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Test 56A - All Gauges Inoperative

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. Remove and inspect fuse No. 17. See Figure . If fuse is open, go to TEST 56B. If fuse is okay, reinstall fuse. Go to next step.
  2. Turn ignition on. Using scan tool in voltmeter mode, check voltage on fuse No. 17 (Red/White wire). If voltage is 10 volts or less, go to step 7). If voltage is more than 10 volts, go to next step.
  3. Turn ignition off. Disconnect instrument cluster Black connector. Turn ignition on. Check voltage on instrument cluster Black connector terminal No. 6 (Red/White wire). If voltage is 10 volts or less, repair open Red/White wire. If voltage is more than 10 volts, go to next step.
  4. Connect a jumper wire between instrument cluster Black connector terminal No. 3 (Violet/Brown wire) and chassis ground. Using scan tool, perform CCD bus test. If scan tool does not display BUS SHORTED TO GROUND, repair open Violet/Brown wire between Body Control Module (BCM) and instrument cluster. If scan tool displays BUS SHORTED TO GROUND, go to next step.
  5. Connect a jumper wire between instrument cluster Black connector terminal No. 2 (White/Black wire) and chassis ground. Using scan tool, perform CCD bus test. If scan tool does not display BUS SHORTED TO GROUND, repair open White/Black wire between BCM and instrument cluster. If scan tool displays BUS SHORTED TO GROUND, go to next step.
  6. Close all doors. Turn ignition off and remove key. Wait 30 seconds. Using scan tool in ohmmeter mode, check resistance of instrument cluster Black connector terminal No. 1 (Black/Light Green wire). If resistance is 100 ohms or greater, repair open Black/Light Green wire. If resistance is less than 100 ohms, replace instrument cluster.
  7. Turn ignition off. Disconnect ignition switch connector. See Figure . Turn ignition on. Using scan tool in voltmeter mode, check voltage on ignition switch connector terminal No. 9 (Red wire). If voltage is 10 volts or less, repair open Red wire. If voltage is more than 10 volts, go to next step.
  8. Turn ignition off. Using an external ohmmeter, check resistance of Red/White wire between ignition switch connector terminal No. 8 and fuse No. 17. If resistance is 5 ohms or greater, repair open Red/White wire. If resistance is less than 5 ohms, replace ignition switch.
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