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Symptom Chart

SYMPTOM CHART

Condition Possible Sources Action
No communication with the front electronics module (FEM) - unable to carry out the front electronics module (FEM) self-test
  • Fuse.
  • Low battery voltage.
  • Open ground circuit.
 Go To PINPOINT TEST A .
No communication with the rear electronics module (REM) - unable to carry out the rear electronics module (REM) self-test
  • Fuse.
  • Open ground circuit.
 Go To PINPOINT TEST B .
No communication with the hybrid electronic instrument cluster (HEC) - unable to carry out the hybrid electronic instrument cluster (HEC) self-test
  • Low battery voltage at the HEC.
  • Open HEC ground.
 Go To PINPOINT TEST C .
Incorrect/erratic direction of airflow from outlet
  • Function selector switch.
  • A/C vacuum check valve.
  • Vacuum hose.
  • A/C vacuum reservoir tank and bracket.
  • Vacuum control motor.
  • Vacuum actuator arm.
 Go To PINPOINT TEST D .
Insufficient, erratic, or no heat
  • Low engine coolant level.
  • Engine overheating.
  • Plugged or partially plugged heater core.
  • Temperature blend door binding/stuck.
  • A/C electric blend door actuator.
 Go To PINPOINT TEST E .
The A/C does not operate/does not operate correctly
  • Fuse.
  • Circuitry short/open.
  • A/C cycling switch.
  • A/C system.
  • Function selector switch.
  • A/C refrigerant.
 Go To PINPOINT TEST F .
The A/C is always on
  • Circuitry short/open.
  • A/C cycling switch.
  • A/C control.
 Go To PINPOINT TEST G .
No operation in all the temperature settings
  • Temperature blend door.
  • Temperature blend door actuator control.
  • A/C electronic blend door actuator motor.
  • Circuitry short/open.
 Go To PINPOINT TEST H .
The blower motor does not operate/does not operate correctly
  • Fuse.
  • Circuitry short/open.
  • A/C blower motor switch.
  • A/C blower motor resistor.
  • A/C blower motor.
 Go To PINPOINT TEST I .
The blower motor operates continuously in high speed
  • Circuitry short/open.
  • A/C blower motor resistor.
  • A/C blower motor switch.
 Go To PINPOINT TEST J .
No operation in high blower setting
  • A/C open circuit.
  • A/C blower motor switch.
 Go To PINPOINT TEST K .
No operation in low blower setting
  • A/C open circuit.
  • A/C blower motor resistor.
  • A/C blower motor switch.
 Go To PINPOINT TEST L .
The auxiliary blower motor is inoperative
  • Fuse.
  • Circuitry short/open.
  • Auxiliary blower motor resistor.
  • Auxiliary blower motor.
 Go To PINPOINT TEST M .
The auxiliary blower motor does not operate correctly
  • Fuse.
  • Circuitry short/open.
  • Auxiliary blower motor relay.
  • Auxiliary blower motor speed relay 1.
  • Auxiliary blower motor speed relay 2.
  • Rear auxiliary control.
  • Auxiliary blower motor resistor.
 Go To PINPOINT TEST N .
The panel/floor controls do not operate using the front/rear auxiliary controls
  • Low battery reference voltage.
  • Short to ground.
  • Short to battery.
  • Rear air mode actuator.
  • Rear air temperature door actuator.
  • Rear control module.
 Go To PINPOINT TEST O .
The temperature controls do not operate using the front/rear auxiliary climate control
  • Fuse.
  • Auxiliary air temperature door motor.
  • Auxiliary air temperature door.
  • Short to ground.
  • Short to battery.
 Go To PINPOINT TEST P .
The panel/floor and cool/warm controls do not operate using the front/rear auxiliary controls
  • Circuitry short/open.
  • Auxiliary climate control module.
 Go To PINPOINT TEST Q .
The panel/floor and warm/cold control does not operate/does not operate correctly using the rear auxiliary controls
  • Circuitry short/open.
  • Front/rear auxiliary potentiometer.
  • Auxiliary blend door actuator.
  • Auxiliary climate control module.
 Go To PINPOINT TEST R .
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