Manual Temperature Control
B10A2 - Left Blend Door Control Circuit/Performance
For a complete wiring diagram, refer to.
Theory of Operation
The A/C heater control monitors the door driver circuits during actuator operation for shorts to ground, shorts to battery, and shorts to other door driver circuits. If detected, the A/C heater control reports these types of faults as control circuit/performance DTCs.
• When Monitored: When actuator movement is requested.
• Set Condition: If the A/C heater control detects a short to ground or to voltage on the recirculation door driver, the passenger blend door driver, the driver blend door driver, the mode door driver, or the common door driver 2 circuits while attempting to drive the recirculation door driver.
• The DTC must be active for the results of this test to be valid. Do not perform this test if the DTC is stored. Refer to => Non-DTC Based Diagnostics for stored DTC test procedures.
Test Step 1 - Check Recirculation Door Driver Circuit for a Short to Voltage
• Turn the ignition OFF.
• Disconnect the A/C heater control C1 harness connector.
• Turn the ignition ON.
• Measure the voltage of the recirculation door driver circuit in the A/C heater control C1 harness connector.
Is the voltage less than 0.2 volts?
Yes
• Go to Test Step 2 => [ Test Step 2 - Check Passenger Blend Door Driver Circuit for a Short
to Voltage ]
No
• Repair the recirculation door driver circuit for a short to voltage.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 2 - Check Passenger Blend Door Driver Circuit for a Short to Voltage
• Measure the voltage of the passenger blend door driver circuit in the A/C heater control C1 harness connector.
Is the voltage less than 0.2 volts?
Yes
• Go to Test Step 3 => [ Test Step 3 - Check Mode Door Driver Circuit for a Short to Voltage ]
No
• Repair the passenger blend door driver circuit for a short to voltage.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 3 - Check Mode Door Driver Circuit for a Short to Voltage
• Measure the voltage of the mode door driver circuit in the A/C heater control C1 harness connector.
Is the voltage less than 0.2 volts?
Yes
• Go to Test Step 4 => [ Test Step 4 - Check Driver Blend Door Driver Circuit for a Short
to Voltage ].
No
• Repair the mode door driver circuit for a short to voltage.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 4 - Check Driver Blend Door Driver Circuit for a Short to Voltage
• Measure the voltage of the driver blend door driver circuit in the A/C heater control C1 harness connector.
Is the voltage less than 0.2 volts?
Yes
• Go to Test Step 5 => [ Test Step 5 - Check Common Door Driver 2 Circuit for a Short to Voltage ]
No
• Repair the driver blend door driver circuit for a short to voltage.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 5 - Check Common Door Driver 2 Circuit for a Short to Voltage
• Measure the voltage of the common door driver 2 circuit in the A/C heater control C1 harness connector.
Is the voltage less than 0.2 volts?
Yes
• Go to Test Step 6 => [ Test Step 6 - Check Recirculation Door Driver Circuit for a Short
to Ground ]
No
• Repair the common door driver 2 circuit for a short to voltage.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 6 - Check Recirculation Door Driver Circuit for a Short to Ground
• Turn the ignition OFF.
• Measure the resistance between ground and the recirculation door driver circuit in the A/C heater control C1 harness connector.
Is the resistance more than 10k ohms?
Yes
• Go to Test Step 7 => [ Test Step 7 - Check Passenger Blend Door Driver Circuit for a Short
to Ground ]
No
• Repair the recirculation door driver circuit for a short to ground.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 7 - Check Passenger Blend Door Driver Circuit for a Short to Ground
• Measure the resistance between ground and the passenger blend door driver circuit in the A/C heater control C1 harness connector.
Is the resistance more than 10k ohms?
Yes
• Go to Test Step 8 => [ Test Step 8 - Check Driver Blend Door Driver Circuit for a Short
to Ground ]
No
• Repair the passenger blend door driver circuit for a short to ground.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 8 - Check Driver Blend Door Driver Circuit for a Short to Ground
• Measure the resistance between ground and the driver blend door driver circuit in the A/C heater control C1 harness connector.
