Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.

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.