B102D
B102D - Rear Blend Door Control Circuit/Performance
For a complete wiring diagram refer to.
Theory of Operation
The A/C heater control drives the rear blend door actuator with the rear blend door driver circuit and the common door driver circuit. The A/C heater control drives the rear mode door actuator with the rear mode door driver circuit and the common door driver circuit. Due to the shared circuitry, similar DTCs can set at the same time for multiple actuators depending on the type of short its location and the direction the actuator is moving when the short is present.
• When Monitored: With the ignition on.
• Set Condition: If the A/C heater control detects a short on the rear mode door driver circuit, the rear blend door driver circuit, or the rear common door driver circuit while attempting to drive the rear mode door actuator or the rear blend door actuator.
• 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 Rear Mode Door Driver Circuit, Rear Blend Door Driver Circuit, and Rear Blend 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 rear mode door driver circuit in the A/C heater control C1 harness connector.
• Measure the voltage of the rear blend door driver circuit in the A/C heater control C1 harness connector.
• Measure the voltage of the rear common door driver circuit in the A/C heater control C1 harness connector.
Is the voltage more than 0.2 volts on any of the circuits?
Yes
• Repair the circuits with voltage more than 0.2 volts for a short to voltage.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
No
• Go to Test Step 2 => [ Test Step 2 - Check Rear Mode Door Driver Circuit, Rear Blend Door
Driver Circuit, and Common Door Driver Circuit for a Short to Ground ]
Test Step 2 - Check Rear Mode Door Driver Circuit, Rear Blend Door Driver Circuit, and Common Door Driver Circuit for a Short to Ground
• Turn the ignition OFF.
• Measure the resistance between ground and the rear mode door driver circuit in the A/C heater control C1 harness connector.
• Measure the resistance between ground and the rear blend door driver circuit in the A/C heater control C1 harness connector.
• Measure the resistance between ground and the common door driver circuit in the A/C heater control C1 harness connector.
Is the resistance less than 10k ohms on any of the circuits?
Yes
• Repair the circuits with a resistance less than 10k ohms for a short to ground.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
No
• Go to Test Step 3 => [ Test Step 3 - Check Rear Mode Door Driver Circuit for a Short to
Other Door Driver Circuit ]
Test Step 3 - Check Rear Mode Door Driver Circuit for a Short to Other Door Driver Circuit
• Measure the resistance between the rear mode door driver circuit and the rear blend door driver circuit, and the common door driver circuit in the A/C heater control C1 harness connector.
Is the resistance less than 100 ohms between any of the circuits?
Yes
• Repair the circuits with a resistance less than 100 ohms for a short together.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
No
• Go to Test Step 4 => [ Test Step 4 - Check Rear Mode Door Actuator Circuit Resistance ]
Test Step 4 - Check Rear Mode Door Actuator Circuit Resistance
• Measure the resistance between the rear mode door driver circuit and the rear common door driver circuit in the A/C heater control C1 harness connector.
Is the resistance between 30 and 40 ohms?
Yes
• Go to Test Step 5 => [ Test Step 5 - Check Rear Blend Door Actuator Circuit Resistance ]
No
• Replace the rear mode door actuator.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 5 - Check Rear Blend Door Actuator Circuit Resistance
• Measure the resistance between the rear blend door driver circuit and the rear common door driver circuit in the A/C heater control C1 harness connector.
Is the resistance between 30 and 40 ohms?
Yes
• Go to Test Step 6 => [ Test Step 6 - Run the Actuator Calibration Test ]
No
• Replace the rear blend door actuator.
• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test
Test Step 6 - 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 B102D - Rear Blend 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.
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