929 V6-3.0L DOHC (1993)
1. Remove the A/C relay.
2. Turn the ignition switch ON and press the AUTO switch ON.
3. Measure voltage at terminal wires (R) and (R/W) of the A/C relay connector in the relay box.
Step 4
A/C relay inspection
1. Remove the A/C relay.
2. Connect battery positive voltage to the terminal b and ground the terminal c of the relay.
3. Check continuity between terminals a and b of the relay.
Step 5
A/C relay operation inspection
1. Connect a jumper wire between terminal wire L/W and a body ground.
2. Turn the ignition switch ON, and turn the AUTO switch ON.
3. If the compressor operates, repair the wiring harness and/or check the ECU.