ATC

B1029-REAR BLOWER CONTROL REQUEST INPUT HIGH (ATC)





For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .


- When Monitored:
With the ignition on.

- Set Condition:
If low and high Rear Blower speeds are requested simultaneously.







NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures. Heating-A/C System Diagnostics


Diagnostic Test


1. CHECK THE (C11) REAR BLOWER FEED SENSE CIRCUIT FOR A SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Disconnect the Rear Blower Control Switch 8 way harness connector.
Turn the ignition on.
Measure the voltage of the (C11) Rear Blower Feed Sense circuit in the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is the voltage above 0.2 volts?

Yes


- Repair the (C11) Rear Blower Feed Sense circuit for a short to voltage.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 2


2. CHECK (C800) REAR BLEND SENSE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE




Measure the voltage of the (C800) Rear Blend Sense Supply circuit in the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is the voltage above 6 volts?

Yes


- Repair the (C800) Rear Blend Sense Supply circuit for a short to voltage.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 3


3. CHECK THE (C11) REAR BLOWER FEED SENSE CIRCUIT FOR A SHORT TO (C800) REAR BLEND SENSE SUPPLY CIRCUIT




Turn the ignition off.
Measure the resistance between the (C11) Rear Blower Feed Sense circuit and the (C800) Rear Blend Sense Supply circuit in the A/C Heater Control (3 ZONE ATC) 32 way harness connector.
Is the resistance below 10k ohms?

Yes


- Repair the (C11) Rear Blower Feed Sense circuit for a short to the (C800) Rear Blend Sense Supply circuit.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 4


4. CHECK FOR DTC WITH REAR A/C HEATER CONTROL SWITCH DISCONNECTED
Reconnect the A/C Heater Control (3 ZONE ATC) 32 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.
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 HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Replace the Rear Blower Control Switch.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.