Symptom Id Test 1A - Identifying Vehicle Equipment & System Problems

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

Connect scan tool to Data Link Connector (DLC). DLC is located under instrument cluster, right of steering column. If scan tool screen is blank, go to TEST 115A . If scan tool is not blank, go to next step.
Turn ignition on. Using scan tool, select Body System. If scan tool does not display BUS OPERATIONAL, see VEHICLE COMMUNICATIONS TESTS . If scan tool displays BUS OPERATIONAL, go to next step.
Select BODY COMPUTER. If scan tool does not display BUS OPERATIONAL, see VEHICLE COMMUNICATIONS TESTS . If scan tool displays BUS OPERATIONAL, go to next step.
If scan tool displays TURN IGNITION ON, go to TEST 112A . If scan tool does not display TURN IGNITION ON, go to next step.
If scan tool displays NO RESPONSE, go to TEST 113A . If scan tool does not display NO RESPONSE, go to next step.
Using scan tool, select INPUT/OUTPUT and read IGN RUN/START status. If scan tool displays OPEN, go to TEST 112A . If scan tool does not display OPEN, go to next step.
Using scan tool, select READ DTCS. If any fault messages are displayed, go to SYMPTOM ID TEST 1B . If no fault messages are displayed, see SYSTEM DIAGNOSTIC TEST DIRECTORY table for specific system diagnosis. When diagnosing a vehicle with many apparent failures, start at top of table and perform indicated tests. Failures may occur separately or in various combinations. After repairs, ensure failure or group of failures have been corrected.

SYSTEM DIAGNOSTIC TEST DIRECTORY

Suspected System

Perform

Automatic Temperature Control

⁽¹⁾

Manual A/C System

⁽¹⁾

Chime System

Courtesy Lamp System

Headlight System

Illuminated Entry System

Electro/Mechanical Instrument Cluster

Key-In Lamp

Message Center

Overhead Travel Information System (OTIS)

Power Door Lock System

Power Door Lock System (With RKE)

Air Bag System

⁽²⁾

Vehicle Theft Security System

Windshield Wiper System

⁽¹⁾	TEST 2A through TEST 24A are related to Automatic Temperature Control (ATC) system. TEST 25A through TEST 28A are related to manual A/C-heater system. For automatic or manual A/C-heater system test procedures, see appropriate A/C-HEATER SYSTEM article in the AIR CONDITIONING & HEAT section.

⁽²⁾	TEST 116A is related to air bag system. For testing information, see AIR BAG RESTRAINT SYSTEM article in the ACCESSORIES/SAFETY EQUIPMENT section.