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Rear Blend Pot Circuit Short (Active)

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. Disconnect the Rear Blower Rear Control Switch C2 harness connector. See Figure. Measure the resistance between ground and the 5 Volt Supply circuit. If the resistance is more than 100K ohms, go to the next step. If the resistance is less than 100K ohms, repair the 5 Volt Supply circuit for a short to ground.
  2. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. Disconnect the Rear Blower Rear Control Switch C2 harness connector. See Figure. Measure the resistance between the 5 Volt Supply circuit and the Rear Temperature Return circuit. If the resistance is more than 100K ohms, go to the next step. If the resistance is less than 100K ohms, repair the 5 Volt Supply circuit for a short to the Rear Temperature Return circuit.
  3. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. Disconnect the Rear Blower Rear Control Switch C2 harness connector. See Figure. Measure the resistance of the 5 Volt Supply circuit between the A/C-Heater Control Module C1 harness connector and the Rear Blower Rear Control Switch C2 harness connector. If the resistance is less than 5 ohms, go to the next step. If the resistance is more than 5 ohms, repair the 5 Volt Supply circuit for an open.
  4. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. Disconnect the Rear Blower Rear Control Switch C2 harness connector. See Figure. Measure the resistance between ground and the Rear Temperature Feedback Signal circuit. If the resistance is more than 100K ohms, go to the next step. If the resistance is less than 100K ohms, repair the Rear Temperature Feedback Signal circuit for a short to ground.
  5. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. Disconnect the Rear Blower Rear Control Switch C2 harness connector. See Figure. Measure the resistance between the Rear Temperature Feedback Signal circuit and the Rear Temperature Return circuit. If the resistance is more than 100K ohms, go to the next step. If the resistance is less than 100K ohms, repair the Rear Temperature Feedback Signal circuit for a short to the Rear Temperature Return circuit.
  6. Turn the ignition off. Make sure that the A/C-Heater Control Module C1 harness connector is connected to the A/C-Heater Control Module. Disconnect the Rear Blower Rear Control Switch C2 harness connector. Turn the ignition on. With the DRBIII®, read active HVAC DTCs. If the DRBIII® displays: Rear Blend Pot Circuit Short, replace the A/C-Heater Control Module. See A/C-HEATER CONTROL PANEL  under REMOVAL & INSTALLATION. If the DRBIII® does not display: Rear Blend Pot Circuit Short, replace the Rear Blower Rear Control Switch. See HVAC CONTROLS (REAR) under REMOVAL & INSTALLATION in MANUAL A/C-HEATER SYSTEMS article in HVAC.
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