Compressor circuit

When the a/c switch is turned on, the magnetic clutch on signal is sent from the air conditioning amplifier. Then the mg clt relay turns on to operate the magnetic clutch.

1. 1
   Perform active test by intelligent tester (a/c mag clutch)
2. 2
   Connect the intelligent tester (with can vim) to the dlc3.
3. 3
   Turn the ignition switch on and turn the intelligent tester main switch on.
4. 4
   Select the item below in the active test and then check that the compressor magnetic relay operates.

   

1. 1
   Inspect fuse (ecu-ig1)
2. 2
   Remove the ecu-ig1 fuse from the instrument panel junction block.
3. 3
   Measure the resistance of the fuse.

Standard resistance: below 1

3. Inspect magnetic clutch relay (marking: mg clt)

1. 1
   Remove the magnetic clutch relay from the engine room no. 1 Relay block.
2. 2
   Measure the resistance of the relay.

Standard resistance

4. Check wire harness (air conditioning amplifier - battery)

1. 1
   Disconnect the e37 amplifier connector.
2. 2
   Measure the voltage of the wire harness side connector.

Standard voltage

5. Check air conditioning amplifier (mgc voltage)

1. 1
   Remove the air conditioning amplifier with its connectors still connected.
2. 2
   Measure the voltage of the connector.

Standard voltage

6. Check magnetic clutch

1. 1
   Disconnect the b47 magnetic clutch connector.
2. 2
   Connect the battery's positive (+) lead to terminal 3 of the magnetic clutch and the negative (-) lead to the body ground.