Dodge Ram Truck 1500-2500-3500. Manual — part 2045
*BLOWER SPEED DOES NOT CORRESPOND WITH CONTROL SETTING (CONTINUED)
6.
CHECK THE (C73) BLOWER MOTOR M2 DRIVER CIRCUIT FOR A SHORT TO THE (C72) BLOWER
MOTOR M1 DRIVER CIRCUIT & THE (C70) BLOWER MOTOR HIGH DRIVER CIRCUIT
Measure the resistance between the (C73) Blower Motor M2 Driver
circuit and the (C72) Blower Motor M1 Driver circuit and the (C70)
Blower Motor High Driver circuit in the A/C Heater Control C2 harness
connector.
Is the resistance below 10K ohms between the (C73) Blower
Motor M2 Driver circuit and any of the other circuits?
Yes
>> Repair all circuits with a resistance below 10k ohms for a
short to the (C73) Blower Motor M2 Driver circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Go To 7
7.
CHECK THE (C72) BLOWER MOTOR M1 DRIVER CIRCUIT FOR A SHORT TO THE (C70) BLOWER
MOTOR HIGH DRIVER CIRCUIT
Measure the resistance between the (C72) Blower Motor M1 Driver
circuit and the (C70) Blower Motor High Driver circuit in the A/C
Heater Control C2 harness connector.
Is the resistance below 10K ohms?
Yes
>> Repair the (C72) Blower Motor M1 Driver circuit for a short
to the (C70) Blower Motor High Driver circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
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).
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HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
*BLOWER SPEED DOES NOT CORRESPOND WITH CONTROL SETTING (CONTINUED)
8.
CHECK THE (C71) BLOWER MOTOR LOW DRIVER CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance of the (C71) Blower Motor Low Driver circuit
between the Blower Motor Resistor Block harness connector and the
A/C Heater Control C2 harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 9
No
>> Repair the (C71) Blower Motor Low Driver circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT
CONTROL
MODULE
-
DIAGNOSIS
AND
TESTING).
9.
CHECK THE (C73) BLOWER MOTOR M2 DRIVER CIRCUIT FOR AN OPEN
Measure the resistance of the (C73) Blower Motor M2 Driver circuit
between the Blower Motor Resistor Block harness connector and the
A/C Heater Control C2 harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 10
No
>> Repair the (C73) Blower Motor M2 Driver circuit for an
open.
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 - 181
*BLOWER SPEED DOES NOT CORRESPOND WITH CONTROL SETTING (CONTINUED)
10.
CHECK THE (C72) BLOWER MOTOR M1 DRIVER CIRCUIT FOR AN OPEN
Measure the resistance of the (C72) Blower Motor M1 Driver circuit
between the Blower Motor Resistor Block harness connector and the
A/C Heater Control C2 harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 11
No
>> Repair the (C72) Blower Motor M1 Driver circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT
CONTROL
MODULE
-
DIAGNOSIS
AND
TESTING).
11.
CHECK THE (C70) BLOWER MOTOR HIGH DRIVER CIRCUIT FOR AN OPEN
Measure the resistance of the (C70) Blower Motor High Driver circuit
between the Blower Motor Resistor Block harness connector and the
A/C Heater Control C2 harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (C70) Blower Motor High Driver circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Replace the Blower Motor Resistor Block 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).
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HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
*EBL STATUS INDICATOR FLASHING
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
Running the HVAC Door Recalibration will cause the EBL status indicator to flash. If recalibration fails, the status
indicator will continue to flash until either the system passes recalibration or the ignition key is cycled. When the
EBL status indicator is flashing, it will not indicate EBL operating status. However, the EBL mode switch will continue
to function normally. When the EBL status indicator is flashing, the A/C status indicator will not function. However,
the A/C mode switch will continue to function normally.
Possible Causes
HVAC DOOR RECALIBRATION FAILED
1.
PERFORM THE HVAC DOOR RECALIBRATION
Turn the ignition on.
With the DRBIII
T
in HVAC, select System Tests and then select HVAC Door Recalibration. Allow the test to run to
completion before proceeding.
Does the DRBIII
T
display: Recalibration Test Passed?
Yes
>> Test Complete.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Diagnose and repair the fault(s). Refer to the Table of Contents in this Section for a complete list of all
HVAC related symptoms.
DR/DH
HVAC - ELECTRICAL DIAGNOSTICS
24 - 183
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