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No Response From ACM

NOTE: After making any repairs, perform AIR BAG SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.

Possible Causes:

Testing

  1. Ensure battery is fully charged. Turn ignition off, disconnect battery and wait 2 minutes before proceeding. Disconnect air bag control module harness connector. Turn ignition on and then reconnect the battery. Using a 12-volt test light connected to ground, probe the fused ignition switch output run circuit and the fused ignition switch output run/start circuit at ACM connector. If the test light illuminates on both circuits, go to next step. If the test light does not illuminate on both circuits, repair the fused ignition switch output run and fused ignition switch output run/start circuits for an open. Replace the fuses if necessary.
  2. Using a 12-volt test light connected to 12 volts, probe the ground circuit at ACM connector. Ensure the test light is connected to the positive terminal. If the test light illuminates, go to next step. If the test light does not illuminate, repair the ground circuit for an open.
  3. Turn the ignition on and then reconnect the battery.
    4. NOTE: Steps  4 - 6 are written specifically for use with Chrysler's Diagnostic Readout Box (DRBIII(R)) scan tool.
  4. Turn ignition off. Connect Scope Input Cable (CH7058) to channel one connector on scan tool. Connect Red and Black leads and Cable-To-Probe Adapter (CH7062) to scope input cable. Go to next step.
  5. Using scan tool, select DRB STANDALONE, LAB SCOPE, LIVE DATA, then 12-VOLT SQUARE WAVE. Press F2 for scope. Press F2 again and use down arrow to set voltage range to 20 volts. Press F2 again. Go to next step.
  6. Connect Black lead to chassis ground. Connect Red lead to the PCI Bus circuit in the ACM connector. Observe voltage display on scan tool lab scope. If voltage pulses from zero to about 7.5 volts, replace ACM. See Figure -Figure . See AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS. If voltage does not pulse from zero to about 7.5 volts, go to next step.
  7. Disconnect the BCM C1 harness connector. Using a DVOM, measure the resistance of the PCI bus circuit between the ACM connector and the BCM C1 connector. If the resistance is below 5 ohms, replace the BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. If the resistance is 5 ohms or more, repair the PCI bus circuit for an open.
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