Manual Temperature Control

B113D - Rear Mode Request Low

For a complete wiring diagram, refer to.

Theory of Operation

When the rear A/C heater control is used to adjust the rear mode door actuator, the A/C heater control receives a rear mode request signal via the rear mode door driver circuit. The A/C heater control drives the rear mode door actuator via the rear mode door driver circuit and the common door driver circuit.

• When Monitored: With the ignition on.

• Set Condition: If the A/C heater control detects a short to ground or an open on the rear mode door driver circuit when the rear A/C heater control is used to adjust 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 for an Active DTC with Rear A/C Heater Control Disconnected

• Turn the ignition OFF.

• Disconnect the rear A/C heater control 8 way harness connector.

• Connect a jumper wire between the rear mode door driver circuit and the rear blower control 5 volt source circuit in the rear A/C heater control 8 way 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, read HVAC DTCs.

Does the scan tool display this DTC as active?

Yes

• Go to Test Step 2 => [ Test Step 2 - Check Rear Mode Door Driver Circuit for a Short to
Ground ]

No

Replace the A/C heater control.

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

Test Step 2 - Check Rear Mode 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 rear A/C heater control 8 way harness connector.

Is the resistance more than 10k ohms?

Yes

• Repair the rear mode door driver circuit 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 an Open ]

Test Step 3 - Check Rear Mode Door Driver Circuit for an Open

• Disconnect the A/C heater control harness C1 connector.

• Measure the resistance of the rear mode door driver circuit between the rear A/C heater control 8 way harness connector and the A/C heater control C1 harness connector.

Is the resistance less than 5 ohms?

Yes

• Replace the A/C heater control.

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

No

• Repair the rear mode door driver circuit for an open.

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