Chrysler Town, Dodge Caravan. Manual — part 834
TEST
ACTION
APPLICABILITY
15
Turn the ignition off.
Make sure that the Front Blower Motor Relay is installed.
Remove IPM Fuse #10.
Turn the ignition on.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Using a 12-volt test light connected to ground, probe IPM Fuse #10 (power input
cavity).
Does the test light illuminate brightly?
All
Yes
→ Go To 16
No
→ Replace the Front Blower Motor Relay in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
16
Turn the ignition off.
Remove IPM Fuse #10.
Disconnect the IPM C6 harness connector.
Measure the resistance between IPM Fuse #10 (power output cavity) and cavity 7 of
the IPM C6 connector (IPM side).
Is the resistance below 5 ohms?
All
Yes
→ Repair the Fused Front Blower Motor Relay Output circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the IPM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
572
HEATING & A/C
*FRONT BLOWER MOTOR INOPERATIVE - MTC —
Continued
Symptom:
*FRONT BLOWER MOTOR SPEEDS INCORRECT - MTC
POSSIBLE CAUSES
BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO GROUND
BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
BLOWER MOTOR DRIVER CIRCUITS SHORTED TOGETHER
A/C - HEATER CONTROL MODULE - SPEEDS INCORRECT
BLOWER MOTOR DRIVER CIRCUIT(S) OPEN
BLOWER MOTOR RESISTOR BLOCK - OPEN SPEED
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Front Blower Motor Resistor Block C1 harness connector.
Measure the resistance between ground and each of the Blower Motor Driver circuits.
Is the resistance below 10K ohms on any of the circuits?
All
Yes
→ Repair all Blower Motor Driver circuits with a resistance below
10K ohms for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Ensure that the Front Blower Motor Resistor Block C1 harness connector is
connected to the Front Blower Motor Resistor Block.
Disconnect the A/C - Heater Control Module C2 harness connector.
Turn the ignition on.
Turn the Power switch on the A/C - Heater Control Module on.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Using a 12-volt test light connected to ground, back probe each of the Blower Motor
Driver circuits (cavities 2, 3, 5, 9, and 10).
Does the test light illuminate brightly on each circuit?
All
Yes
→ Go To 3
No
→ Go To 5
3
Turn the Power switch on the A/C - Heater Control Module off.
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Front Blower Motor Resistor Block C1 harness connector.
Turn the ignition on.
Measure the voltage of each of the Blower Motor Driver circuits (cavities 2, 3, 5, 9,
and 10) in the A/C - Heater Control Module C2 harness connector.
Is there any voltage present?
All
Yes
→ Repair all Blower Motor Driver circuits with voltage present for a
short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
573
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Front Blower Motor Resistor Block C1 harness connector.
Measure the resistance between the Blower Motor Low Driver circuit and the M1,
M2, M3 and Blower Motor High Driver circuits.
Measure the resistance between the Blower Motor M1 Driver circuit and the M2, M3,
and Blower Motor High Driver circuits.
Measure the resistance between the Blower Motor M2 Driver circuit and the M3 and
Blower Motor High Driver circuit.
Measure the resistance between the Blower Motor M3 Driver circuit and the Blower
Motor High Driver circuit.
Is the resistance below 10K ohms between any of the circuits?
All
Yes
→ Repair the shorted Blower Motor Driver circuits.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
5
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Front Blower Motor Resistor Block C1 harness connector.
Measure the resistance of each Blower Motor Driver circuit between the Front
Blower Motor Resistor Block C1 harness connector and the A/C - Heater Control
Module C2 harness connector.
Is the resistance below 5.0 ohms on each of the circuits?
All
Yes
→ Replace the Front Blower Motor Resistor Block in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair all Blower Motor Driver circuits with a resistance above 5
ohms for an open.
Perform BODY VERIFICATION TEST - VER 1.
574
HEATING & A/C
*FRONT BLOWER MOTOR SPEEDS INCORRECT - MTC —
Continued
Symptom:
*HVAC SYSTEM TEST - MTC
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE PCM/ECM, THE BCM, AND THE FCM
CHECK FOR HVAC RELATED DTCS IN THE PCM/ECM
CHECK FOR BCM DTCS
CHECK FOR FCM DTCS
CHECK FOR ACTIVE HVAC DTCS AND SYSTEM TESTS FAULT MESSAGES
CHECK FOR HVAC RELATED DTCS IN THE PCM/ECM
MANUAL A/C SYSTEM TEST
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the Powertrain/Engine Control
Module.
With the DRBIII
t, attempt to communicate with the Body Control Module.
With the DRBIII
t, attempt to communicate with the Front Control Module.
Was the DRBIII
t able to communicate with the PCM/ECM, the BCM, and the FCM?
All
Yes
→ Go To 2
No
→ Refer to the communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
2
With the DRBIII
t, read Powertrain/Engine Computer DTCs.
Are any HVAC related DTCs present?
All
Yes
→ Refer to the Powertrain Diagnostic Procedures Manual for the
related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
With the DRBIII
t, read Body Computer DTCs.
Are any DTCs present?
All
Yes
→ Refer to the appropriate catagory for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
With the DRBIII
t, read Front Control Module DTCs.
Are any DTCs present?
All
Yes
→ For FCM DTCs related to the blower relay circuits, refer to the
Heating & A/C catagory. For all other FCM DTCs, refer to the
symptom list in the related catagory.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
575
HEATING & A/C
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