Dodge Dakota (ND). Manual — part 1269
B1049–FLOOR/DEFROST MODE DOOR CONTROL CIRCUIT OPEN
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HVAC - ELECTRICAL DIAGNOSTICS
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B1049–FLOOR/DEFROST MODE DOOR CONTROL CIRCUIT OPEN (CONTINUED)
For the Manual Temperature Control (MTC) circuit diagram (Refer to 24 - HEATING & AIR CONDITIONING - SCHE-
MATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The A/C Heater Control drives the Mode Door 2 (Floor to Defrost) Actuator via the (C801) Mode Door 2 Driver
circuit and the (C34) Common Door Driver circuit. All of the door actuators share the (C34) Common Door Driver
circuit. Inside the A/C Heater Control, each door actuator has its own unique driver, but all share a single common
door driver circuit. Due to the shared circuitry similar DTCs can set at the same time for multiple actuators depend-
ing upon the location of the open circuit and the direction the actuator is moving when the open is present.
•
When Monitored:
When actuator movement is requested.
•
Set Condition:
If the Mode Door 2 (Floor to Defrost) Actuator’s electrical circuit is open. This DTC has a maturing time of 5
seconds and a de-maturing time of 10 seconds. If the DTC’s status changes from active to stored it will stay
in memory for 100 ignition cycles.
Possible Causes
(C801) MODE DOOR 2 DRIVER CIRCUIT OPEN
(C34) COMMON DOOR DRIVER CIRCUIT OPEN
MODE DOOR 2 (FLOOR TO DEFROST) ACTUATOR
A/C HEATER CONTROL
NOTE: DTC B1049 must be active for the results of this test to be valid. Do not perform this test if DTC
B1049 is stored. Refer to HVAC System Test for stored DTC test procedures.
Diagnostic Test
1.
CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE DTCs
Turn the ignition on.
With the scan tool, read active HVAC DTCs.
Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE DTCs?
Yes
>> Diagnose and repair the DTC(s). Refer to the Table of Contents in this Section for a complete list of all
HVAC related symptoms.
No
>> Go To 2
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HVAC - ELECTRICAL DIAGNOSTICS
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B1049–FLOOR/DEFROST MODE DOOR CONTROL CIRCUIT OPEN (CONTINUED)
2.
CHECK MODE DOOR 2 (FLOOR TO DEFROST) ACTUATOR CIRCUIT RESISTANCE
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the (C801) Mode Door 2 Driver cir-
cuit and the (C34) Common Door Driver circuit in the A/C Heater Con-
trol C1 harness connector.
Is the resistance above 55 ohms?
Yes
>> Go To 3
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).
3.
CHECK (C801) MODE DOOR 2 DRIVER CIRCUIT FOR AN OPEN
Disconnect the Mode Door 2 (Floor to Defrost) Actuator harness con-
nector.
Measure the resistance of the (C801) Mode Door 2 Driver circuit
between the A/C Heater Control C1 harness connector and the Mode
Door 2 (Floor to Defrost) Actuator harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the (C801) Mode Door 2 Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT
CONTROL
MODULE
-
DIAGNOSIS
AND
TESTING).
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HVAC - ELECTRICAL DIAGNOSTICS
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B1049–FLOOR/DEFROST MODE DOOR CONTROL CIRCUIT OPEN (CONTINUED)
4.
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 Mode
Door 2 (Floor to Defrost) Actuator harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Mode Door 2 (Floor to Defrost) 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).
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HVAC - ELECTRICAL DIAGNOSTICS
24 - 77
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