System Troubleshooting

AIR CONDITIONER ELECTRICAL TROUBLESHOOTING
1. Check the fuses No. 21, 22, 9, 5, and 12 first.





2. Disconnect the pressure switch connector, then connect the Blue/R (1) terminal to ground.
Turn the ignition switch ON; the cooling condenser fans should start turning and compressor clutch should engage.
- If both fans and compressor come on, go to step 6.





3. If the fan motors do not come on, disconnect the diode connector and connect the Blue terminal to ground.
The fan motors should start.
- If the motors do not start, replace the cooling fan relay with new one and retest.
- If the motors turn, there is an open in the Blue wire.

4. If the compressor clutch does not engage, disconnect the diode coupler and connect the R/Blue terminal to ground.
Turn the ignition switch ON, the compressor clutch should engage.
- If the clutch works, check the diodes.
- If the diodes are OK, there is an open in Blue/R wire.
- If the clutch does not engage, go to step 5.





5. Connect the Y terminal at the clutch relay connector to ground with the connector connected.
Turn the ignition switch ON, the clutch should work.
- If not, check the clutch relay.
- If the clutch relay is OK, check compressor clutch and/ or R wire.
- If the clutch works, check the delay unit.





6. Connect the pressure switch and diode connectors.
Connect the Blue/R (1) terminal to ground with the thermostat connector connected.
Turn the ignition switch ON, the compressor clutch should come on.
- If not, there is an open in Blue/R wire between the pressure switch and thermostat.
If the clutch works, connect the Blue/R (2) wire to ground.
- The clutch should come on. If not, replace the thermostat.





7. Remove the A/C switch. Connect the Blue/R terminal to ground.
Turn the ignition switch ON, the clutch should come on.
- If not, there is an open in Blue/R wire between the A/C switch and thermostat.
- If OK, go to step 8.





8. Connect a jumper wire to the Blue/R (1) and G terminals.
Turn the ignition switch ON, the clutch should come on.
- If not, check the blower fan switch.
- If the blower switch is OK, there is an open in G wire between the A/C switch and blower switch or in Bl between the GND-12 and blower switch.