Many malfunctions in the electrical system are caused by poor connection. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Control Circuit Inspection" procedure.

Ignition "OFF"

Refer to "Shop Manual" and remove necessary parts to get access to A/C control module connector.

Ignition "ON"

Operate Mode Switch.

Back probe and measure voltage between Pin No. 6 (DEF) terminal of A/C control module harness conenctor and chassis ground.

Back probe and measure voltage between Pin No. 5 (VENT) terminal of A/C control module harness conenctor and chassis ground.

Fig.1) Direction Potentiometer-Driver Data & Direction Control Motor Signal Waveform when operating Mode switch to "VENT"

Fig.2) Direction Potentiometer-Driver Data & Direction Control Motor Signal Waveform when operating Mode switch to "DEF"

Is measured value within specification?

	▶ Go to "Component Inspection" procedure.
	▶ Carefully re-do this troubleshooting guide steps. ▶ If problem still occurs, replace A/C Control Module and then go to "Verification of Vechicle Repair" procedure.