A/C Magnet Valve Circuit Troubleshooting

NOTE: Do not use this troubleshooting procedure if the fans are also inoperative, or if the A/C compressor is inoperative. Refer to the symptom troubleshooting index.

1.Check the No. 14 (10 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?


YES - Go to 2.


NO - Replace the fuse, and recheck.n


2.Disconnect the magnet valve 2P connector.

3.Turn the ignition switch ON (II).

4.Measure the voltage between the No. 2 terminal of the magnet valve 2P connector and body ground.

 

Is there battery voltage?


YES - Go to 5.


NO - Repair open in the wire between the No. 14 fuse in the under-dash fuse/relay box and the magnet valve.n

5.Turn the ignition switch OFF.

6.Reconnect the magnet valve 2P connector.

7.Connect the No. 1 terminal of the magnet valve 2P connector to body ground with a jumper wire with the magnet valve connectors connected.

 

8.Turn the ignition switch ON (II).

Does the magnet valve operate?


YES - Go to 9.


NO - Replace the magnet valve, and recheck.n


9.Turn the ignition switch OFF.

10.Disconnect the magnet valve 2P connector.

11.Disconnect the heater control panel 36P connector.

12.Check for continuity between the No. 24 terminal of the heater control panel 36P connector and the No. 1 terminal of magnet valve 2P connector.

 

Is there continuity?


YES - Check for loose wires or poor connections at the heater control panel 36P connector and at the magnet valve 2P connector. If the connections are good, substitute a known-good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel.n


NO - Repair open in the wire between the heater control panel and the magnet valve.n