POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM - IG Power Source Circuit

DESCRIPTION

When the engine switch is turned on (IG), the IG power source circuit supplies positive voltage to the multiplex tilt & telescopic ECU.

The multiplex tilt & telescopic ECU also receives engine switch signals via this circuit.

Power Tilt And Power Telescopic Steering Column System - Ig Power Source Circuit. STEERING COLUMN. Lexus IS250 IS220d GSE20 ALE20

1.INSPECT FUSE (ECU-IG RH)

Remove the ECU-IG RH fuse from the main body ECU RH (cowl side J/B RH).

Measure the resistance of the ECU-IG RH fuse.

REPLACE FUSE

OK

2.INSPECT MULTIPLEX TILT & TELESCOPIC ECU (IG TERMINAL VOLTAGE)

Disconnect the J28 connector from the multiplex tilt & telescopic ECU.

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

Standard voltage:
Tester connection
(Terminal No.) Condition Specified value
IG (J28-8) - GND (J28-11) Engine switch on (IG) 10 to 14 V

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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

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

Standard resistance:
Tester connection
(Terminal No.) Condition Specified value
GND (J28-11) - Body ground Always Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - MAIN BODY ECU RH)

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

Standard voltage:
Tester condition Condition Specified value
RA-1 - Body ground Engine switch on (IG) 10 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (MULTIPLEX TILT & TELESCOPIC ECU - MAIN BODY ECU RH)

REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU RH (COWL SIDE J/B RH) - BATTERY)

Tester connection (Terminal No.)	Condition	Specified value
IG (J28-8) - GND (J28-11)	Engine switch on (IG)	10 to 14 V

Tester condition	Condition	Specified value
RA-1 - Body ground	Engine switch on (IG)	10 to 14 V