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SUBJECT: New HVAC Sub-Assembly Replaces Blend Or Recirc Door Components MODELS: 1999 – 2004 (WJ/WG) Grand Cherokee (All Markets) New HVAC sub-assemblies are now available in the Mopar Parts system. Each new sub-assembly consists of several individual components. The new sub-assemblies improve component reliability. It is recommended that the respective sub-assembly be installed if a blend air door(s), a recirculation door, a door link, or a sub-assembly housing requires replacement. The following table provides the part numbers for the new HVAC sub-assemblies.

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Fig.17 Center Dash Bezel. 1. Remove ash tray, then six center cluster bezel screws and center bezel. 2. Remove two screws holding dash pad located behind top of center bezel, then gently pry defroster grille out of dash pad. Fig.18 Dash Pad & Instrument Cluster. 3. 4. 5. 6. Disconnect sensors, if equipped, and set defroster grille aside. Remove four screws in defroster duct opening holding dash pad. Remove three screws above instrument panel cluster, then open glove box and remove two screws holding dash pad. Remove dash pad by pulling up to unsnap end clips. If dash switch pod removal is necessary, proceed as follows: a. Remove one screw from left side, near driver’s door, of the lower trim panel. b. Remove one screw from bottom of lower trim panel, then pull panel off. c. Remove four screws holding steering column cover, then three screws holding bottom of bezels. d. Remove two screws retaining top of end and switch pod bezels, then remove the bezel. e. Remove two screws holding left side of switch pod and three screws on the RH side of switch pod bezel. f. Pull switch pod bezel out to remove switch connectors, then disconnect connectors from each switch pod and remove bezel. g. Remove switch retaining screws, then the switch. 7. Remove three screws from top of cluster, then lift cluster up to allow access to connectors. 8. Disconnect connector and remove cluster. 9. Reverse procedure to install.

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1. Disconnect negative battery cable. Remove bezel near inside door latch release handle by inserting a flat- bladed screwdriver into notched end of bezel and prying gently upward. Remove door trim panel mounting screw located in bezel opening near door latch release handle. 2. Remove trim cap and screw near rear of door armrest. Remove trim cap and screw at upper front corner of trim panel. Using a trim stick or other suitable flat-bladed tool, pry trim panel away from door around perimeter, starting at bottom of door, and remove trim panel. 3. Disconnect chassis wiring from door multiplex switch module. Pull watershield away from rear access holes in inner door panel. Remove “U” clip retainer securing lock cylinder. Disconnect lock cylinder rod from door latch by unsnapping retainer from rod. 4. Pull lock cylinder out from outer door panel far enough to pry lock cylinder switch off back of lock cylinder. Disconnect chassis wiring and remove switch from inside door. To install, reverse removal procedure

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NOTE: NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see GRAND CHEROKEE wiring diagram in WIRING DIAGRAMS article. DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM is monitored during engine cranking. DTC may be stored in Powertrain Control Module (PCM) when PCM senses no Crankshaft Position (CKP) sensor signal during engine cranking, and at least 3 Camshaft Position (CMP) sensor signals have occurred. Possible causes are: defective tone wheel/flexplate, defective PCM, defective CKP sensor, defective CMP sensor, defective connectors or defective wiring. 1. Turn ignition on, with engine off. Using scan tool, read current CKP count and attempt to start engine. If current CKP count does not change while attempting to start engine, go to next step. If current CKP count changes while attempting to start engine, go to step 16). 2. Turn ignition off. Disconnect CKP sensor connector. See Fig. 26 or Fig. 27 . Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on CKP sensor connector, 5-volt supply circuit (Orange wire). If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, repair open 5-volt supply circuit. Perform TEST VER-5A.

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Customer Concern: Tests/Procedures: Potential Causes: Intermittent no crank condition. Customer reports hearing a single click. Tried new starter. It happens intermittently. It is cranking normally right now. 1. Test the battery first. Replace as needed. Be sure to check all the cable connections. 2. Duplicate the problem and see if there is power getting to the starter on the Yellow/Grey wire in the crank position. 3. Check the voltage drop of the cables or simply use jumper cables to see if it will crank over, if it does the cable(s) are at fault. Battery Cables Connector