A/C Compressor Clutch Relay: Description

The A/C clutch relay is a International Standards Organization (ISO) micro-relay. Relays conforming to the ISO specifications have common physical dimensions, current capacities, terminal functions and patterns. The ISO micro-relay terminal functions are the same as a conventional ISO relay. However, the ISO micro-relay terminal pattern (or footprint) is different, the current capacity is lower, and the physical dimensions are smaller than those of the conventional ISO relay. See Fig 1.

The A/C clutch relay is located in the power distribution center (PDC) in the engine compartment.

Fig 1: Identifying Relay Terminals

Courtesy of DAIMLERCHRYSLER CORP.