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No Bus Bias

WARNING: This page is about a different car, the 2002 Dodge Ram Wagon, 2002 Dodge Ram Van, 2001 Dodge Ram Wagon, and 2001 Dodge Ram Van. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Perform BODY VERIFICATION TEST  under VERIFICATION TESTS after each repair.

Possible Causes:

  1. Scan Tool Or Scan Tool Cable
  2. Junction Block Fuse No. 1 Open
  3. Open Fused B+ Circuit
  4. MIC Ground Circuit Open
  5. CCD Bus (+) Open To MIC
  6. CCD Bus (-) To MIC
  7. MIC

Testing

  1. Turn ignition off. Disconnect scan tool from DLC. Turn ignition on. Using a DVOM, measure voltage between ground and terminals No. 3 (Violet/Brown wire) and No. 11 (White/Black wire). See Figure . If voltage is 1.8-2.8 volts, replace scan tool or scan tool cable as necessary. If voltage is not 1.8-2.8 volts, go to next step.
  2. Remove and inspect fuse No. 1 (15-amp) in fuse block. Fuses are identified on fuse block cover. If fuse is open, repair short to ground in power distribution circuit as necessary. See POWER DISTRIBUTION in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If fuse is okay, go to next step.
  3. Turn ignition off. Install fuse No. 1. Remove Electro-Mechanical Instrument Cluster (EMIC). See ELECTRO-MECHANICAL INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Clean and repair connectors as necessary. Turn ignition on. Measure voltage between ground and EMIC connector C1 terminals No. 6 (Pink/White wire). See Figure . If battery voltage is not present, repair open in Pink/White wire. If battery voltage is present, go to next step.
  4. Turn ignition off. Measure resistance between ground and EMIC connector C1 terminal No. 4 (Black/Dark Green wire). Measure resistance between ground and EMIC connector C2 terminal No. 7 (Black wire). If resistance is more than 5 ohms on either wire, repair open or high resistance in appropriate wire between EMIC and ground. If resistance is less than 5 ohms on both wires, go to next step.
  5. Using a DVOM, measure resistance between ground and EMIC connector C1 terminal No. 9 (White/Black wire). Measure resistance between ground and terminal No. 10 (Violet/Brown wire) at EMIC connector C1. If resistance is less than 700 ohms on either wire, repair short to ground in appropriate wire between EMIC and DLC. If resistance is more than 700 ohms on both wires, go to next step.
  6. Using a DVOM, measure resistance of Violet/Brown wire between EMIC connector C1 terminal No. 10 and DLC terminal No. 3. See Figure and Figure . If resistance is more than 5 ohms, repair open in Violet/Brown wire. If resistance is less than 5 ohms, go to next step.
  7. Measure resistance of White/Black wire between EMIC connector C1 terminal No. 9 and DLC terminal No. 11. If resistance is less than 5 ohms, replace EMIC. If resistance is more than 5 ohms, repair open in White/Black wire.
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