Inspection Procedure

1. Remove the MPX-IG and AM1 fuses from the driver side junction block.
2. Remove the MPX-B1 fuse from the passenger side junction block.
3. Remove the D-DOOR and D/C CUT fuses from the engine room No. 1 relay block.
4. Measure the resistance of the fuses.

   Standard resistance: Below 1 Ω 

NG: REPLACE FUSE 

OK: Go to Next Step 

1. Remove the IG1 relay from the driver side junction block.
2. Measure the resistance of the relay.
   Fig 1: Identifying Resistance Of Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

NG: REPLACE RELAY 

OK: Go to Next Step 

1. Disconnect the D19 ECU connector.
   Fig 2: Identifying D19 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance and voltage of the wire harness side connector.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   D19-1 (GND) - Body ground	Always	Below 1 Ω

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   D19-4 (CPUB) - Body ground	Always	10 to 14 V
   D19-6 (BDR) - Body ground	Always	10 to 14 V
   D19-5 (SIG) - Body ground	Ignition switch ON	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH