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Rear Blend Pot Circuit Open (Active)

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the ignition off. Disconnect the Rear Blower Rear Control Switch C2 harness connector. See Figure. Turn the ignition on. Measure the voltage of the 5 Volt Supply circuit. If the voltage is more than 5.3 volts, repair the 5 Volt Supply circuit for a short to voltage. If the voltage is less than 5.3 volts, go to the next step.
  2. Turn the ignition off. Disconnect the Rear Blower Rear Control Switch C2 harness connector. See Figure. Turn the ignition on. Measure the voltage of the Rear Temperature Feedback Signal circuit. If voltage is more than 5.1 Volts, repair the Rear Temperature Feedback Signal circuit for a short to voltage. If voltage is less than 0.25 volts, go to the next step. If voltage is between 0.25 & 5.1 volts, go to step  4.
  3. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. See Figure. Disconnect the Rear Blower Rear Control Switch C2 harness connector. See Figure. Measure the resistance of the Rear Temperature Feedback Signal 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, replace the A/C-Heater Control Module. See A/C-HEATER CONTROL PANEL  under REMOVAL & INSTALLATION. If the resistance is more than 5 ohms, repair the Rear Temperature Feedback Signal 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 the 5 Volt Supply circuit 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 5 volt Supply circuit for a short to the Rear Temperature Feedback Signal circuit.
  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 of the Rear Temperature Return 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 Rear Temperature Return circuit for an open.
  6. Turn the ignition off. Disconnect the A/C-Heater Control Module C1 harness connector. See Figure. Make sure that the Rear Blower Rear Control Switch C2 harness connector is connected to the Rear Blower Rear Control Switch. Measure the resistance of the Rear Blower Rear Control Switch Rear Blend Potentiometer as follows: Turn the Rear Blend knob to full hot. Measure the resistance between the 5 Volt Supply circuit and the Rear Temperature Feedback Signal circuit at the A/C-Heater Control Module C1 harness connector. The resistance should be approximately 800 ohms. Slowly rotate the Rear Blend knob from full hot to full cold while viewing the DVOM. The reading should change fluidly from approximately 800 to 10.5K ohms. Turn the Rear Blend knob to full hot. Measure the resistance between the 5 Volt Supply circuit and the Rear Temperature Return circuit at the A/C-Heater Control Module C1 harness connector. The resistance should be approximately 10.9K ohms. Slowly rotate the Rear Blend knob from full hot to full cold while viewing the DVOM. The reading should stay steady at approximately 10.9K ohms. Turn the Rear Blend knob to full hot. Measure the resistance between the Rear Temperature Return circuit and the Rear Temperature Feedback Signal circuit at the A/C-Heater Control Module C1 harness connector. The resistance should be approximately 10.2K ohms. Slowly rotate the Rear Blend knob from full hot to full cold while viewing the DVOM. The reading should change fluidly from approximately 10.2K to 800 ohms. If all of the resistance measurements as specified, replace the A/C-Heater Control Module. See A/C-HEATER CONTROL PANEL  under REMOVAL & INSTALLATION. If the resistance measurements are not as specified, 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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