Dodge Dakota (ND). Manual — part 1254
B104E–BLEND DOOR CONTROL CIRCUIT HIGH (CONTINUED)
2.
RUN THE ACTUATOR DTC DETECTION TEST
Turn the ignition off.
Reconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
With the scan tool in HVAC, select System Tests and then select Actuator DTC Detection. When the test is com-
plete, select View DTCs.
Does the scan tool only display: B104E–BLEND DOOR CONTROL CIRCUIT HIGH?
Yes
>> 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).
No, Other DTC(s) Displayed
Diagnose and repair the other DTC(s). If multiple DTCs are present, beginning with the common circuit,
diagnose and repair all short high DTCs and then all short low DTCs. Refer to the Table of Contents in
this Section for a complete list of all HVAC related symptoms.
No, And No Other DTCs Displayed
Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an inter-
mittent short. Repair as necessary.
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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B104F–BLEND DOOR CONTROL CIRCUIT OPEN
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HVAC - ELECTRICAL DIAGNOSTICS
24 - 15
B104F–BLEND 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 Blend Door Actuator via the (C61) Blend Door Driver circuit and the (C34) Com-
mon 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 depending 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 Blend Door Actuator’s electrical circuit is open. This DTC has a maturing time of 5 seconds and a de-ma-
turing 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
(C61) BLEND DOOR DRIVER CIRCUIT OPEN
(C34) COMMON DOOR DRIVER CIRCUIT OPEN
BLEND DOOR ACTUATOR
A/C HEATER CONTROL
NOTE: DTC B104F must be active for the results of this test to be valid. Do not perform this test if DTC
B104F 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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B104F–BLEND DOOR CONTROL CIRCUIT OPEN (CONTINUED)
2.
CHECK BLEND DOOR ACTUATOR CIRCUIT RESISTANCE
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the (C61) Blend Door Driver circuit
and the (C34) Common Door Driver circuit in the A/C Heater Control
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 (C61) BLEND DOOR DRIVER CIRCUIT FOR AN OPEN
Disconnect the 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 Blend Door
Actuator harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 4
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).
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HVAC - ELECTRICAL DIAGNOSTICS
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