Rear Blend Pot Circuit Shorted (Active)

When Monitored:

With ignition on.

Set Condition:

This DTC will set if the A/C-Heater Control Module sees voltage less than 0.23 volt on the Rear Temperature Sensor Signal circuit.

Possible Causes:

Rear A/C-Heater Control Module.
5-Volt Supply circuit shorted to Sensor Return circuit.
5-Volt Supply circuit shorted to ground.
Rear Temperature Sensor Signal circuit shorted to ground.
Rear Temperature Sensor Signal circuit shorted Sensor Return circuit.
5-Volt Supply circuit open.
A/C-Heater Control Module.

CAUTION: Always turn ignition off before disconnecting or connecting any control module connector. Failure to do so could result in damage to control module.

NOTE: Ensure vehicle being tested has a fully charged battery. If it does not, false DTCs or error messages may occur.

NOTE: For component location, see appropriate illustration under COMPONENT LOCATIONS . For terminal identification, see appropriate illustration under CONNECTOR IDENTIFICATION . For circuit and wire color identification, see WIRING DIAGRAMS . For component removal and installation procedures, see appropriate component under REMOVAL & INSTALLATION .

Testing:

Turn ignition off. Connect DRBIII(R) to DLC. Disconnect the Rear A/C-Heater Control Module harness connector. Turn ignition on. Using DRBIII(R), read active HVAC DTCs. Does this DTC reset? If yes, go to next step. If no, replace Rear A/C-Heater Control Module. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
Turn ignition off. disconnect A/C-Heater Control Module C2 harness connector. Measure resistance between A/C-Heater Control Module C2 harness connector terminals No. 11 and 12. Is resistance more than 10,000 ohms? If yes, go to next step. If no, repair 5-volt Supply circuit for a short to Sensor Return circuit. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
Measure resistance between ground and A/C-Heater Control Module C2 harness connector terminal No. 12. Is resistance more than 10,000 ohms? If yes, go to next step. If no, repair 5-volt supply circuit for a short to ground. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
Measure resistance between ground and A/C-Heater Control Module C2 harness connector terminal No. 9. Is resistance more than 10,000 ohms? If yes, go to next step. If no, repair Rear Temperature Sensor Signal circuit for a short to ground. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
Measure resistance between A/C-Heater Control Module C2 harness connector terminals No. 9 and 11. Is resistance more than 10,000 ohms? If yes, go to next step. If no, repair Rear Temperature Sensor Signal circuit for a short to the Sensor Return circuit. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.
Measure resistance between A/C-Heater Control Module C2 harness connector terminal No. 12 and Rear A/C-Heater Control Module harness connector terminal No. 7. Is resistance less than 5 ohms? If yes, replace A/C-Heater Control Module. Perform BODY VERIFICATION TEST under VERIFICATION TESTS. If no, repair open in 5-volt Supply circuit. Perform BODY VERIFICATION TEST under VERIFICATION TESTS.