3.
Measure resistance between terminal "1" and "2" of ambient sensor
a.
Specification : Refer the specifications in fig3)
Ignition "OFF"
Disconnect ambient sensor.
Measure resistance between terminal "1" and "2" of ambient sensor
Specification : Refer the specifications in fig3)
Is the measured resistance within specifications in fig3)? (tolerance limits ±3%)
YES
Go to "Check A/C Control Unit" procedure
NO
Substitute with a known-good ambient sensor and check for proper operation. If the problem is corrected, replace ambient sensor and then go to "Verification of Vehicle Repair" procedure.
Engine : "ON"
Disconnect ambient sensor.
Measure voltage between terminal "3" of A/C Control Unit and chasis ground
Specification :Approx. 5V
Is the measured voltage within specifications?
YES
Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
Substitute with a known-good A/C Control Unit and check for proper operation. If the problem is corrected, replace A/C Control Unit and then go to "Verification of Vehicle Repair" procedure.
