Inspection Procedure

Check voltage between terminal IG of body ECU connector and body ground.
PREPARATION:
1. Remove the instrument panel (See REMOVAL ).
2. Turn the ignition switch ON.
  
  Fig 1: Checking Voltage Between Terminal IG Of Body ECU Connector And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK:

Measure the voltage between terminal IG of the body ECU connector and body ground.

OK:

Voltage: 9 - 14 V

OK: Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE ).

NG: Go to next step.
Check AM1 and GAUGE fuses.
PREPARATION:

Remove the AM1 and GAUGE fuses from the R/B No. 3.

CHECK:

Check the continuity of the AM1 and GAUGE fuses.

OK: Continuity

Fig 2: Identifying AM1 And Gauge Fuses
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Check for short in all harness and components connected to faulty fuse.

OK: Go to next step.
Check ignition relay (Marking: IG1) (See INSPECTION ).
NG: Replace ignition relay.

OK: Go to next step.
Check ignition switch (See INSPECTION ).
NG: Replace ignition switch.

OK: Go to next step.
Check harness and connector between body ECU and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
NG: Repair or replace harness or connector.

OK: Check and repair harness and connector between body ECU and battery (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).