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No Bus Bias

CAUTION: Always turn ignition switch to OFF position prior to disconnecting any module connector or battery.
  1. Turn ignition switch to OFF position. Disconnect scan tool. Turn ignition switch to ON position. Using DVOM, measure voltage between ground and Data Link Connector (DLC) terminal No. 3 (Violet/Brown wire). Measure voltage between ground and DLC terminal No. 11 (White/Black wire). If either reading is not 1.8-2.8 volts, go to next step. If both readings are 1.8-2.8 volts, replace scan tool cable or scan tool.
  2. Remove and inspect fuse No. 17 (15-amp) from Junction Block (JB). See COMPONENT LOCATIONS  . Ensure fuse is correct application for circuit and fuse is not blown. If fuse is incorrect for circuit or fuse is blown, replace fuse No. 17 (15-amp). Inspect Dark Blue/White wire in wiring harness between JB, Mechanical Instrument Cluster (MIC) and any other related components for cause of blown fuse. See POWER DISTRIBUTION article in WIRING DIAGRAMS. Perform BODY VERIFICATION TEST  . If fuse is not blown and correct application, go to next step.
  3. Turn ignition switch to OFF position. Remove MIC. Install any fuses previously removed. Measure voltage between ground and MIC connector C1 terminal No. 6 (Yellow/White wire on Dakota; Pink wire on Durango). If reading is 10 volts or less, locate and repair open in fused battery circuit. On Dakota, check for an open in Yellow/White wire between MIC and fuse "F" (20-amp) in Power Distribution Center (PDC). On Durango, check for an open in Pink wire between MIC and fuse No. 12 (15-amp) in JB. See POWER DISTRIBUTION article in WIRING DIAGRAMS. Perform BODY VERIFICATION TEST  . On all models, if reading is more than 10 volts, go to next step.
  4. Measure resistance between ground and MIC connector terminal No. 4 (Black/Light Green wire on Dakota: Black/Tan wire on Durango). Measure resistance between ground and MIC connector terminal No. 5 (Black wire). If all readings are 5 ohms or less, go to next step. If any reading is more than 5 ohms, repair open in failed ground circuit. Perform BODY VERIFICATION TEST  .
  5. Ensure all interior lighting is turned off. Measure resistance between ground and MIC connector C1 terminal No. 10 (Violet/Brown wire). Measure resistance between ground and MIC connector C1 terminal No. 9 (White/Black wire). If either reading is less than 700 ohms, repair short to ground in Violet/Brown wire or White/Black wire. Perform BODY VERIFICATION TEST  . If both readings are 700 ohms or more, go to next step.
  6. Measure resistance of Violet/Brown wire between MIC connector C1 terminal No. 10 and Data Link Connector (DLC) terminal No. 3. If reading is less than 5 ohms, go to next step. If reading is 5 ohms or more, repair open in Violet/Brown wire between MIC and DLC. Perform BODY VERIFICATION TEST  .
  7. Measure resistance of White/Black wire between MIC connector C1 terminal No. 9 and DLC terminal No. 16. If reading is less than 5 ohms, go to next step. If reading is 5 ohms or more, repair open in White/Black wire between MIC and DLC. Perform BODY VERIFICATION TEST  .
  8. Inspect all related connectors for good terminal contact and Repair connectors as necessary. If all connectors are okay, replace MIC. Perform BODY VERIFICATION TEST  .
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