Is there continuity?
Repair a short in the wires between the climate control unit and the front evaporator temperature sensor.?
Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit See:
Heating and Air Conditioning/Control Assembly/Service and Repair/Climate Control Unit Removal/Installation.?
H and Mode
DTC Troubleshooting: B1246 (H and MODE)
DTC B1246 or DTC indicator H and MODE:
A Problem in the Rear Air Mix Control Linkage, Door, or Motor Circuit
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Do the self-diagnostic function with the HDS or the climate control unit.
4. Check for DTCs.
Is DTC B1246 or H and MODE indicated?
Go to step 5.
Intermittent failure, check for loose wires or poor connections in the rear air mix control motor circuit.?
5. Turn the ignition switch to LOCK (0).
6. Test the rear air mix control motor See: Heating and Air Conditioning/Testing and Inspection/Component Tests and General
Diagnostics/Rear Air Mix Control Motor Test.
Is the rear air mix control motor OK?
Go to step 7.
Replace the rear air mix control motor See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/Rear Air Mix
Control Motor Replacement, or repair the rear air mix control linkage or door.?
7. Disconnect the rear air mix control motor 7P connector.
8. Disconnect climate control unit connector B (14P).
9. Check for continuity between the following terminals of climate control unit connector B (14P) and the rear air mix control motor 7P