IG Power Source Circuit

DESCRIPTION

When the ignition switch is turned to the ON position, the IG power source circuit supplies positive voltage to the multiplex tilt & telescopic ECU.
The multiplex tilt & telescopic ECU also receives ignition switch signals via this circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. INSPECT FUSE (ECU-IG NO.1 FUSE)

1. Remove the ECU-IG No.1 fuse from the driver side J/B.

2. Check the continuity of the ECU-IG No.1 fuse.

   OK:

   There is continuity.
   

NG	REPLACE FUSE

OK

2. CHECK HARNESS AND CONNECTOR (BETWEEN MULTIPLEX TILT & TELESCOPIC ECU AND BATTERY)

1. Disconnect the T4 connector from the multiplex tilt & telescopic ECU.

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

   Voltage:

   Tester connection (Terminal No.)	Condition	Specified value
   IG (T4-8) - Body ground	Ignition switch on	10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3. CHECK HARNESS AND CONNECTOR (BETWEEN MULTIPLEX TILT & TELESCOPIC ECU AND BODY GROUND)

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

   Resistance:

   Tester connection (Terminal No.)	Condition	Specified value
   GND (T4-11) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE