Operation CHARM: Car repair manuals for everyone.
Home >> Dodge or Ram Truck >> 2012 >> Durango 2WD V6-3.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B1027 >> B1027-11

B1027-11






B1027-11-REAR CONTROL HEAD BLOWER REQUEST INPUT - CIRCUIT SHORT TO GROUND





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Rear A/C Heater Control works in conjunction with the A/C Heater Control to control the rear blower motor, rear temperature control and rear mode control. The Rear A/C Heater Control is constantly monitored by the A/C Heater Control for proper operation. If the monitored signal circuits are out of a calibrated range a DTC will set. For further information Description and Operation.

- When Monitored:
With the ignition on.

- Set Condition:
If the A/C Heater Control detects a short to ground on the Rear Blower Signal circuit. If a valid amperage draw is detected, the DTC will change from active to stored and stay in the controllers memory for 100 consecutive ignition cycles.





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. HVAC Pre-Diagnostic Troubleshooting Procedure.

1. VERIFY THE DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, erase HVAC DTCs.
3. Turn the ignition off, wait 10 seconds, and turn the ignition on. NOTE: Make sure the Rear Control Lockout on the A/C Heater Control is not turned on.

4. With the scan tool, read HVAC DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- Go To 9

2. CHECK FOR OTHER REQUEST CIRCUIT LOW DTCS
1. With the scan tool, read HVAC DTCs.

Does the scan tool also display the any other HVAC rear control short to ground DTCs?

Yes

- Go To 3

No

- Go To 6

3. CHECK THE REAR A/C HEATER CONTROL CONNECTOR
1. Check if the Rear A/C Heater Control harness connector is unplugged or not fully seated.
2. Check the Rear A/C Heater Control and harness connector for pushed out, damaged, corroded pins or terminals.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 4

4. CHECK THE (C800) 5 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off to the lock position.
2. Disconnect the A/C Heater Control C2 harness connector.
3. Disconnect the Rear A/C Heater Control harness connector.
4. Measure the resistance between ground and the (C800) 5 Volt Supply circuit.

Is the resistance below 100k Ohms?

Yes

- Repair the (C800) 5 Volt Supply circuit for a short to ground
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 5

5. CHECK THE (C800) 5 VOLT SUPPLY CIRCUIT FOR AN OPEN




1. Measure the resistance of the (C800) 5 Volt Supply circuit between A/C Heater Control C2 harness connector and the Rear A/C Heater Control harness connector.

Is the resistance below 1.0 Ohm?

Yes

- Go To 8

No

- Repair the (C800) 5 Volt Supply circuit for an open or high resistance.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

6. CHECK THE (C11) REAR BLOWER SIGNAL CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off to the lock position.
2. Disconnect the A/C Heater Control C2 harness connector.
3. Disconnect the Rear A/C Heater Control harness connector.
4. Measure the resistance between ground and the (C11) Rear Blower Signal circuit.

Is the resistance below 100k Ohms?

Yes

- Repair the (C11) Rear Blower Control Signal circuit for a short to ground.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 7

7. CHECK THE (C11) REAR BLOWER SIGNAL CIRCUIT FOR AN OPEN




1. Measure the resistance of the (C11) Rear Blower Signal circuit between A/C Heater Control C2 harness connector and the Rear A/C Heater Control harness connector.

Is the resistance below 1.0 Ohm?

Yes

- Go To 8

No

- Repair the (C11) Rear Blower Signal circuit for an open or high resistance.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

8. CHECK THE HVAC CONTROL MODULES




1. Reconnect the A/C Heater Control C2 harness connector.
2. Ignition on, engine not running.
3. With the scan tool, erase HVAC DTCs.
4. Turn the ignition off to the lock position.
5. Connect a jumper wire between the (C800) 5-volt Supply circuit and the (C11) Rear Blower Signal circuit in the Rear A/C Heater Control C1 harness connector.
6. Ignition on, engine not running.
7. After waiting a minimum of 30 seconds, with the scan tool, read HVAC DTCs.

Does the scan tool display this DTC as active?

Yes

- Replace and program the A/C Heater Control. A/C And Heater Control - Removal.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Replace the Rear A/C Heater Control. A/C And Heater Control - Removal.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

9. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. Wiggle the wiring and connectors while checking for shorted and open circuits.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Test complete.

pro multis · About Operation CHARM