Recirculation Control Motor Circuit Troubleshooting (With A/C)
Recirculation Control Motor Circuit Troubleshooting
1. Check the No. 20 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES - Go to step 2.
NO - Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 20 (7.5 A) fuse circuit.
2. Disconnect the recirculation control motor 7P connector.
3. Turn the ignition switch to ON (II).
4. Measure the voltage between recirculation control motor 7P connector terminal No. 1 and body ground.
Is there battery voltage?
YES - Go to step 5.
NO - Repair open in the wire between the No. 20 (7.5 A) fuse in the under-dash fuse/relay box and the recirculation control motor.
5. Turn the ignition switch to LOCK (0).
6. Test the recirculation control motor. Recirculation Control Motor Test
Is the recirculation control motor OK?
YES - Go to step 7.
NO - Go to step 11.
7. Disconnect the HVAC control unit 30P connector.
8. Check for continuity between HVAC control unit 30P connector terminals No. 15 and No. 16 and body ground individually.
Is there continuity?
YES - Repair short to body ground in the wire(s) between the HVAC control unit and the recirculation control motor.
NO - Go to step 9.
9. Turn the ignition switch to ON (II), and measure the voltage between the same terminals and body ground.
Is there any voltage?
YES - Repair short to power in the wire(s) between the HVAC control unit and the recirculation control motor. This short may also damage the HVAC control unit . Repair the short to power before replacing the HVAC control unit.
NO - Go to step 10.
10. Turn the ignition switch to LOCK (0), and check for continuity between the following terminals of the HVAC control unit 30P connector and the recirculation control motor 7P connector.
Is there continuity?
YES - Check for loose wires or poor connections at the HVAC control unit 30P connector, and at the recirculation control motor 7P connector. If the connections are good, substitute a known-good HVAC control unit , and recheck. If the symptom/indication goes away, replace the original HVAC control unit.
NO - Repair open in the wire(s) between the HVAC control unit and the recirculation control motor.
11. Remove the recirculation control motor. Recirculation Control Motor Replacement
12. Check the recirculation control linkage and doors for smooth movement.
Do the recirculation control linkage and doors move smoothly?
YES - Replace the recirculation control motor.
NO - Repair the recirculation control linkage or doors.