Dodge Ram Truck 1500-2500-3500. Manual — part 2041
*BLOWER MOTOR INOPERATIVE (EXCEPT 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
(C7) BLOWER MOTOR FEED CIRCUIT SHORTED TO GROUND
(A970) FUSED B(+) CIRCUIT SHORTED TO GROUND
(C70) BLOWER MOTOR HIGH DRIVER CIRCUIT OPEN
(Z134) GROUND CIRCUIT OPEN
(C7) BLOWER MOTOR FEED CIRCUIT OPEN
(A970) FUSED B(+) CIRCUIT OPEN
IPM FUSE #4 OPEN
BLOWER MOTOR
IGNITION SWITCH
A/C HEATER CONTROL
Diagnostic Test
1.
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 2.
No
>> Reinstall IPM Fuse #4 and Go To 5.
2.
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 3
24 - 164
HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
*BLOWER MOTOR INOPERATIVE (EXCEPT SRT10) (CONTINUED)
3.
CHECK THE (C7) BLOWER MOTOR FEED CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Blower Motor harness connector.
Measure the resistance of the (C7) Blower Motor Feed circuit between
ground and the Blower Motor harness connector.
Is the resistance below 10K ohms?
Yes
>> Repair the (C7) Blower Motor Feed circuit for a short to
ground 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 4
4.
CHECK THE (A970) FUSED B(+) CIRCUIT FOR A SHORT TO GROUND
Disconnect the Ignition Switch harness connector.
Measure the resistance of the (A970) Fused B(+) circuit between
ground and the Ignition Switch harness connector.
Is the resistance below 10K ohms?
Yes
>> Repair the (A970) Fused B(+) circuit for a short to ground
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
>> Replace the Blower Motor and fuse 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 - 165
*BLOWER MOTOR INOPERATIVE (EXCEPT SRT10) (CONTINUED)
5.
CHECK THE (C7) BLOWER MOTOR FEED CIRCUIT USING A TEST LIGHT
Turn the ignition on.
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 Blower Motor harness connector.
Does the test light illuminate brightly?
Yes
>> Go To 6
No
>> Go To 9
6.
CHECK BLOWER MOTOR OPERATION BY BYPASSING THE A/C HEATER CONTROL
Turn the ignition off.
Connect a jumper wire between ground and the (C70) Blower Motor
High Driver circuit in the Blower Motor harness connector.
Turn the ignition on.
Does the blower motor run at high speed?
Yes
>> Go To 7
No
>> Replace the Blower Motor 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).
24 - 166
HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
*BLOWER MOTOR INOPERATIVE (EXCEPT SRT10) (CONTINUED)
7.
CHECK THE (C70) BLOWER MOTOR HIGH DRIVER CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Disconnect the Blower Motor harness connector.
Measure the resistance of the (C70) Blower Motor High Driver circuit
between the A/C Heater Control C2 harness connector and the Blower
Motor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 8
No
>> 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
TESTING).
8.
CHECK THE (Z134) GROUND CIRCUIT FOR AN OPEN
Measure the resistance of the (Z134) Ground circuit between ground
and the A/C Heater Control C2 harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the A/C Heater Control in accordance with the
Service Information.
No
>> Repair the (Z134) Ground 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 - 167
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст