Dodge Ram Truck 1500-2500-3500. Manual — part 2031
ZONE CALIBRATION FAULT (CONTINUED)
4.
CHECK (C61) BLEND DOOR DRIVER CIRCUIT FOR AN OPEN
Disconnect the Driver Blend Door Actuator harness connector.
Measure the resistance of the (C61) Blend Door Driver circuit between
the A/C Heater Control C1 harness connector and the Driver Blend
Door Actuator harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the (C61) Blend Door Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT
CONTROL
MODULE
-
DIAGNOSIS
AND
TESTING).
5.
CHECK (C34) COMMON DOOR DRIVER CIRCUIT FOR AN OPEN
Measure the resistance of the (C34) Common Door Driver circuit
between the A/C Heater Control C1 harness connector and the Driver
Blend Door Actuator harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Driver Blend Door Actuator in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Repair the (C34) Common Door Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT
CONTROL
MODULE
-
DIAGNOSIS
AND
TESTING).
24 - 124
HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
ZONE CALIBRATION FAULT (CONTINUED)
6.
CHECK FOR A BROKEN DRIVER BLEND DOOR ACTUATOR
Remove the Driver Blend Door Actuator from the A/C Heater Housing Assembly.
Disconnect the Driver Blend Door Actuator harness connector.
By hand, attempt to rotate the actuator in both directions.
Does the actuator turn in either direction?
Yes
>> Replace the Driver Blend Door Actuator in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Go To 7
7.
CHECK FOR MISSING & BROKEN ACTUATOR LINKAGE & THE DOOR FOR BINDING & A LOSS OF
RANGE
Inspect the A/C Heater Housing Assembly for missing and broken actuator linkage.
Inspect the linkage and the actuator for broken and missing teeth.
Check the door for binding and a loss of full range.
Are there any physical or mechanical problems with the door, actuator, linkage, or housing?
Yes
>> Repair as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
DR/DH
HVAC - ELECTRICAL DIAGNOSTICS
24 - 125
ZONE CIRCUIT SHORTED TO GROUND
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
When the Actuator Circuit Test is executed.
•
Set Condition:
If the A/C Heater Control detects a short to ground on the (C61) Driver Blend Door Driver circuit (dual-zone).
Possible Causes
DOOR DRIVER CIRCUIT(S) SHORTED TO GROUND
DOOR DRIVER CIRCUITS SHORTED TOGETHER
DOOR ACTUATOR(S)
A/C HEATER CONTROL
Refer to *ACTUATOR CIRCUIT TEST DIAGNOSTICS (DUAL-ZONE) in this Section for the diagnostic test pro-
cedure.
24 - 126
HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
ZONE CIRCUIT SHORTED TO IGN OR BATT
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
When the Actuator Circuit Test is executed.
•
Set Condition:
If the A/C Heater Control detects a short to voltage on the (C61) Driver Blend Door Driver circuit (dual-zone).
Possible Causes
DOOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
DOOR DRIVER CIRCUITS SHORTED TOGETHER
DOOR ACTUATOR(S)
A/C HEATER CONTROL
Refer to *ACTUATOR CIRCUIT TEST DIAGNOSTICS (DUAL-ZONE) in this Section for the diagnostic test pro-
cedure.
DR/DH
HVAC - ELECTRICAL DIAGNOSTICS
24 - 127
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