Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Recirculation Actuator Ignition | 1 | 1 | -- | -- |
Recirculation Door Control A | 1 | 1 | 1 | -- |
Recirculation Door Control B | 1 | 1 | 1 | -- |
Recirculation Door Position Signal | 1 | 1 | 1 | -- |
1. Recirculation Actuator Inoperative | ||||
Circuit/System Description
When the recirculation switch is pressed, a signal is sent from the HVAC control assembly to the recirculation actuator through the recirculation door control circuits. When the recirculation actuator receives the signal, the actuator moves into the recirculation mode, this recirculates the air inside of the vehicle instead bringing fresh air from the outside. Power is provided from the instrument panel fuse block, through the blower motor relay to the recirculation actuator. The HVAC control assembly monitors the position of the recirculation door from a signal sent over the recirculation door signal circuit.
Diagnostic Aids
Inspect the recirculation door and the recirculation actuator for the following conditions:
| • | A misaligned recirculation actuator |
| • | Broken or binding linkages or recirculation door |
| • | An obstruction that prevents the recirculation door from operating within its full range of motion |
| • | Missing seals to the recirculation door |
| • | Misaligned seals to the recirculation door |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the recirculation actuator.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal D and ground.
- Connect a test lamp between control circuit terminal C and control circuit terminal F.
- Command the actuator in both directions by using the recirculation control switch to select FRESH and RECIRCULATE. The test lamp should turn ON and OFF with each command.
- Ignition ON, test for 4.8-5.2 volts between the door position signal circuit terminal G and ground.
- If all circuits test normal, test or replace the recirculation actuator.
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp is always ON or always OFF during either of the commands, test both control circuits for a short to voltage, short to ground, or an open/high resistance. If the circuits test normal, replace the HVAC control assembly. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HVAC control assembly. |
| ⇒ | If less then specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for HVAC control assembly replacement, setup, and programming |
