IG Power Source Circuit: Procedure

1. Remove the ECU-IG1 No. 1 fuse from the main body ECU.
2. Measure the resistance of the fuse.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   ECU-IG1 No. 1 fuse	Always	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Disconnect the E27 connector from the multiplex tilt and telescopic ECU.
   Fig 1: Identifying E27 Connector

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   E27-8 (IG) - E27-11 (GND)	Engine switch on (IG)	11 to 14 V

NG → See step   3 

OK → See step   5 

1. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying Multiplex Tilt And Telescopic ECU E27 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E27-11 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 3: Identifying Main Body ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   2D-56 - Body ground	Engine switch on (IG)	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - BATTERY) 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - MAIN BODY ECU)