LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 1998 >> Grand Cherokee 5.9 Limited >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Computer >> System Testing >> Vehicle Communications >> Test 14A - Bus Short To 5 Volts
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test 14A - Bus Short To 5 Volts

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM). PCM is located at right corner of firewall. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, go to TEST 14B. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  2. Turn ignition off. Disconnect Compass/Mini-Trip Computer (CMTC) module. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace CMTC. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  3. Turn ignition off. Disconnect Automatic Temperature Control (ATC) head connector. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, go to TEST 14C. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  4. Turn ignition off. Disconnect instrument cluster. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace instrument cluster circuit board. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  5. Turn ignition off. Disconnect Vehicle Information Center (VIC). Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace VIC. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  6. Turn ignition off. Disconnect CCD radio. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace radio. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  7. Turn ignition off. Disconnect memory seat module. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, go to TEST 14D. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  8. Turn ignition off. Disconnect driver door module. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace driver door module. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  9. Turn ignition off. Disconnect passenger seat module. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace passenger door module. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  10. Turn ignition off. Disconnect Body Control Module (BCM) connectors. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, go to TEST 14E. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  11. Turn ignition off and wait 5 minutes. Disconnect Air Bag System Control Module (ABSCM). ABSCM is located under center console. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace ABSCM. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  12. Disconnect scan tool from DLC. Using external voltmeter, measure voltage at terminal No. 19 (Violet/Brown wire) on BCM Black connector. If voltage is more than 4 volts, repair Violet/Brown wire for short to 5-volt supply voltage. If voltage is 4 volts or less, go to next step.
  13. Measure voltage at terminal No. 20 (White/Black wire) on BCM Black connector. If voltage is more than 4 volts, repair White/Dark Green wire for short to 5-volt supply voltage. If voltage is less than 4 volts, replace scan tool cable or scan tool as necessary.
NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION  . For wiring diagrams, refer to WIRING DIAGRAMS  . After each repair, perform TEST VER-1A  .
CAUTION: Always turn ignition off prior to disconnecting any module connector.
scientia non olet · About LEMON Manuals