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Test 82A - Blank Screen Or No Response Condition On OTIS

NOTE: For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER  section in this article. Perform TEST VER-1  VERIFICATION TEST after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Turn ignition off. Disconnect OTIS 4-pin connector. Using scan tool in ohmmeter mode, check resistance of OTIS 4-pin connector terminal No. 3 (Black/Light Green wire). If resistance is 5 ohms or greater, repair open Black/Light Green wire. If resistance is less than 5 ohms, go to next step.
  2. Turn ignition on. Using scan tool in voltmeter mode, check voltage on OTIS 4-pin connector terminal No. 4 (Dark Blue/White wire). If voltage is 10 volts or less, repair open Dark Blue/White wire. If voltage is more than 10 volts, go to next step.
  3. Connect jumper wire between OTIS 4-pin connector terminal No. 1 (White/Black wire) and chassis ground. Using scan tool, read CCD bus status. If scan tool does not display BUS SHORTED TO GROUND, repair open White/Black wire. If scan tool displays BUS SHORTED TO GROUND, disconnect jumper wire. Go to next step.
  4. Connect jumper wire between OTIS 4-pin connector terminal No. 2 (Violet/Brown wire) and chassis ground. If scan tool does not display BUS SHORTED TO GROUND, repair open Violet/Brown wire. If scan tool displays BUS SHORTED TO GROUND, replace OTIS module.
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