Dynasty L4-153 2.5L SOHC (1988)
Door Lock Switch: Testing and Inspection
Door Lock Switch Continuity
Remove the door switch from the trim panel and carefully separate the wiring harness from the back of the switch. Connect a test light between the red
and black wires. 
If the test light comes on, the power and ground sources to the switch are sufficient.
If the test light does not come on or is dim, check the circuit breaker and wiring.
Next, use an ohmmeter to check the switch for continuity through the proper pins in the indicated positions. If the continuity is not correct, replace the
 Use an external ground source when checking the right door harness.