Inspection Procedure

Check voltage between terminal IG of body ECU connector and body ground.
PREPARATION:
1. Remove the Instrument Panel .
2. Turn the ignition switch ON.
CHECK:

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

Fig 1: Checking ECU Terminal For Voltage
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK = Voltage: 9 - 14 V
1. OK: Proceed to next circuit inspection shown in PROBLEM SYMPTOMS .
2. NG: Go to next step.
Check AM1 and GAUGE fuses.
PREPARATION:

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

Fig 2: Locating AM1 & GAUGE Fuses In Relay Block No. 3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK:

Check the continuity of the AM1 and GAUGE fuses.

OK = Continuity
1. OK: Go to next step.
2. NG: Check for short in all harness and components connected to faulty fuse.
Check ignition relay (Marking: IG1). See step 3 under INSPECTION .
1. OK: Go to next step.
2. NG: Replace ignition relay.
Check ignition switch. See INSPECTION .
1. OK: Go to next step.
2. NG: Replace ignition switch.
Check harness and connector between body ECU and body ground.
1. OK: Check and repair harness and connector between body ECU and battery.
2. NG: Repair or replace harness or connector.