System Operation Check

Trouble shooting of instrument panel system complaint begins with verification of the customer problem. If problem occurs, go to step 3. If problem does not occur, go to next step.
If problem does not occur, review conditions under which problem occurred for customer and try to duplicate those conditions. For example, if the problem occurs on rainy days or during high humidity conditions, sprinkle water onto vehicle and see if malfunction occurs. DO NOT sprinkle water directly into engine compartment or onto electronic components. Visually inspect for signs of mechanical and electrical damage. Inspect for blown fuses and damaged relays. Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary. If problem still cannot be created, go to next step.
Inspect the multiplex communication system. See MULTIPLEX COMMUNICATION SYSTEM article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.

Determine the problem symptom. See PROBLEM SYMPTOM INDEX table.

PROBLEM SYMPTOM INDEX

Symptom

Suspected Area ⁽¹⁾

Gauges

Speedometer Does Not Operate Or Operates Abnormally

⁽²⁾⁽³⁾

Tachometer Does Not Operate Or Operates Abnormally

⁽⁴⁾⁽⁵⁾

Fuel Gauge Does Not Operate Or Operates Abnormally

⁽⁶⁾⁽⁷⁾⁽⁸⁾⁽⁹⁾⁽¹⁰⁾

Engine Coolant Temperature Gauge Does Not Operate

⁽¹¹⁾⁽¹²⁾⁽⁸⁾⁽⁹⁾⁽¹³⁾

Indicator Lights & Warning Lights

Shift Indicator Light Does Not Light Up

⁽¹⁴⁾⁽¹⁵⁾⁽¹⁶⁾⁽¹³⁾

Open Door Warning Light Does Not Light Up

⁽¹⁴⁾⁽¹⁷⁾⁽¹⁰⁾

Driver Seat Belt Warning Light Does Not Light Up

⁽¹⁴⁾⁽¹⁸⁾⁽¹⁹⁾⁽⁸⁾⁽¹⁰⁾

Passenger Seat Belt Warning Light Does Not Light Up (In A/C Control Panel)

⁽²⁰⁾⁽²¹⁾⁽²²⁾⁽⁸⁾⁽²³⁾

Low Oil Pressure Warning Light Does Not Light Up

⁽¹⁴⁾⁽²⁴⁾⁽¹³⁾

Discharge Warning Light Does Not Light Up

⁽¹⁴⁾⁽²⁵⁾⁽¹³⁾

Brake Warning Light Does Not Light Up

⁽¹⁴⁾⁽²⁶⁾⁽²⁷⁾⁽⁹⁾⁽²⁸⁾

CRUISE MAIN Indicator Light Does Not Light Up

⁽¹⁴⁾⁽²⁹⁾⁽⁹⁾⁽²³⁾⁽¹³⁾

ECT SNOW Indicator Light Does Not Light Up

⁽¹⁴⁾⁽³⁰⁾⁽⁹⁾⁽²³⁾⁽¹³⁾

ECT PWR Indicator Light Does Not Light Up

⁽¹⁴⁾⁽³⁰⁾⁽⁹⁾⁽¹³⁾

Engine Oil Level Warning Light Does Not Light Up

⁽¹⁴⁾⁽³¹⁾⁽⁹⁾

SRS Warning Light Does Not Light Up

⁽³²⁾⁽³³⁾⁽¹⁹⁾⁽⁸⁾⁽³⁴⁾

Hi-Beam Indicator Light Does Not Light Up

⁽³³⁾⁽¹⁹⁾⁽⁸⁾⁽³⁵⁾

Turn Indicator Light Does Not Light Up

⁽³³⁾⁽¹⁹⁾⁽⁸⁾⁽³⁶⁾

ABS Or TRAC Warning Light Does Not Light Up

⁽³⁷⁾⁽¹⁴⁾⁽¹⁹⁾⁽⁸⁾⁽²⁸⁾

Check Engine Warning Light Does Not Light Up

⁽³³⁾⁽¹⁹⁾⁽⁸⁾⁽¹³⁾

Fuel Level Warning Light Does Not Light Up

⁽³³⁾⁽³⁸⁾⁽¹⁹⁾⁽⁸⁾

Any Of Indicator Lights Do Not Light Up

⁽¹⁴⁾⁽³⁹⁾⁽⁹⁾

⁽¹⁾	Perform test procedures in order listed under suspected area.

⁽²⁾	Check the speedometer. See SPEEDOMETER CIRCUIT under CIRCUIT TESTS.

⁽³⁾	Check the speed sensor circuit. See SPEED SENSOR CIRCUIT under CIRCUIT TESTS.

⁽⁴⁾	Check the tachometer. See TACHOMETER CIRCUIT under CIRCUIT TESTS.

⁽⁵⁾	Check the igniter signal circuit. See IGNITER SIGNAL CIRCUIT under CIRCUIT TESTS.

⁽⁶⁾	Check the fuel receiver gauge. See FUEL GAUGE CIRCUIT under CIRCUIT TESTS.

⁽⁷⁾	Check the fuel sender gauge. See FUEL SENDER GAUGE under COMPONENT TESTS.

