DTC P0645: A/C CLUTCH RELAY CIRCUIT Dodge Durango I

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.

Note. A/C clutch relay may also be referred to as A/C compressor clutch relay. A/C clutch relay circuit is monitored when ignition is on and battery voltage is more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) if an open or short exists in A/C clutch relay control circuit. Possible causes are: defective A/C clutch relay, defective PCM, or defective connectors or wiring.

1. Turn ignition on with engine off. Using scan tool, actuate A/C clutch relay. Listen for clicking sound at A/C clutch relay. The A/C clutch relay is located in power distribution center at driver's side front corner of engine compartment, near battery. (Схема №54) If clicking sound is heard at A/C clutch relay, go to next step. If clicking sound is not heard at A/C clutch relay, go to step 4.
2. Turn ignition off. Inspect wiring harness and connectors between PCM and A/C clutch relay. PCM is located at passenger's side front corner of engine compartment on inner fender panel. If no problems exist, go to next step. If any problems exist, repair wiring or connectors as necessary. Perform «TEST VER-2»(ref-9482-S03161005942000102700000).
3. Turn ignition on with engine off. Using scan tool, actuate A/C clutch relay. Wiggle wiring harness and connectors between A/C clutch relay and PCM while A/C clutch relay is still actuated. If clicking sound at A/C clutch relay was not interrupted while wiggling wiring harness and connectors, test is complete. If clicking sound at A/C clutch relay was interrupted while wiggling wiring harness and connectors, repair wiring or connectors as necessary. Perform «TEST VER-2»(ref-9482-S03161005942000102700000).
4. Turn ignition off. Remove A/C clutch relay from power distribution center. Turn ignition on with engine off. Using voltmeter, check voltage at cavity No. 86 (Red/Dark Green wire) in power distribution center for A/C clutch relay. (Схема №54) If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open between ignition switch, fuse No. 7 (15-amp), and Red/Dark Green wire between fuse No. 7, joint connector No. 1 and cavity No. 86 in power distribution center for A/C clutch relay. Fuse No. 7 is located in junction block on end of driver's side of instrument panel, near door opening. Joint connector No. 1 is located in power distribution center. (Схема №54) Perform «TEST VER-2»(ref-9482-S03161005942000102700000).
5. Note which terminals on A/C clutch relay correspond with cavities in power distribution center. (Схема №54) Using ohmmeter, check resistance between terminals on A/C clutch relay that correspond with cavities No. 85 and 86 in power distribution center. If resistance 50-90 ohms, go to next step. If resistance is not 50-90 ohms, replace A/C clutch relay. Perform «TEST VER-2»(ref-9482-S03161005942000102700000).
6. Ensure ignition is off and A/C clutch relay is still removed from power distribution center. Disconnect PCM connectors. PCM is located at passenger's side front corner of engine compartment on inner fender panel. Using ohmmeter, check resistance between cavity No. 85 (Dark Blue/Orange wire) in power distribution center for A/C clutch relay and terminal No. 1 (Dark Blue/Orange wire) on PCM connector C3. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open on Dark Blue/Orange wire between PCM and cavity No. 85 in power distribution center for A/C clutch relay. Perform «TEST VER-2»(ref-9482-S03161005942000102700000).
7. Ensure A/C clutch relay is still removed from power distribution center and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and terminal No. 1 (Dark Blue/Orange wire) on PCM connector C3. If resistance is 5 ohms or more, replace PCM. Perform «TEST VER-2»(ref-9482-S03161005942000102700000). If resistance is less than 5 ohms, repair short to ground on Dark Blue/Orange wire between PCM and cavity No. 85 in power distribution center for A/C clutch relay. Perform «TEST VER-2»(ref-9482-S03161005942000102700000).