HVAC Control Unit

Control System DTCs

HVAC DTC Troubleshooting: 1

DTC indicator 1 : An Open in the Air Mix Control Motor Circuit

1. Problem verification:

Problem verification
-1. Turn the ignition switch to LOCK (0), and then back to ON (II).

-2. Do the Self-Diagnostic Function with the HVAC control unit How to Troubleshoot the Heating and A/C Systems (Manual A/C).

-3. Check for DTCs.

Is DTC 1 indicated?
-YES- Go to step 2.
-NO- Intermittent failure. Check for loose wires or poor connections on the air mix control motor circuit.

2. Open wire check (AMD-P, S_5V/S5V, SENSOR_COM/SENS-COM lines):

Open wire check (AMD-P, S_5V/S5V, SENSOR_COM/SENS-COM lines)
-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connectors.





-3. Check for continuity between test points 1 and 2 respectively.



































Is there continuity?
-YES- The AMD-P, S_5V/S5V, and SENSOR_COM/SENS-COM wires are OK. Go to step 3.
-NO- Repair an open in the wire(s) between the HVAC control unit and the air mix control motor.

3. Air mix control motor check:

Air mix control motor check
-1. Test the air mix control motor Air Mix Control Motor Test.

Is the air mix control motor OK?
-YES- Replace the HVAC control unit HVAC Control Unit Removal and Installation (With Navigation).
-NO- Replace the air mix control motor Air Mix Control Motor Removal and Installation.