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Test 20A - Repairing CMTC No Response

CAUTION: Always turn ignition off prior to disconnecting or connecting any module connector.
NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  in this article. For appropriate wiring diagram, see WIRING DIAGRAMS  section at the end of this article. Perform TEST VER-1B  after each repair.
  1. Turn ignition off. Gain access to Compass/Mini-Trip Computer (CMTC) module connector, located behind overhead console. Disconnect CMTC module connector. Check condition of connector, and clean or repair connector as necessary. If connector is okay, go to next step.
  2. Using scan tool in ohmmeter mode, check resistance of CMTC module connector terminal No. 5 (Black/Light Green wire). If resistance is more than 5 ohms, repair open Black/Light Green wire. If resistance is less than 5 ohms, go to next step.
  3. Turn ignition on, engine off. Using scan tool in voltmeter mode, check voltage on CMTC module connector terminal No. 7 (Dark Green/White wire). If voltage is less than 10 volts, go to step 6). If voltage is more than 10 volts, go to next step.
  4. Connect a jumper wire from chassis ground to CMTC module connector terminal No. 11 (White/Black wire). 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, go to next step.
  5. Disconnect jumper wire. Connect jumper wire between chassis ground and CMTC module connector terminal No. 12 (Violet/Brown wire). If scan tool does not display BUS SHORTED TO GROUND, repair open Violet/Brown wire. If scan tool displays BUS SHORTED TO GROUND, replace CMTC module.
  6. Remove and inspect fuse No. 7 from fuse block. If fuse is okay, go to step 8). If fuse is open, go to next step.
  7. Using scan tool in voltmeter mode, check voltage on fuse No. 7 connector ignition switch output circuit (Black/White wire). If voltage is less than 10 volts, repair open Black/White wire between fuse No. 7 connector and ignition switch. If voltage is more than 10 volts, repair open Dark Green/White wire between fuse No. 7 connector and CMTC module connector.
  8. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of fuse No. 7 (Dark Green/White wire). If resistance is less than 5 ohms, repair short to ground in Dark Green/White wire. If resistance is more than 5 ohms, replace fuse No. 7.
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