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Test 1A - Identifying Vehicle Equipment & System Problems

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  .
  1. Connect scan tool to Data Link Connector (DLC). DLC is located under instrument cluster, next to center console. If scan tool screen is blank, go to TEST 115A  . If scan tool is not blank, go to next step.
  2. Turn ignition on. Using scan tool, select Body System. If scan tool does not display BUS OPERATIONAL, see appropriate BODY CONTROL COMPUTER. If scan tool displays BUS OPERATIONAL, go to next step.
  3. Using scan tool, select Body Computer. If scan tool does not display BUS OPERATIONAL, see BODY CONTROL COMPUTER. If scan tool displays BUS OPERATIONAL, go to next step.
  4. If scan tool displays TURN IGNITION ON, go to TEST 112A  . If scan tool does not display TURN IGNITION ON, go to next step.
  5. If scan tool displays NO RESPONSE, go to TEST 113A  . If scan tool does not display NO RESPONSE, go to next step.
  6. Using scan tool, select Input/Output and read Ign Run/Start state. If scan tool displays OPEN, go to TEST 112A  . If scan tool does not display OPEN, go to next step.
  7. Using scan tool, read Diagnostic Trouble Codes (DTCs). If any DTCs are displayed, go to TEST 1B. If no DTCs are displayed, see DIAGNOSTIC TEST DIRECTORY table for specific diagnosis.
DIAGNOSTIC TEST DIRECTORY (1)

Problem/Message Perform Test No.
Automatic Temp. Control (ATC) System (2) TEST 2A
Manual A/C-Heater System (Non-ATC) (2) TEST 25A
Chime System TEST 29A
Courtesy Lamp System TEST 34A
Headlamp System (Including Ultralight) TEST 43A
Illuminated Entry System TEST 53A
Electro/Mechanical Instrument Cluster TEST 54A
Key-In Lamp TEST 75A
Message Center TEST 78A
Overhead Travel Information System (OTIS) TEST 81A
Power Door Lock System TEST 87A
Power Door Lock System (With RKE) TEST 95A
Windshield Wiper System TEST 103A
(1) 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.
(2) 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 the A/C-HEATER SYSTEM article.
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