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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 Battery

Bus Short To Battery

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 BATTERY, go to step  10 . If scan tool displays BUS SHORT TO BATTERY, go to next step.
  2. Turn ignition off. Disconnect instrument cluster. Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY, replace instrument cluster. If scan tool displays BUS SHORT TO BATTERY, go to next step.
  3. Turn ignition off. Disconnect compass mini-trip computer. Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY, replace compass mini-trip computer. If scan tool displays BUS SHORT TO BATTERY, go to next step.
  4. Turn ignition off. Disconnect CCD radio. Turn ignition on. If scan tool does not display BUS SHORT TO BATTERY, replace radio. If scan tool displays BUS SHORT TO BATTERY, go to next step.
  5. 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 BATTERY, replace ACM. If scan tool displays BUS SHORT TO BATTERY, go to next step.
  6. 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 BATTERY, replace CTM. If scan tool displays BUS SHORT TO BATTERY, go to next step.
  7. 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 BATTERY, replace anti-lock brake controller module. If scan tool displays BUS SHORT TO BATTERY, go to next step.
  8. Disconnect scan tool from DLC. Using external voltmeter, measure voltage between ground and DLC connector terminal No. 3 (Violet/Brown wire). If voltage is more than .2 volt, repair Violet/Brown wire for short to voltage. If voltage is .2 volt or less, go to next step.
  9. Measure voltage between ground and DLC connector terminal No. 11 (White/Black wire). If voltage is more than .2 volt, repair White/Black wire for short to voltage. If voltage is less than .2 volt, replace scan tool cable or scan tool as necessary.
  10. Turn ignition off. Using external ohmmeter, measure resistance between ground and Powertrain Control Module (PCM) connector C1 terminal No. 31 (Black/Tan wire). PCM is located at right inner fender, at corner of firewall. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, repair open Black/Tan wire.
  11. Measure resistance between ground and PCM connector C1 terminal No. 32 (Black/Tan wire). If resistance is less than 10 ohms, replace PCM. If resistance is 5 ohms or more, repair open Black/Tan wire.
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