Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2002 Chrysler Neon LE, AutomaticFACTORY OEM SERVICE PROCEDURE

Self-Diagnostic System

NOTE: Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box (DRBIII) scan tool. A generic scan tool may not be capable of performing all necessary test functions.

Perform pretest inspection. See PRETEST INSPECTION under TROUBLE SHOOTING. If pretest inspection procedure has been performed, go to next step.
Turn ignition off. Connect scan tool to Data Link Connector (DLC). DLC is located on bottom of instrument panel, to left of brake pedal. See Figure . Turn ignition on. Using scan tool, attempt to communicate with all modules. If communication is established with all modules, go to next step. If communication is not established with any module, perform appropriate test under COMMUNICATIONS under SYSTEM TESTS.

NOTE: Scan tool messages are listed by system affected and not by module retrieved from.

Using scan tool, retrieve Diagnostic Trouble Codes (DTC) from all modules. Do not clear DTCs until repairs are complete. If any DTCs exist, perform corresponding DTC tests under affected system under SYSTEM TESTS. If no DTCs exist, repair by corresponding symptom tests under affected system under SYSTEM TESTS . See SYMPTOM INDEX table.

SYMPTOM INDEX

Affected System

⁽¹⁾ Test

Communications

BUS +/- SIGNALS OPEN FROM COMPASS/TEMPERATURE MIRROR

.....

BUS +/- SIGNAL OPEN OR NO RESPONSE FROM INSTRUMENT CLUSTER

.....

BUS +/- SIGNALS OPEN OR NO RESPONSE FROM RKE

.....

BUS +/- SIGNAL OPEN OR NO RESPONSE FROM SKIM

.....

NO RESPONSE FROM ORC

.....

NO RESPONSE FROM CAB

.....

NO RESPONSE FROM LEFT SIACM

.....

NO RESPONSE FROM PCM (PCI BUS)

.....

NO RESPONSE FROM PCM (SCI ONLY)

.....

CHECKING PCM POWER & GROUND CIRCUITS

.....

NO RESPONSE FROM RADIO

.....

NO RESPONSE FROM RIGHT SIACM

.....

COMPLETE PCI BUS FAILURE

Exterior Lighting

HIGH BEAM HEADLIGHTS WILL NOT TURN ON

.....

HIGH BEAM HEADLIGHTS WILL NOT TURN OFF

.....

LOW BEAM HEADLIGHTS WILL NOT TURN OFF

.....

LOW BEAM HEADLIGHTS WILL NOT TURN ON

Instrument Cluster

ABS INDICATOR CIRCUIT OPEN

.....

ABS MESSAGE NOT RECEIVED

.....

.....

CLUSTER BUS TX SHUTDOWN

.....

.....

FUEL LEVEL SENSOR OPEN

.....

FUEL LEVEL SENSOR SHORT

.....

PANEL DIMMER OPEN

.....

ALL GAUGES INOPERATIVE

.....

ANY PCI BUS INDICATOR INOPERATIVE

.....

BRAKE WARNING INDICATOR ALWAYS ON

.....

BRAKE WARNING INDICATOR INOPERATIVE

.....

FOGLIGHT INDICATOR INOPERATIVE

.....

FUEL GAUGE INACCURATE

.....

HIGH BEAM INDICATOR INOPERATIVE

.....

CLUSTER ILLUMINATION INOPERATIVE

.....

LOW OIL PRESSURE INDICATOR ALWAYS ON

.....

LOW OIL PRESSURE INDICATOR INOPERATIVE

.....

ONE GAUGE INOPERATIVE

.....

PRND OR AUTOSTICK INDICATOR DISPLAY INACCURATE OR INOPERATIVE

.....

REAR FOG LAMP INDICATOR INOPERATIVE (BUX ONLY)

.....

SEAT BELT INDICATOR INOPERATIVE

.....

VF DISPLAY INOPERATIVE

Interior Lighting

ALL COURTESY LIGHTS INOPERATIVE

.....

COURTESY LIGHTS ON AT ALL TIMES

.....

ILLUMINATED ENTRY INOPERATIVE

Overhead Console

TEMPERATURE DISPLAY INOPERATIVE OR WRONG

.....

AMBIENT TEMPERATURE SENSOR CIRCUIT OPEN

.....

AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT

.....

COMPASS/TEMPERATURE MIRROR INTERNAL FAILURE

.....

COMPASS/TEMPERATURE MIRROR INOPERATIVE

Power Door Locks/Remote Keyless Entry

INCORRECT MODULE TYPE CONFIGURATION FOR PART NUMBER

.....

BODY STYLE MISMATCH

.....

DRIVER DOOR SWITCH SHORTED OR STUCK

.....

INTERIOR DECKLID RELEASE SWITCH SHORTED OR STUCK

.....

MODULE NOT CONFIGURED FOR RKE

.....

NO AIRBAG MESSAGES RECIEVED

.....

NO PCM MESSAGES RECIEVED

.....

NO SKIM MESSAGES RECIEVED

.....

PASSENGER DOOR SWITCH SHORTED OR STUCK (BUX)

.....

PASSENGER DOOR SWITCH SHORTED OR STUCK (NON BUX)

.....

ALL DOOR LOCKS INOPERATIVE

.....

ALL DOORS (EXCEPT DRIVER'S) FAIL TO LOCK & UNLOCK

.....

ALL DOORS (EXCEPT DRIVER'S) FAIL TO UNLOCK

.....

ALL DOORS FAIL TO LOCK

.....

ALL LOCKS INOPERATIVE FROM A LOCK SWITCH

.....

AUTOMATIC DOOR LOCK INOPERATIVE

.....

DECK LID SOLENOID INOPERATIVE

.....

DOORS LOCKABLE WITH KEY IN IGNITION & DRIVER'S DOOR OPEN

.....

DRIVER'S DOOR FAILS TO LOCK & UNLOCK

.....

DRIVER'S DOOR FAILS TO UNLOCK

.....

ONE PASSENGER'S DOOR FAILS TO LOCK & UNLOCK

.....

RKE TRANSMITTER INOPERATIVE

Vehicle Theft Security System (VTSS)

HEADLIGHTS FAIL TO FLASH DURING ALARM

.....

HORN FAILS TO SOUND DURING ALARM

.....

OPEN DRIVER'S DOOR FAILS TO TRIP ALARM

.....

OPEN PASSENGER'S DOOR FAILS TO TRIP ALARM

.....

PARKING LIGHTS FAIL TO FLASH DURING ALARM

.....

VTSS FAILS TO ARM/DISARM FROM DRIVER'S CYLINDER LOCK SWITCH

.....

VTSS FAILS TO ARM/DISARM FROM PASSENGER'S DOOR CYLINDER LOCK SWITCH

.....

VTSS INDICATOR FAILS TO FLASH

.....

VTSS INDICATOR STAYS ON STEADY DURING ARMING

⁽¹⁾	Perform corresponding test(s) under affected system under SYSTEM TESTS .

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

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