CL V6-3.2L SOHC (2002)
Dose the voltage change from about 1 V to 3 V?
YES - Substitute a known good passenger's multiplex control unit, and recheck. If the Systems now work OK, replace the original passenger's unit.
NO - Repair open or short in the GRY wire. If the wire is OK, faulty left power mirror position sensor, replace the left power mirror actuator.