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Home >> Jeep >> 1998 >> Cherokee Classic, 2.5 P >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Vehicle Communications) >> Identifying Vehicle Communication Problems >> Bus Short To Ground

Bus Short To Ground

WARNING: This page is about a different car, the 1999 Dodge Pickup and 1999 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST VER-1  after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Turn ignition off. Disconnect Powertrain Control Module (PCM). PCM is mounted in right side of firewall. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace PCM. If scan tool displays BUS SHORT TO GROUND, go to next step.
  2. Turn ignition off. Disconnect anti-lock brake controller module. Controller module is mounted to top of ABS hydraulic unit. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace anti-lock brake controller module. If scan tool displays BUS SHORT TO GROUND, go to next step.
  3. Turn ignition off. Disconnect instrument cluster. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace instrument cluster circuit board. If scan tool displays BUS SHORT TO GROUND, go to next step.
  4. Turn ignition off. Disconnect compass mini-trip computer. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace compass mini-trip computer. If scan tool displays BUS SHORT TO GROUND, go to next step.
  5. Turn ignition off. Disconnect CCD radio. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace radio. If scan tool displays BUS SHORT TO GROUND, go to next step.
  6. Turn ignition off and wait 2 minutes. Disconnect Air Bag Control Module (ACM). ACM is located under center of instrument panel. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace ACM. If scan tool displays BUS SHORT TO GROUND, go to next step.
  7. Turn ignition off. Disconnect Central Timer Module (CTM). CTM is located under left side of instrument panel. Turn ignition on. If scan tool does not display BUS SHORT TO GROUND, replace CTM. If scan tool displays BUS SHORT TO GROUND, go to next step.
  8. Disconnect scan tool from DLC. Using external ohmmeter, measure resistance between ground and DLC connector terminal No. 3 (Violet/Brown wire). If resistance is less than 700 ohms, repair Violet/Brown wire for short to ground. If resistance is 700 ohms or more, go to next step.
  9. Measure resistance between ground and DLC connector terminal No. 11 (White/Black wire). If resistance is less than 700 ohms, repair White/Dark Green wire for short to ground. If resistance is 700 ohms or more, replace scan tool cable or scan tool as necessary.
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