2001 Lincoln towncar signature....PROBLEM:power door locks-trunk release-driver side power seat-keyless outer door entry-radio&clock......when weather is hot, door locks-trunk release-power seat-keyless entry will not work, radio has 2 be turned off manually...****when it is raining and humid, EVERY THING WORKS , including keyless outside entry...WHY ANY SUGGESTIONS? norm in Denver Colorado 303-668-3967.....mechanics are baffled and want to change everything

What mechanics ? No codes stored in driver door module or power seat module ? Or don't these mechanics know about that ?
Did you try the dealer ?
Diagnostic Trouble Code (DTC) Chart DTC Description Source Action B1201 Fuel Sender Circuit Failure HEC Module REFER to Section 413-01 . B1204 Fuel Sender Circuit Short to Ground HEC Module REFER to Section 413-01 . B1205 Failure (Open or Short to Battery) HEC Module REFER to Section 413-08 . B1208 HEC Switch-1 Assembly Circuit Short to Ground HEC Module REFER to Section 413-08 . B1213 PATS Number of Programmed Keys is Below Minimum HEC Module REFER to Section 419-01 . B1231 Longitudinal Acceleration Threshold Exceeded RCM REFER to Section 501-20B . B1232 PATS Bad Diagnostic Byte Received HEC Module REFER to Section 419-01 . B1249 Blend Door Failure EATC Module REFER to Section 412-00 . B1251 Climate Control Air Temperature Internal Sensor Circuit Open EATC Module REFER to Section 412-00 . B1253 Climate Control Air Temperature Internal Sensor Circuit Short to Ground EATC Module REFER to Section 412-00 . B1255 Climate Control Air Temperature External Sensor Circuit Short to Battery EATC Module REFER to Section 412-00 . B1257 Climate Control Air Temperature External Sensor Circuit Short to Ground EATC Module REFER to Section 412-00 . B1261 Climate Control Solar Radiation Sensor Circuit Short to Ground EATC Module REFER to Section 412-00 . B1312 Headlamp Input Circuit Short to Battery LCM REFER to Section 417-01 . B1317 Battery Voltage High HEC Module REFER to Section 414-00 . B1317 Battery Voltage High RCM REFER to Section 414-00 . B1317 Battery Voltage High Air Suspension Module REFER to Section 204-05 . B1318 Battery Voltage Low HEC Module REFER to Section 414-00 . B1318 Low Ignition Voltage During Speed Control Operation NGSC Module REFER to Section 310-03 . B1318 Battery Voltage Low Air Suspension Module REFER to Section 204-05 . B1318 Battery Voltage Low RCM REFER to Section 414-00 . B1322 Door Ajar LF Short to Ground DDM REFER to Section 501-14B . B1334 Decklid Ajar Rear Door Circuit Short to Ground LCM REFER to Section 501-14B . B1340 Chime Input Request Circuit Short to Ground LCM REFER to Section 501-20B . B1342 ECU is Defective ABS Module CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved, INSTALL a new ABS Module. REFER to Section 206-09 . CLEAR the DTCs. REPEAT the self-test. B1342 ECU is Defective ACM CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved, INSTALL a new ACM. REFER to Section 415-01 . CLEAR the DTCs. REPEAT the self-test. B1342 ECU is Defective CPM CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved, INSTALL a new CPM. REFER to Section 419-08 . CLEAR the DTCs. REPEAT the self-test. B1342 ECU is Defective DDM CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved, INSTALL a new DDM. REFER to Section 419-10 . CLEAR the DTCs. REPEAT the self-test. B1342 ECU is Defective DSM CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved, INSTALL a new DSM. REFER to Section 419-10 . CLEAR the DTCs. REPEAT the self-test. B1342 ECU is Defective HEC Module CLEAR and DOCUMENT the DTCs. PERFORM the HEC self-test. If DTC B1342 is retrieved, INSTALL a new HEC Module. REFER to Section 413-01 . CLEAR the DTCs. REPEAT the self-test. B1342 ECU is Defective LCM CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved, INSTALL a new LCM. REFER to Module-Lighting Control (LCM) in this section. CLEAR the DTCs. REPEAT the self-test. B1342 ECU is Defective NGSC Module CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved, INSTALL a new NGSC Module. REFER to Section 310-03 . CLEAR the DTCs. REPEAT the self-test. B1342 ECU is Defective Air Suspension Module CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved, INSTALL a new air suspension module. REFER to Module-Air Suspension in this section. CLEAR the DTCs. REPEAT the self-test. B1342 ECU is Defective RCM REFER to Section 501-20B . B1352 Ignition Key-In Circuit Failure LCM REFER to Section 413-09 . B1359 Ignition RUN/ACCY Circuit Failure LCM REFER to Section 211-05 . B1396 Power Door Lock Circuit Short to Battery DDM REFER to Section 501-14B . B1397 Power Door Unlock Circuit Short to Battery DDM REFER to Section 501-14B . B1402 Driver Power Window Down Circuit Failure DDM REFER to Section 501-11 . B1445 Door Handle Circuit Short to Ground DDM REFER to Section 501-14B . B1446 Wiper PARK Sense Circuit Failure LCM REFER to Section 501-16 . B1484 Brake Pedal Input Open Circuit ABS Module REFER to Section 206-09 . B1485 Brake Pedal Input Circuit Short to Battery LCM REFER to Section 417-01 . B1526 Keyless Entry Circuit Short to Ground DDM REFER to Section 501-14B . B1529 Memory Set Switch Circuit Short to Battery DDM REFER to Section 501-09 . B1533 Memory Position No. 1 Switch Circuit Short to Battery DDM REFER to Section 501-09 . B1537 Memory Position No. 2 Switch Circuit Short to Battery DDM REFER to Section 501-09 . B1545 Seat Direction Switch Assembly Circuit Short to Battery DDM REFER to Section 501-10 . B1549 Power Window Master Circuit Short to Battery DDM REFER to Section 501-11 . B1553 Decklid Release Circuit Short To Battery DDM REFER to Section 501-14B . B1555 RUN/START Input Circuit Failure LCM REFER to Section 211-05 . B1556 RF, LR, RR Door Ajar Circuits Short to Ground DDM REFER to Section 501-14B . B1569 Headlamp High Beam Circuit Short to Battery LCM REFER to Section 417-01 . B1577 Parking Lamp Input Short to Battery LCM REFER to Section 417-01 . B1581 Panel Dim Increase Input Circuit Short to Battery LCM REFER to Section 413-00 . B1585 Panel Dim Decrease Input Circuit Short to Ground LCM REFER to Section 413-00 . B1600 PATS Key Problem - No Key Code HEC Module REFER to Section 419-01 . B1601 PATS Received Non-Programmed Key Code HEC Module REFER to Section 419-01 . B1602 PATS Received Invalid Key Code Format HEC Module REFER to Section 419-01 . B1663 Driver Seat Front Up/Down Motor Stalled DSM REFER to Section 501-10 . B1664 Driver Seat Rear Up/Down Motor Stalled DSM REFER to Section 501-10 . B1665 Driver Seat Forward Backward Motor Stalled DSM REFER to Section 501-10 . B1666 Driver Seat Fwd/Bwd Recline Motor Stalled DSM REFER to Section 501-10 .
Also do there know anything about serial data bus ?
Plus , do they know what voltage drop testing a electrical circuit is . I should find better mechanics .