1000 - 1999: 1418

1418-00 RIGHT COOLANT CIRCULATION VALVE CIRCUIT





When Monitored and Set Condition

- When Monitored: With the ignition on.
- Set Condition: The A/C Heater Control Module detects an abnormal condition on the Right Coolant Circulation Valve Control circuit.





For a complete HVAC Circuit Diagram, HVAC Schematics and Diagrams.

Diagnostic Test

1. MEASURE COOLANT CIRCULATION VALVE VOLTAGE




NOTE: Inspect Fuse 15 located in the Underhood Accessory Fuse Block. If the fuse is open, repair the cause of the open fuse before continuing.

Turn the ignition off.
Disconnect the Coolant Circulation Valve harness connector.

NOTE: Check connector - Clean/repair as necessary.

Measure the voltage of the Fused B(+) circuit at the Coolant Circulation Valve harness connector.
Is the voltage above 10 volts?

Yes

- Go to 2

No

- Repair the Coolant Circulation Valve Fused B(+) circuit.
- Perform BODY VERIFICATION TEST. Body Verification Test

2. MEASURE THE VOLTAGE OF THE RIGHT COOLANT CIRCULATION VALVE CONTROL CIRCUIT




With the ignition off.
Disconnect the A/C Heater Control Module harness connector.

NOTE: Check connector - Clean/repair as necessary.

Connect a jumper wire between the Right Coolant Circulation Valve terminals in the Coolant Circulation Valve harness connector.
Measure the voltage of the Right Coolant Circulation Valve Control circuit at the A/C Heater Control Module harness connector.
Is the voltage above 10 volts?

Yes

- Go to 3

No

- Repair the Right Coolant Circulation Valve Control circuit for an open.
- Perform BODY VERIFICATION TEST. Body Verification Test

3. MEASURE THE VOLTAGE OF THE RIGHT COOLANT CIRCULATION VALVE CONTROL CIRCUIT




With the ignition off.
Reconnect the Coolant Circulation Valve harness connector.
Measure the voltage of the Right Coolant Circulation Valve Control circuit at the A/C Heater Control Module harness connector.
Is the voltage above 10 volts?

Yes

- Replace the A/C Heater Control Module. Removal
- Perform BODY VERIFICATION TEST. Body Verification Test

No

- Replace the Coolant Circulation Valve. Removal.
- Perform BODY VERIFICATION TEST. Body Verification Test