DTC P0645-A: A/C CLUTCH RELAY CIRCUIT Chrysler LHS II

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

Scheme 55

Scheme 56

1. Using scan tool, actuate A/C clutch relay. A/C clutch relay is located in Power Distribution Center (PDC). If A/C clutch relay is clicking, go to next step. If A/C clutch relay is not clicking, go to step 5.
2. Condition to set trouble code is not present at this time. A/C CLUTCH RELAY CIRCUIT DTC sets if an open or short is detected in A/C clutch relay control circuit. Possible causes are: relay coil open or shorted, fused ignition switch output circuit open, compressor clutch relay control circuit open or shorted, inoperative circuit driver in Powertrain Control Module (PCM), faulty connections or wiring. Go to next step.
3. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, go to next step. If related wiring and connectors were repaired, perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000).
4. With scan tool still actuating A/C clutch relay, wiggle wiring harness from A/C clutch relay to PCM. If wiggling interrupted A/C clutch relay actuation, repair wiring harness as necessary where wiggling caused problem to appear. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000). If wiggling did not interrupt A/C clutch relay actuation, see «INACTIVE TROUBLE CODE CONDITION»(ref-576-S27765318282000030800000) under SELF-DIAGNOSTICS. Test is complete. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000).
5. Disconnect A/C clutch relay. Using a 12-volt test light, check A/C clutch relay connector fused ignition switch output circuit. See «A/C CLUTCH RELAY CONNECTOR WIRE IDENTIFICATION»(ref-576-S16401285512000030800000) table. (Scheme 55) If test light is brightly illuminated, go to next step. If test light is not brightly illuminated, repair open or high resistance in fused ignition switch output circuit. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000). A/C CLUTCH RELAY CONNECTOR WIRE IDENTIFICATION Application Wire Color Terminal A Fused Ignition Switch Output Circuit Light Green/Black Terminal C A/C Clutch Control Circuit Dark Blue/Orange
6. Using an ohmmeter, check resistance across A/C clutch relay terminals. (Scheme 56) If resistance is less than 100 ohms, go to next step. If resistance is 100 ohms or more, replace A/C clutch relay. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000).
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an ohmmeter, check resistance of A/C clutch relay connector A/C clutch control circuit. See «A/C CLUTCH RELAY CONNECTOR WIRE IDENTIFICATION»(ref-576-S16401285512000030800000) table. (Scheme 55) If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in A/C clutch relay control circuit. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000).
8. Using an ohmmeter, check resistance of A/C clutch relay control circuit between A/C clutch relay connector and PCM connector terminal No. 64. See «A/C CLUTCH RELAY CONNECTOR WIRE IDENTIFICATION»(ref-576-S16401285512000030800000) table and «PCM CONNECTOR WIRE IDENTIFICATION»(ref-576-S07823845222000030800000) table. If resistance is less than 5 ohms, replace PCM. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000). If resistance is 5 ohms or more, repair open A/C clutch relay control circuit. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000).

PCM CONNECTOR WIRE IDENTIFICATION