Is the resistance more than 10k ohms?
Yes
• Go to Test Step 9 => [ Test Step 9 - Check Mode Door Driver Circuit for a Short to Ground ]
No
• Repair the driver blend door driver circuit for a short to ground.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 9 - Check Mode Door Driver Circuit for a Short to Ground
• Measure the resistance between ground and the mode door driver circuit in the A/C heater control C1 harness connector.
Is the resistance more than 10k ohms?
Yes
• Go to Test Step 10 => [ Test Step 10 - Check Common Door Driver 2 Circuit for a Short to
Ground ]
No
• Repair the Mode door driver circuit for a short to ground.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 10 - Check Common Door Driver 2 Circuit for a Short to Ground
• Measure the resistance between ground and the common door driver 2 circuit in the A/C heater control C1 harness connector.
Is the resistance more than 10k ohms?
Yes
• Go to Test Step 11 => [ Test Step 11 - Check Recirculation Door Driver Circuit for a Short
to Other Door Driver Circuits ]
No
• Repair the common door driver 2 circuit for a short to ground.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 11 - Check Recirculation Door Driver Circuit for a Short to Other Door Driver Circuits
• Measure the resistance between the recirculation door driver circuit and the passenger blend door driver circuit, driver blend door driver circuit, the common door driver 2 circuit, and the mode door driver circuit in the A/C heater control C1 harness connector.
Is the resistance more than 100 ohms between the recirculation door driver circuit and all door driver circuits?
Yes
• Go to Test Step 12 => [ Test Step 12 - Check Recirculation Door Actuator Circuit Resistance ]
No
• Repair the circuits with a resistance less than 100 ohms for a short to the recirculation door driver circuit.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 12 - Check Recirculation Door Actuator Circuit Resistance
• Measure the resistance between the recirculation door driver circuit and the common door driver 2 circuit in the A/C heater control C1 harness connector.
Is the resistance between 30 and 40 ohms?
Yes
• Go to Test Step 13 => [ Test Step 13 - Check Passenger Blend Door Actuator Circuit Resistance ]
No
• Replace the recirculation door actuator.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 13 - Check Passenger Blend Door Actuator Circuit Resistance
• Measure the resistance between the passenger blend door driver circuit and the common door driver 2 circuit in the A/C heater control C1 harness connector.
Is the resistance between 30 and 40 ohms?
Yes
• Go to Test Step 14 => [ Test Step 14 - Check Mode Door Actuator Circuit Resistance ]
No
• Replace the passenger door actuator.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 14 - Check Mode Door Actuator Circuit Resistance
• Measure the resistance between the mode door driver circuit and the common door driver 2 circuit in the A/C heater control C1 harness connector.
Is the resistance between 30 and 40 ohms?
Yes
• Go to Test Step 15 => [ Test Step 15 - Check Driver Blend Door Actuator Circuit Resistance ]
No
• Replace the mode door actuator.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 15 - Check Driver Blend Door Actuator Circuit Resistance
• Measure the resistance between the driver blend door driver circuit and the common door driver 2 circuit in the A/C heater control C1 harness connector.
Is the resistance between 30 and 40 ohms?
Yes
• Go to Test Step 16 => [ Test Step 16 - Run the Actuator Calibration Test ]
No
• Replace the mode door actuator.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 16 - Run the Actuator Calibration Test
• Reconnect the A/C heater control C1 harness connector.
• Turn the ignition ON.
• With the scan tool, erase HVAC DTCs.
• Turn the ignition OFF, wait 10 seconds, and then turn the ignition ON.
• With the scan tool, select system tests and then select actuator calibration test. When the test is complete, select view DTCs.
Does the scan tool only display B1058 - Recirculation Door Control Circuit/Performance?
Yes
• Replace the A/C heater control.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
No, Other DTCs Displayed
• Diagnose and repair the other DTCs. Refer to the table of contents in this section for a complete list of all HVAC related symptoms.
No, and No Other DTCs Displayed
• Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short. Repair as necessary.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test