Dodge Ram Truck 1500-2500-3500. Manual — part 2042
*BLOWER MOTOR INOPERATIVE (EXCEPT SRT10) (CONTINUED)
9.
CHECK THE (C7) BLOWER MOTOR FEED CIRCUIT FOR AN OPEN
NOTE: The test light must illuminate brightly. Compare the bright-
ness to that of a direct connection to the battery.
Using a 12-volt test light connected to ground, back probe the (C7)
Blower Motor Feed circuit in the Ignition Switch harness connector.
Does the test light illuminate brightly?
Yes
>> Repair the (C7) Blower Motor Feed 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
>> Go To 10
10.
CHECK THE (A970) FUSED B(+) CIRCUIT FOR AN OPEN
NOTE: The test light must illuminate brightly. Compare the bright-
ness to that of a direct connection to the battery.
Using a 12-volt test light connected to ground, back probe the (A970)
Fused B(+) circuit in the Ignition Switch harness connector.
Does the test light illuminate brightly?
Yes
>> Replace the Ignition Switch 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 (A970) Fused B(+) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT
CONTROL
MODULE
-
DIAGNOSIS
AND
TESTING).
24 - 168
HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
*BLOWER MOTOR INOPERATIVE (SRT10)
DR/DH
HVAC - ELECTRICAL DIAGNOSTICS
24 - 169
*BLOWER MOTOR INOPERATIVE (SRT10) (CONTINUED)
For the Manual Temperature Control circuit diagrams (Refer to 24 - HEATING & AIR CONDITIONING - SCHEMAT-
ICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
Possible Causes
FAULTS PRESENT IN THE FRONT CONTROL MODULE (FCM)
(C7) BLOWER MOTOR FEED CIRCUIT SHORTED TO (Z1) GROUND CIRCUIT
(A970) FUSED B(+) CIRCUIT SHORTED TO (Z1) GROUND
CIRCUIT
(C7) BLOWER MOTOR FEED CIRCUIT SHORTED TO GROUND
(A970) FUSED B(+) CIRCUIT SHORTED TO GROUND
(Z1) GROUND CIRCUIT OPEN
(A970) FUSED B(+) CIRCUIT OPEN
(F102) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT OPEN
(C7) BLOWER MOTOR FEED CIRCUIT OPEN
(C70) BLOWER MOTOR HIGH DRIVER CIRCUIT OPEN
(Z134) GROUND CIRCUIT OPEN
IPM FUSE #4 OPEN
BLOWER MOTOR RELAY
BLOWER MOTOR
A/C HEATER CONTROL
Diagnostic Test
1.
CHECK FOR ACTIVE DTCs IN THE FRONT CONTROL MODULE (FCM)
Turn the ignition on.
With the DRBIII
T
, read active Front Control Module DTCs.
Does the DRBIII
T
display any active DTCs?
Yes
>> Diagnose and repair the DTC(s). Refer to the Table of Contents in the related category for the diag-
nostic test procedure(s).
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Go To 2
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HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
*BLOWER MOTOR INOPERATIVE (SRT10) (CONTINUED)
2.
CHECK THE FUSE
Turn the ignition off.
Remove and inspect IPM Fuse #4.
Is the fuse open?
Yes
>> Replace IPM Fuse #4 and Go To 3.
No
>> Reinstall IPM Fuse #4 and Go To 7.
3.
CHECK BLOWER MOTOR OPERATION
Turn the ignition on.
Turn the blower on and operate it in all speeds and modes.
Does the blower motor operate properly without blowing the fuse?
Yes
>> Check the (C7) Blower Motor Feed circuit and the (A970) Fused B(+) circuit for an intermittent short to
ground. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Go To 4
4.
CHECK THE (C7) BLOWER MOTOR FEED CIRCUIT & THE (A970) FUSED B(+) CIRCUIT FOR A SHORT
TO THE (Z1) GROUND CIRCUIT
Turn the ignition off.
Remove the Blower Motor Relay from the IPM.
Measure the resistance between the (Z1) Ground circuit and the (C7)
Blower Motor Feed circuit in the Blower Motor Relay connector.
Measure the resistance between the (Z1) Ground circuit and the
(A970) Fused B(+) in the Blower Motor Relay connector.
Is the resistance below 10K ohms on either circuit?
Yes
>> Repair all circuits with a resistance below 10k ohms for a
short to the (Z1) Ground circuit and replace the fuse.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
No
>> Go To 5
DR/DH
HVAC - ELECTRICAL DIAGNOSTICS
24 - 171
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