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Test 81A - Diagnosing Overhead Travel Information System (OTIS)

NOTE: Perform SYMPTOM ID TEST 1A  - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring schematics, see WIRING DIAGRAMS  in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE  after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Connect scan tool to Data Link Connector (DLC). DLC is located under instrument cluster, next to center console. If Overhead Travel Information System (OTIS) is blank or if scan tool displays NO RESPONSE, go to TEST 82A  . If OTIS screen is not blank and scan tool does not display NO RESPONSE, go to next step.
  2. Using scan tool, select OTIS AUTO SELF TEST. If any OTIS segment fails to illuminate, or OTIS screen displays FAIL or CCD, replace OTIS module. If OTIS segments illuminate, and OTIS screen does not display FAIL or CCD, go to next step.
  3. Rotate instrument cluster dimmer control to low. If OTIS does not respond to instrument cluster dimmer control, replace OTIS module. If OTIS responds to dimmer control, go to next step.
  4. Check if compass is inoperative or wrong. If compass is operating properly, go to step 6). If compass is inoperative or wrong, go to next step.
  5. Locate open area away from large metal objects. Turn ignition on. Press and hold compass/temperature button until CAL is displayed. Driving slowly, perform 3 complete circles. CAL lamp will turn off and compass will be calibrated.
  6. Determine problem with OTIS and perform appropriate test listed in DIAGNOSING OTIS table.
DIAGNOSING OTIS

Complaint Perform
Outside Temperature Display (1)
Average MPG Or Fuel Economy (2) TEST 85A 
Trip Odometer TEST 85A 
No Response From Switches TEST 86A 
Distance To Empty (2) TEST 67A 
Elapsed Time (3)
(1) If display stays at more than 120°F (49°C) or less than 40°F (4°C), perform TEST 83A  . If displayed reading is incorrect, perform TEST 84A  .
(2) Miles Per Gallon (MPG), instantaneous fuel economy and distance to empty displays are only accurate to plus or minus 5 percent.
(3) Replace Body Control Module (BCM).
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