Trouble Shooting

Verify customer complaint. Perform a visual inspection, checking for open fuses, disconnected or damaged wire harnesses and components. Ensure all fluid levels are correct. Repair or replace items as necessary and recheck.

Verify proper multiplex control system operation and ensure no Diagnostic Trouble Codes (DTC) are present. See appropriate MULTIPLEX CONTROL SYSTEMS article. Repair as necessary. If no DTCs are present, diagnose by symptom. See appropriate SYMPTOM DIAGNOSIS table.

SYMPTOM DIAGNOSIS (GAUGES)

Symptom

Inspect

Speedometer Inoperative Or Abnormal Operation

⁽¹⁾ Speedometer Circuit
⁽¹⁾ Vehicle Speed Sensor (VSS) Circuit

Tachometer Inoperative Or Abnormal Operation

⁽¹⁾ Tachometer Circuit
⁽¹⁾ Igniter Signal Circuit

Fuel Gauge Inoperative Or Abnormal Operation

⁽¹⁾ Fuel Gauge Circuit
⁽²⁾ Fuel Gauge Sending Unit
⁽³⁾ Wire Harness
⁽⁴⁾ Instrument Cluster

Engine Coolant Temperature Gauge Inoperative Or Abnormal Operation

⁽¹⁾ Engine Coolant Temperature Gauge Circuit
⁽⁵⁾ Engine Coolant Temperature Sending Unit
⁽³⁾ Wire Harness
⁽⁴⁾ Instrument Cluster

⁽¹⁾	Perform appropriate circuit test under CIRCUIT TESTS . If more than one circuit test is listed, perform tests in order listed.

⁽²⁾	See FUEL GAUGE SENDING UNIT under COMPONENT TESTS.

⁽³⁾	Inspect wire harness and repair as necessary. See WIRING DIAGRAMS .

⁽⁴⁾	See INSTRUMENT CLUSTER under COMPONENT TESTS.

⁽⁵⁾	Inspect Engine Coolant Temperature Sensor. See SYSTEM & COMPONENT TESTING article in ENGINE PERFORMANCE. Repair as necessary.

SYMPTOM DIAGNOSIS (INDICATORS & WARNING LIGHTS)

Symptom

Inspect

Shift Indicator Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽²⁾ A/T Shift Indicator Light Switch
⁽²⁾ Transmission Control Switch

Open Door Warning Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽³⁾ Door Courtesy Switch

Driver's Seat Belt Warning Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽⁴⁾ Driver's Buckle Switch Circuit
⁽³⁾ Instrument Cluster
⁽⁵⁾ Wire Harness
⁽⁴⁾ Body Control ECU No. 2

Passenger's Seat Belt Warning Light Does Not Illuminate

⁽¹⁾ Clock Circuit
⁽⁴⁾ Passenger's Buckle Switch Circuit
⁽³⁾ Occupant Detection Sensor
⁽³⁾ Instrument Cluster
⁽⁵⁾ Wire Harness
⁽⁴⁾ Body Control ECU No. 1

Low Oil Pressure Warning Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽³⁾ Low Oil Pressure Warning Light Switch

Discharge Warning Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽⁶⁾ Generator

Brake Warning Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽³⁾ Parking Brake Switch
⁽³⁾ Brake Fluid Level Warning Switch
⁽³⁾ Instrument Cluster

Headlight Indicator Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽⁷⁾ Headlight & Taillight System
⁽³⁾Instrument Cluster

CRUISE MAIN Indicator Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽⁸⁾ Cruise Control Switch
⁽³⁾ Instrument Cluster

ECT SNOW Indicator Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽²⁾ ECT Pattern Indicator Signal
⁽³⁾ Instrument Cluster

ECT POWER Indicator Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽²⁾ ECT Pattern Indicator Signal
⁽³⁾ Instrument Cluster

VSC OFF Indicator Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽⁹⁾ ABS, TRAC & VSC ECU
⁽³⁾ Instrument Cluster

Washer Level Warning Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽³⁾ Window Washer Level Warning Switch
⁽³⁾ Instrument Cluster

Rear Lights Warning Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽¹⁾ Light Failure Sensor Circuit
⁽³⁾ Instrument Cluster

Engine Oil Level Warning Light Does Not Illuminate

⁽¹⁾ Bulb Circuit
⁽³⁾ Engine Oil Level Warning Sensor
⁽³⁾ Instrument Cluster

All Indicator & Warning Lights Do Not Illuminate

⁽¹⁾ Bulb Circuit
⁽¹⁾ Instrument Cluster ECU Power Source Circuit
⁽³⁾ Instrument Cluster

⁽¹⁾	Perform appropriate circuit test under CIRCUIT TESTS . If more than one circuit test is listed, perform tests in order listed.

⁽²⁾	See appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.

⁽³⁾	See appropriate test under COMPONENT TESTS .

⁽⁴⁾	See appropriate BODY CONTROL SYSTEMS article.

⁽⁵⁾	Inspect wiring harness and repair as necessary. See WIRING DIAGRAMS .

⁽⁶⁾	See GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.

⁽⁷⁾	See appropriate wiring diagram in EXTERIOR LIGHTS article.

⁽⁸⁾	See appropriate CRUISE CONTROL SYSTEMS article.

⁽⁹⁾	See appropriate ANTI-LOCK/TRACTION CONTROL SYSTEMS article in BRAKES.