Manual Temperature Control

B1029 - Rear Blower Control Request Input High






For a complete wiring diagram, refer to.

• When Monitored: With the ignition on.

• Set Condition: If low and high rear blower speeds are requested simultaneously.






• This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored.

Test Step 1 - Check the Rear Blower Feed Sense Circuit for a Short to Voltage






• Turn the ignition OFF.

• Disconnect the A/C heater control C2 harness connector.

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

• Turn the ignition ON.

• Measure the voltage of the rear blower feed sense circuit in the A/C heater control C2 harness connector.

Is the voltage more than 0.2 volts?

Yes

• Repair the rear blower feed sense 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 Rear Blend Sense Supply Circuit for a Short to
Voltage ]

Test Step 2 - Check Rear Blend Sense Supply Circuit for a Short to Voltage






• Measure the voltage of the rear blend sense supply circuit in the A/C heater control C2 harness connector.

Is the voltage more than 6 volts?

Yes

• Repair the rear blend sense supply 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 3 => [ Test Step 3 - Check the Rear Blower Feed Sense Circuit for a Short
to Rear Blend Sense Supply Circuit ]

Test Step 3 - Check the Rear Blower Feed Sense Circuit for a Short to Rear Blend Sense Supply Circuit






• Turn the ignition OFF.

• Measure the resistance between the rear blower feed sense circuit and the rear blend sense supply circuit in the A/C heater control C2 harness connector.

Is the resistance less than 10k ohms?

Yes

• Repair the rear blower feed sense circuit for a short to the rear blend sense supply circuit.

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

No

• Go to Test Step 4 => [ Test Step 4 - Check for DTC with Rear A/C Heater Control Switch Disconnected ]

Test Step 4 - Check for DTC with Rear A/C Heater Control Switch Disconnected

• Reconnect the A/C heater control C2 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.

• Set the rear function mode switch to control in rear.

• With the scan tool, read HVAC DTCs.

Does the scan tool display this DTC as active?

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 blower control switch.

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