Manual Temperature Control

B103A - Rear Mode Door Control Circuit/Performance

For a complete wiring diagram, refer to.






Theory of Operation

The A/C heater control drives the rear mode door actuator with the rear mode door driver circuit and the common door driver circuit. The A/C heater control drives the rear blend door actuator with the rear blend 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, or the rear common door driver circuit while attempting to drive the rear mode 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 the Rear Mode Door Driver Circuit, and the Rear Common Door Driver Circuit for a Short to Voltage






• Turn the ignition OFF.

• Disconnect the A/C heater control C1 (3 ZONE MTC) 16 way harness connector.

• Turn the ignition ON.

• Measure the voltage of the rear mode door driver circuit in the A/C heater control C1 (3 ZONE MTC) 16 way harness connector.

• Measure the voltage of the rear common door driver circuit in the A/C heater control C1 (3 ZONE MTC) 16 way harness connector.

Does the volt meter display any voltage?

Yes

• Repair the C34 rear common door driver circuit, or the rear mode door driver circuit 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 the Rear Mode Door Driver Circuit, Rear Common
Door Driver Circuit for a Short to Ground ]

Test Step 2 - Check the Rear Mode Door Driver Circuit, Rear 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 (3 ZONE MTC) 16 way harness connector.

• Measure the resistance between ground and the rear common door driver circuit in the A/C heater control C1 (3 ZONE MTC) 16 way harness connector.

Does the ohm meter read open circuit?

Yes

• Go to Test Step 3 => [ Test Step 3 - Check Rear Mode Door Actuator Circuit Resistance ]

No

• Repair the circuits that is not open for a short to ground.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

Test Step 3 - 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 (3 ZONE MTC) 16 way harness connector.

Is the resistance between 30 and 40 ohms?

Yes

• Replace the A/C heater control.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Replace the rear mode door actuator.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test