W/Harness Inspection

P0646 A/C Clutch Relay Control Circuit Low

Inspection/Repair - W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination,deterioration, or damage.
3. Has a problem been found?
YES
1) Repair as necessary and go to "Verification of vehicle Repair" procedure
NO
1) Go to "Power circuit inspection" procedure.

Power Supply Circuit Inspection

1. Check Voltage of power circuit from battery
(1) IG "OFF".
(2) Disconnect A/C Relay.
(3) IG "ON".
(4) Measure the voltage between terminal 3 of A/C Relay harness connector and ground.
A. Specification : B+




(5) Is the measured voltage within specification?
YES
1) Go to "Control circuit inspection" procedure.
NO
1) Check "10A SNSR" fuse between a main relay and a A/C relay.
2) Check Open or Short to ground in power circuit of A/C relay and then go to "Verification of vehicle Repair" procedure.

Control Circuit Inspection

1. IG "OFF".
2. Disconnect A/C Relay.
3. IG "ON".
4. Measure the voltage between terminal 5 of A/C relay and ground.
A. Specification : Approx. 11 V




5. Is the measured voltage within specification?
YES
1) Go to "Component inspection" procedure.
NO
1) Repair Short to ground in A/C relay control circuit and then go to "Verification of Vehicle Repair" procedure.