Toyota Tundra Service Manual: IG Power Source Circuit

DESCRIPTION

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

The multiplex tilt and telescopic ECU also receives ignition switch signals via this circuit.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

(a) Disconnect the J174 multiplex tilt and telescopic ECU connector.

*a Front view of wire harness connector (to Multiplex Tilt and Telescopic ECU)

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

Standard Voltage:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Disconnect the J174 multiplex tilt and telescopic ECU connector.

*a Front view of wire harness connector (to Multiplex Tilt and Telescopic ECU)

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

Standard Resistance:

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR