LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2000 >> Wrangler SE, Standard >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Modules >> System Tests >> Communications >> Bus Bias Too High/Too Low
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Bus Bias Too High/Too Low

  1. Disconnect scan tool from Data Link Connector (DLC). Using an external voltmeter, measure voltage between ground and terminal No. 3 (Violet/Brown wire) on DLC. If voltage is not 2.3-2.6 volts, go to step  3 . If voltage is 2.3-2.6 volts, go to next step.
  2. Measure voltage between ground and terminal No. 11 (White/Black wire) on DLC connector. If voltage is not 2.3-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace scan tool cable or scan tool.
  3. Connect scan tool to DLC. Turn ignition off. Disconnect Powertrain Control Module (PCM). Turn ignition on. Using scan tool, perform CCD BUS test under SYSTEM MONITORS. If scan tool displays BUS OPERATIONAL, replace PCM. If scan tool does not display BUS OPERATIONAL, go to next step.
  4. Turn ignition off. Disconnect Smart Key Immobilizer Module (SKIM). Turn ignition on. If scan tool displays BUS OPERATIONAL, replace SKIM. If scan tool does not display BUS OPERATIONAL, go to next step.
  5. Turn ignition off and wait 2 minutes. Disconnect Air Bag Control Module (ACM). Turn ignition on. If scan tool does displays BUS OPERATIONAL, diagnose ACM. See AIR BAG RESTRAINT SYSTEMS article. If scan tool does not display BUS OPERATIONAL, go to next step.
  6. Turn ignition off. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Ensure interior lights are off. Using external ohmmeter, measure resistance between ground and terminal No. 6 (Black/Light Green wire) on instrument cluster Blue harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open Black/Light Green wire.
  7. Ensure PCM, SKIM and ACM connectors are disconnected. Connect jumper wire between ground and terminal No. 11 (White/Black wire) on DLC connector. Using external ohmmeter, measure resistance between ground and terminal No. 1 (White/Black wire) on instrument cluster Green connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open White/Black wire.
  8. Disconnect jumper wire. Measure resistance between ground and terminal No. 1 (White/Black wire) on instrument cluster Green connector. If resistance is less than 1000 ohms, repair White/Black wire for short to ground. If resistance is 1000 ohms or greater, go to next step.
  9. Connect jumper wire between ground and terminal No. 3 (Violet/Brown wire) on DLC connector. Using external ohmmeter, measure resistance between ground and terminal No. 2 (Violet/Brown wire) on instrument cluster Green connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open Violet/Brown wire.
  10. Disconnect jumper wire. Measure resistance between ground and terminal No. 2 (Violet/Brown wire) on instrument cluster Green connector. If resistance is less than 1000 ohms, repair Violet/Brown wire for short to ground. If resistance is 1000 ohms or greater, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION.
scientia non olet · About LEMON Manuals