Recirculated Air Switchover Valve Circuit

WHEN MONITORED
With the ignition on.

SET CONDITION
The A/C Heater Control Module detects an abnormal condition on the Recirculated Air Switchover Valve Control circuit.

POSSIBLE CAUSES
- Fused B(+) circuit open
- Recirculated air switchover valve control circuit open
- Recirculated air switchover valve
- A/C heater control module

Diagnostic Test




1. MEASURE RECIRCULATED AIR SWITCHOVER VALVE VOLTAGE

NOTE: Inspect Fuse 37 located in the Underhood Accessory Fuse Block. If the fuse is open, repair the cause of the open fuse before continuing.

Disconnect the Recirculated Air Switchover Valve harness connector.

NOTE: Check connector - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Fused B(+) circuit at the Recirculated Air Switchover Valve harness connector.

Q: Is the voltage above 10 volts?

YES: Go to 2
NO: Repair the Recirculated Air Switchover Valve Fused B(+) circuit. Perform BODY VERIFICATION TEST. Body Verification Test




2. MEASURE THE RESISTANCE OF THE RECIRCULATED AIR SWITCHOVER VALVE CONTROL CIRCUIT

Turn the ignition off. Disconnect the Recirculated Air Switchover Valve harness connector.

NOTE:
- Check connector - Clean/repair as necessary. Disconnect the A/C Heater Control Module harness connector.
- Check connector - Clean/repair as necessary. Measure the resistance of the Recirculated Air Switchover Valve Control circuit from the Recirculated Air Switchover Valve harness connector to the A/C Heater Control Module harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Go to 3
NO: Repair the Recirculated Air Switchover Valve Control circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test




3. MEASURE THE VOLTAGE OF THE RECIRCULATED AIR SWITCHOVER VALVE CONTROL CIRCUIT

Reconnect the Recirculated Air Switchover Valve connector. Turn the ignition on.
Measure the voltage of the Recirculated Air Switchover Valve Control circuit at the A/C Heater Control Module harness connector.

Q: Is the voltage above 10 volts?

YES: Replace the A/C Heater Control Module. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Replace the Recirculated Air Switchover Valve. Perform BODY VERIFICATION TEST. Body Verification Test