DTC 3

DTC 3: A Problem in the Mode Control Motor Circuit

1. Disconnect the mode control motor 7P connector.
2. Disconnect the heater control panel 30P connector.




3. Check for continuity between body ground and the heater control panel 30P connector terminals No. 8, 9, 15, 16, 17, 18 and 27 individually.

Is there continuity?

YES - Repair any short to body ground in the wire(s) between the heater control panel and the mode control motor.

NO - Go to step 4.




4. Turn the ignition switch ON (II), and check the same terminals for voltage.

Is there any voltage?

YES - Repair any short to power in the wire(s) between the heater control panel and the mode control motor. This short may also damage the heater control panel. Repair the short to power before replacing the heater control panel.

NO - Go to step 5.

5. Turn the ignition switch OFF.




6. Check for continuity between following terminals of the heater control panel 30P connector and the air mix control motor 7P connector.
30P: 7P:
No. 8 No. 1
No. 9 No. 2
No. 15 No. 3
No. 16 No. 4
No. 17 No. 5
No. 18 No. 6
No. 27 No. 7

Is there continuity?

YES - Go to step 7.

NO - Repair any open in the wire(s) between the heater control panel and mode control motor.

7. Test the mode control motor.

Is the mode control motor OK?

YES - Check for loose wires or poor connections at the heater control panel connector (30P) and at mode control motor 7P connector. If the connections are good, substitute a known-good mode control motor and recheck. If the symptom/ indication goes away, replace the original mode control motor. If the symptom/indication continues, substitute a known-good heater control panel, and recheck. If the symptom/indication goes away, replace the original heater control panel.

NO - Replace the mode control motor.