2002 Jeep Grand Cherokee OverlandFACTORY OEM SERVICE PROCEDURE

No Response From Intrusion Transceiver Module

Possible Causes are:

  • ATTEMPT TO COMMUNICATE WITH THE BCM
  • GROUND CIRCUIT OPEN
  • FUSED B (+) CIRCUIT OPEN
  • OPEN PCI BUS CIRCUIT
  • INTRUSION TRANSCEIVER MODULE

NOTE: Ensure there is PCI Bus communication with other modules on the vehicle before proceeding. If no, diagnose using appropriate procedure. See COMMUNICATION  under DIAGNOSTIC TESTS.
  1. Turn ignition on. Using the DRBIII(R), attempt to communicate with the BCM. Was the DRBIII(R) able to I/D or communicate with the BCM? If yes, go to next step. If no, go to BUS +/- SIGNALS OPEN OR NO RESPONSE FROM BODY CONTROL MODULE  . Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
  2. Turn ignition off. Disconnect the Intrusion Transceiver Module harness connector. Using a 12-volt test light connected to 12 volts, probe the ground circuit. Is the test light illuminated? If yes, go to next step. If no, repair the ground circuit for an open. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
  3. Turn ignition off. Disconnect the Intrusion Transceiver Module harness connector. Using a 12-volt test light connected to ground, probe the Fused B (+) circuit. Is the test light illuminated? If yes, go to next step. If no, repair the Fused B+ circuit for an open. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
  4. Disconnect the Intrusion Transceiver Module harness connector. Use Scope Input Cable (CH7058), Cable To Probe Adapter (CH7062), and the Red and Black test probes. Connect the scope input cable to the channel one connector on the DRBIII(R). Attach the Red and Black leads and the cable to probe adapter to the scope input cable. Using the DRBIII(R), select Pep Module Tools. Select lab scope. Select Live Data. Select 12-volt square wave. Press F2 for Scope. Press F2 and use the down arrow to set voltage range to 20 volts. Set Probe to x10. Press F2 again, when complete. Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus circuit in the ITM connector. Turn ignition on. Observe the voltage display on the DRBIII(R) Lab Scope. Does the voltage pulse from 0 to approximately 7.5 volts? If yes, replace the Intrusion Transceiver Module. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, repair the PCI Bus circuit for an open. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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