Inspection Procedure

1. Remove the ECU-B fuse from the engine room relay block.
2. Remove the ECU-IG No. 1 fuse from the main body ECU.
3. Measure the resistance.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   ECU-B fuse	Always	Below 1 Ω
   ECU-IG No. 1 fuse	Always	Below 1 Ω

4. Reinstall the fuses.

NG : REPLACE FUSE 

Fig 1: Identifying ECU-B Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Remove the POWER fuse from the main body ECU.
2. Turn the ignition switch ON.
3. Measure the voltage between the POWER fuse terminal of the main body ECU and body ground.

   Standard voltage 

   TERMINALS VOLTAGE REFERENCE
   
   

   Tester Connections	Condition	Specified Conditions
   POWER fuse terminal (1) - Body ground	Ignition switch ON	11 to 14 V

4. Reinstall the POWER fuse.

NG : REPLACE MAIN BODY ECU (PWR RELAY) 

Fig 2: Identifying Power Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Disconnect the E4 power window regulator master switch assembly connector.
2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   E4-6 (B) - Body ground	Ignition switch ON	11 to 14 V

3. Measure the resistance of the wire harness side connector.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   E4-1 (E) - Body ground	Always	Below 1 Ω

4. Reconnect the G1 power window regulator master switch assembly connector.
   Fig 3: Identifying E4 Power Window Regulator Master Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY  (See REMOVAL  )