16 - Body ground	Always	10 kΩ or higher
   L3-8 (IG1) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Seat Belt Control ECU)
   *2	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

4. Reconnect the seat belt control ECU connector.
5. Reconnect the instrument panel junction block assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - SEAT BELT CONTROL ECU) 

OK: Go to next step 

1. Disconnect the instrument panel junction block assembly connector.
   Fig 6: Disconnecting The Instrument Panel Junction Block Assembly Connector

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2B-6 - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

3. Reconnect the instrument panel junction block assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BODY GROUND) 

OK: Go to next step 

1. Disconnect the instrument panel junction block assembly connector.
   Fig 7: Identifying Power Management Control ECU And Instrument Panel Junction Block Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the power management control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2B-25 - L6-2 (IG1D)	Always	Below 1 Ω
   2B-25 - Body ground	Always	10 kΩ or higher
   L6-2 (IG1D) - Body ground</ ptxt>	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Power Management control ECU)
   *2	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

4. Reconnect the power management control ECU connector.
5. Reconnect the instrument panel junction block assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - POWER MANAGEMENT ECU) 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BATTERY)