Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the dual automatic temperature control (DATC) or electronic automatic temperature control (EATC) module	Fuse(s) Circuitry open DATC/EATC module communication network	GO to PINPOINT TEST F .
The DATC/EATC system is inoperative, intermittent or incorrect operation	Fuse(s) Circuitry open Automatic temperature control aspirator hose and elbow	GO to PINPOINT TEST G .
Air inlet door is inoperative	Circuitry open/shorted DATC/EATC module EMTC module Air inlet door actuator/linkage	GO to PINPOINT TEST D .
Incorrect/erratic direction of airflow from outlets	Circuitry short/open Door actuator Mode door binding or stuck EMTC module or DATC/EATC module Door actuator arm not connected to the door crank	GO to PINPOINT TEST E .
Insufficient, erratic or no heat	Low engine coolant level Engine overheating Plugged or partially plugged heater core Temperature blend door is binding or stuck Temperature blend door actuator Heater hose is kinked or binding	GO to PINPOINT TEST H .
The air conditioning (A/C) is inoperative/does not operate correctly	Open fuse Circuitry short/open A/C system discharged/low charge PCM DATC/EATC module EMTC module A/C compressor clutch air gap A/C clutch relay	GO to PINPOINT TEST I .
The air conditioning (A/C) is always on	Circuitry short/open DATC/EATC module EMTC module PCM A/C compressor clutch air gap A/C clutch relay	GO to PINPOINT TEST J .
Temperature control is inoperative/does not operate correctly	Circuitry open/shorted DATC/EMTC module EATC module Temperature blend door Temperature blend door actuator Door actuator arm not connected to the door crank	GO to PINPOINT TEST K .
The blower motor is inoperative - EMTC	Fuse(s) Circuitry open/shorted A/C blower motor switch Blower motor relay A/C blower motor EMTC module	GO to PINPOINT TEST L .
The blower motor does not operate correctly - EMTC	Circuitry shorted A/C blower motor resistor A/C blower motor switch	GO to PINPOINT TEST M .
The blower motor is inoperative - DATC/EATC	Fuse(s) Circuitry short/open Blower motor relay A/C blower motor DATC/EATC module A/C blower motor speed control	GO to PINPOINT TEST N .
The blower motor does not operate correctly - DATC/EATC	Circuitry short A/C blower motor speed control DATC/EATC module A/C blower motor speed control	GO to PINPOINT TEST O .
The steering wheel control switch is inoperative/does not operate correctly	Circuitry short/open Steering wheel control switch DATC/EATC module	GO to PINPOINT TEST P .
The dual temperature control is inoperative/does not operate correctly	Temperature blend door/actuator broken/binding DATC module Low A/C refrigerant charge	CHECK that the A/C system pressure is above 290 kPa (42 psi). If the pressure is below 290 kPa (42 psi), REFER to FLUORESCENT DYE LEAK DETECTION . CHECK the temperature blend doors/actuators for a binding or broken condition. If no condition is found, INSTALL a new DATC module.
The temperature set point does not repeat after turning the ignition switch OFF	Open fuse Circuitry short/open DATC/EATC module	CHECK circuit SBP07 (WH/RD) for a short or open and repair as necessary. If okay, INSTALL a new DATC/EATC module.
The temperature display will not switch between Celsius and Fahrenheit	DATC/EATC module IC module	If the instrument cluster does not switch between English and Metric, Refer to INSTRUMENT CLUSTER AND PANEL ILLUMINATION .
	DATC/EATC module IC module	If only the EATC module does not switch between English and Metric, INSTALL a new DATC/EATC module.
Inaccurate external temperature display	DATC/EATC module	REFER to DATC/EATC EXTERNAL TEMPERATURE DISPLAY . If the external temperature display is not operating as described and no DTC is present, CARRY OUT the AMBIENT TEMPERATURE SENSOR component test. If the sensor tests OK, INSTALL a new DATC/EATC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.