Power Source Circuit: Procedure

1. Remove the ECU-IG No. 1 fuse from the instrument panel junction block.
2. Remove the ECU-B fuse from the engine room relay block and junction block.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

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

NG → REPLACE FUSE 

OK: Go to next step 

1. Disconnect the E42 daytime running light relay connector.
   Fig 1: Checking E42 Daytime Running Light Relay Connector Terminals

   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
   E42-1 (+B) - Body ground	Always	11 to 14 V
   E42-12 (IG) - Body ground	Ignition switch ON	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 2: Checking E42 Daytime Running Light Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E42-11 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4