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Home >> Dodge and Ram >> 1992 >> Caravan Base, 2.5 K, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Body Control Computer >> Vehicle Communications Tests >> Test 17A - Bus (-) Open On Bus
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Test 17A - Bus (-) Open On Bus

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS .
  1. If DRB-II is not connected to correct diagnostic connector, connect DRB-II to CCD bus diagnostic connector. Perform VERIFICATION TEST . If DRB-II is connected to CCD bus diagnostic connector, turn ignition switch to OFF position. Disconnect body controller Blue connector. Body controller is located under left side of instrument panel. Check connector, and clean or repair connector as necessary.
  2. Using external ohmmeter, check resistance between terminals No. 7 and 20 at body controller. If resistance is not 100-140 ohms, replace body controller. Perform VERIFICATION TEST . If resistance is 100-140 ohms, check resistance at Violet/Brown wire between terminals No. 1 at CCD bus diagnostic connector and No. 7 at body controller Blue connector. If resistance is more than 5 ohms, repair open Violet/Brown wire and go to next step. If resistance is less than 5 ohms, go to next step.
  3. Check resistance of White/Black wire between terminals No. 6 at CCD bus diagnostic connector and No. 20 at body controller Blue connector. If resistance is more than 5 ohms, repair open White/Black wire. Perform VERIFICATION TEST . If resistance is less than 5 ohms, go to next step.
  4. Disconnect Single Board Engine Controller (SBEC) connector. Check connector condition and clean or repair connector as necessary. Using external ohmmeter, check resistance between terminals No. 26 and 46 at SBEC. If resistance is not 100-140 ohms, replace SBEC. Perform VERIFICATION TEST . If resistance is 100-140 ohms, go to next step.
  5. Check resistance at Violet/Brown wire between terminal No. 1 at CCD bus diagnostic connector and terminal No. 26 at SBEC connector. If resistance is more than 5 ohms, repair open Violet/Brown wire and go to next step. If resistance is less than 5 ohms, go to next step.
  6. Check resistance at White/Black wire between terminal No. 6 at CCD bus diagnostic connector and terminal No. 46 at SBEC connector. If resistance is more than 5 ohms, repair open White/Black wire. Perform VERIFICATION TEST . If resistance is less than 5 ohms, test DRB-II. Refer to TEST 5A .
  7. Replace DRB-II and/or adapter cable as necessary. Perform VERIFICATION TEST . If DRB-II and adapter cable are good, perform TEST 20A .
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