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Not Receiving Bus Message Correctly

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn ignition off. Disconnect Controller Anti-Lock Brake (CAB) module connector. CAB module is located on right side of engine compartment and has a Black 25-pin connector. Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. If connector is okay, turn ignition on. If scan tool does not display NOT RECEIVING BUS MESSAGE CORRECTLY, replace CAB module. If scan tool displays NOT RECEIVING BUS MESSAGE CORRECTLY, go to next step.
  2. Turn ignition off and wait 2 minutes to allow air bag system back-up power source to discharge. Disconnect Air Bag Control Module (ACM) 13-pin connector. ACM is located under center of instrument panel. Turn ignition on. If scan tool does not display NOT RECEIVING BUS MESSAGE CORRECTLY, replace ACM. If scan tool displays NOT RECEIVING BUS MESSAGE CORRECTLY, go to next step.
  3. If vehicle is not equipped with Compass/Mini-Trip Computer (CMTC), go to next step. If vehicle is equipped with CMTC, turn ignition off. Disconnect CMTC located behind overhead console. Turn ignition on. If scan tool does not display NOT RECEIVING BUS MESSAGE CORRECTLY, replace CMTC. If scan tool displays NOT RECEIVING BUS MESSAGE CORRECTLY, go to next step.
  4. Turn ignition off. Disconnect instrument cluster connector. Turn ignition on. If scan tool does not display NOT RECEIVING BUS MESSAGE CORRECTLY, replace instrument cluster. If scan tool displays NOT RECEIVING BUS MESSAGE CORRECTLY, go to next step.
  5. If vehicle is not equipped with Transmission Control Module (TCM), go to next step. If vehicle is equipped with TCM, turn ignition off. Disconnect TCM connector located in engine compartment on right fenderwell. Turn ignition on. If scan tool displays NOT RECEIVING BUS MESSAGE CORRECTLY, go to next step. If scan tool does not display NOT RECEIVING BUS MESSAGE CORRECTLY, replace TCM. Set pinion factor to ensure correct tire size is set for proper speedometer operation. See appropriate PINION FACTOR PROCEDURE in COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
  6. Turn ignition off. Disconnect CCD radio Black 2-pin connector. Turn ignition on. If scan tool does not display NOT RECEIVING BUS MESSAGE CORRECTLY, replace radio. If scan tool displays NOT RECEIVING BUS MESSAGE CORRECTLY, go to next step.
  7. Turn ignition off. Disconnect Powertrain Control Module (PCM). PCM is located in engine compartment between left inner fender and power distribution center. Turn ignition on. If scan tool does not display NOT RECEIVING BUS MESSAGE CORRECTLY, replace PCM. If scan tool displays NOT RECEIVING BUS MESSAGE CORRECTLY, go to next step.
  8. Turn ignition off. Disconnect Heating/Ventilation Air Conditioning (HVAC) module. HVAC module is part of heating-A/C control assembly in center of instrument panel. Turn ignition on. If scan tool does not display NOT RECEIVING BUS MESSAGE CORRECTLY, replace HVAC module. If scan tool displays NOT RECEIVING BUS MESSAGE CORRECTLY, go to next step.
  9. Turn ignition off. Disconnect Body Control Module (BCM) connectors. BCM is located with junction block under driver's side instrument panel. See Figure . Turn ignition on. If scan tool does not display NOT RECEIVING BUS MESSAGE CORRECTLY, replace BCM. If scan tool displays NOT RECEIVING BUS MESSAGE CORRECTLY, replace scan tool cable or scan tool.
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