Problem:The vehicle came into the shop because
the A/C was not working. The compressor did not engage when the
A/C was selected in the dash.
Details: The technician installed A/C gauges to
check if there was pressure in the system. The
A/C system had the appropriate amount of pressure in both the
high and low sides.
Next, the technician connected a scan tool and retrieved DTC
P0645 (A/C Control Circuit Open) from the PCM. After looking at a
wiring diagram to identify the circuits, wires and connectors
that would be involved, the tech inspected the A/C control
circuit wiring at the Total Integrated Power Module (TIPM). He
found that a LB/OR (light blue/orange) wire at connector C5, pin
11 had corroded to the point of breaking.
Confirmed Repair: The tech cleaned the pins on
both sides of the connector, replaced the corroded pin and
spliced-in a new section of wire to complete the repair. The A/C
compressor was operational and the A/C system pressure and duct
temperature tests met specifications.