⁽⁸⁾	Check the wiring harness.

⁽⁹⁾	Check the combination meter. See COMBINATION METER CIRCUIT under CIRCUIT TESTS.

⁽¹⁰⁾	Check the body ECU. See BODY CONTROL SYSTEM article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.

⁽¹¹⁾	Check the engine coolant temperature receiver gauge. See ENGINE COOLANT TEMPERATURE GAUGE CIRCUIT under CIRCUIT TESTS.

⁽¹²⁾	Check the engine coolant temperature sender gauge. See ENGINE COOLANT TEMPERATURE GAUGE CIRCUIT under CIRCUIT TESTS.

⁽¹³⁾	Check the engine control module (ECM). See COMPUTERIZED ENGINE CONTROLS under SYSTEM & COMPONENT TESTING - GS300, GS430, IS300 & LS430 article in ENGINE PERFORMANCE.

⁽¹⁴⁾	Check the bulb circuit. See BULB CIRCUIT under CIRCUIT TESTS.

⁽¹⁵⁾	Check the park/neutral position switch. See DTC P1780: PARK/NEUTRAL POSITION SWITCH under DIAGNOSTIC TESTS under DIAGNOSIS - A-650E article under AUTOMATIC TRANSMISSION in TRANSAXLE/TRANSMSSION.

⁽¹⁶⁾	Check the transmission control switch. See DTC P1780: PARK/NEUTRAL POSITION SWITCH under DIAGNOSTIC TESTS under DIAGNOSIS - A-650E article under AUTOMATIC TRANSMISSION in TRANSAXLE/TRANSMSSION.

⁽¹⁷⁾	Check the door courtesy switch. See DOOR COURTESY SWITCH CIRCUIT under CIRCUIT TESTS under BODY CONTROL SYSTEM article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.

⁽¹⁸⁾	Check the driver buckle switch circuit. See SEAT BELT BUCKLE SWITCH CIRCUIT under CIRCUIT TESTS.

⁽¹⁹⁾	Check the meter circuit plate. See COMBINATION METER CIRCUIT under CIRCUIT TESTS.

⁽²⁰⁾	Check the passenger buckle switch circuit. See SEAT BELT BUCKLE SWITCH CIRCUIT under CIRCUIT TESTS.

⁽²¹⁾	Check the occupant detection sensor. See SEAT BELT WARNING OCCUPANT DETECTION SENSOR (PASSENGER SEAT ONLY) under COMPONENT TESTS.

⁽²²⁾	Check the A/C control panel. See AUTOMATIC A/C-HEATER SYSTEMS - IS 300 article in HVAC.

⁽²³⁾	Check the A/C ECU. See AUTOMATIC A/C-HEATER SYSTEMS - IS 300 article in HVAC.

⁽²⁴⁾	Check the low oil pressure warning switch. See LOW OIL PRESSURE WARNING SWITCH under COMPONENT TESTS.

⁽²⁵⁾	Check the generator. See GENERATORS & REGULATORS article under CHARGING SYSTEM in ELECTRICAL.

⁽²⁶⁾	Check the parking brake switch. See PARKING BRAKE SWITCH under COMPONENT TESTS.

⁽²⁷⁾	Check the brake fluid level warning switch. See BRAKE FLUID LEVEL WARNING SWITCH under COMPONENT TESTS.

⁽²⁸⁾	Check the anti-lock brake system (ABS) ECU. See ANTI-LOCK - IS300 article in BRAKES.

⁽²⁹⁾	Check the cruise control switch circuit. See CRUISE CONTROL article in ACCESSORIES & EQUIPMENT.

⁽³⁰⁾	Check the ECT pattern indicator signal. See DIAGNOSIS - A-650E article under AUTOMATIC TRANSMISSION in TRANSAXLE/TRANSMSSION.

⁽³¹⁾	Check the engine oil level warning sensor. See ENGINE OIL LEVEL WARNING SENSOR under COMPONENT TESTS.

⁽³²⁾	Check the MPX-B fuse then the SRS-B fuse.

⁽³³⁾	Check the bulb.

⁽³⁴⁾	Check the air bag assembly. See AIR BAG RESTRAINT SYSTEMS article.

⁽³⁵⁾	Check the headlight system. See AUTOMATIC HEADLIGHTS & LIGHTING SYSTEMS article under HEADLIGHTS in ACCESSORIES & EQUIPMENT.

⁽³⁶⁾	Check the turn signal and hazard warning system. See STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT.

⁽³⁷⁾	Check the GAUGE fuse.

⁽³⁸⁾	Check the fuel level warning switch. See FUEL RECEIVER GAUGE under COMPONENT TESTS.

⁽³⁹⁾	Check the combination meter ECU power source circuit. See COMBINATION METER ECU POWER SOURCE CIRCUIT under CIRCUIT TESTS.

Inspect the combination meter circuits. See CIRCUIT TESTS .
After repairs have been completed, confirm that problem has been eliminated. Operate the system under same conditions recorded for original complaint. If problem is no longer present, repair has corrected problem. If problem is still present, further diagnosis and repair is required.