Inspection Procedure

1. Remove the AM1 fuse and MPX-IG fuse from the driver side J/B.
2. Remove the MPX-B3 fuse from the passenger side J/B.
3. Measure the resistance of the fuse.
   1. Standard: Below 1 Ω 

NG: REPLACE FUSE 

OK: Go to next step 

1. Disconnect the DA, DE, DF and DG J/B connectors.
2. Disconnect the D5 ECU connector.
3. Measure the voltage and resistance of the wire harness side connectors.
   Fig 1: Driver Side J/B And Driver Side J/B ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TESTER CONNECTION CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   DA-1 (MPX-IG) - Body ground	Always	10 to 14V
   D5-5 (MPX-B) - Body ground	Always	10 to 14V
   DG-8 (GND) - Body ground	Always	Below 1 Ω
   D5-1 (GND2) - Body ground	Always	Below 1 Ω
   DE-17 (MPX-IG) -DF-4 (GND)	Ignition switch OFF --> ON	10 kΩ or higher --> Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

1. Remove the D-IG1 relay from the driver side J/B.
2. Measure the resistance of the relay.
   Fig 2: Identifying D-IG1 Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TESTER CONNECTION CONDITION CHART
   
   

   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: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE  )