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Short To Battery

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.
WARNING: Turn ignition off and wait 2 minutes before disconnecting Air Bag Control Module (ACM) connector, air bags are energized for up to 2 minutes after battery is disconnected and may deploy.
NOTE: Perform BODY VERIFICATION TEST  under VERIFICATION TESTS after each repair.

Possible Causes:

  1. ACM Short To Battery
  2. CAB Short To Battery
  3. CTM Ground Circuit Open
  4. CTM Internal Short To Battery
  5. Instrument Cluster Ground Circuit Open
  6. Instrument Cluster Internal Short To Battery
  7. PCM Ground Circuits
  8. PCM Internal Short To Battery
  9. Bus (+) Or Bus (-) Circuit Shorted To Voltage
  10. Scan Tool Or Scan Tool Cable

Testing

  1. Turn ignition off. Disconnect negative battery cable. Wait 2 minutes. Disconnect ACM connector. To disconnect ACM connector, remove Red Connector Position Assurance (CPA) lock from connector by sliding it toward front of vehicle. Depress connector latch tab and pull connector straight, away from ACM connector receptacle. Turn ignition on. Connect negative battery. If bus messages change after disconnecting ACM, replace ACM. See AIR BAG CONTROL MODULE  under REMOVAL & INSTALLATION. If bus messages do not change after disconnecting ACM, go to next step.
  2. Turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module connector. Turn ignition on. If bus messages change after disconnecting CAB module, replace CAB module. See CONTROLLER ANTI-LOCK BRAKE  under REMOVAL & INSTALLATION. If bus messages do not change after disconnecting CAB module, go to next step.
  3. If vehicle is not equipped with vehicle theft security system, go to step  6 . If vehicle is equipped with vehicle theft security system, go to next step.
  4. Turn ignition off. Disconnect Central Timer Module (CTM) connectors. Turn ignition on. If bus messages do not change after disconnecting CTM, go to step  6 . If bus messages change after disconnecting CTM, go to next step.
  5. Using a DVOM, measure resistance between ground and CTM connector C1 terminal No. 6 (Black/Tan wire). See Figure . Using a DVOM, measure resistance between ground and CTM connector C2 terminal No. 3 (Black wire). See Figure . If resistance is more than 5 ohms, repair open in Black/Tan wire or Black wire between CTM and ground. If resistance is 5 ohms or less, replace CTM.
  6. Turn ignition off. Remove Electro-Mechanical Instrument Cluster (EMIC). See ELECTRO-MECHANICAL INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect EMIC connectors. Turn ignition on. If bus messages do not change after disconnecting EMIC connectors, go to step  8 . If bus messages change after disconnecting EMIC connectors, go to next step.
  7. Turn ignition off. Using a DVOM, measure resistance between ground and EMIC connector C1 terminal No. 4 (Black/Dark Green wire). Using a DVOM, measure resistance between ground and EMIC connector C2 terminal No. 7 (Black wire). See Figure . If resistance is more than 5 ohms, repair open in appropriate wire between EMIC and ground. If resistance is less than 5 ohms, replace EMIC.
  8. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Turn ignition on. If scan tool does not display BUS OPERATIONAL after disconnecting PCM connectors, go to step  10 . If scan tool displays BUS OPERATIONAL after disconnecting PCM connectors, go to next step.
  9. Using a test light connected to positive battery voltage, probe PCM connector C1 terminals No. 31 and 32 (both Tan/Black wires). If test light does not illuminate brightly at each terminal, repair open in appropriate Tan/Black wire between PCM and ground. If test light illuminates brightly at each terminal, replace PCM.
  10. Ensure all modules connected to CCD bus are disconnected. See COMPUTER DATA LINES in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Using a DVOM, measure voltage between ground and DLC terminals No. 3 (Violet/Brown wire) and No. 11 (White/Black wire). See Figure . If voltage is more than .2 volt on either circuits, repair short to voltage in appropriate wire. If voltage is .2 volts or less, repair or replace scan tool cable or scan tool as necessary.
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