Chrysler Town, Dodge Caravan. Manual — part 827
Symptom List:
FRONT AND REAR BLOWER OUTPUT 1 OPEN
FRONT AND REAR BLOWER OUTPUT 2 OPEN
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be FRONT AND REAR BLOWER
OUTPUT 1 OPEN.
When Monitored and Set Condition:
FRONT AND REAR BLOWER OUTPUT 1 OPEN
When Monitored:
Continuously.
Set Condition:
If the FCM detects no voltage present on the Front/Rear Blower Motor
Relay Control circuit.
FRONT AND REAR BLOWER OUTPUT 2 OPEN
When Monitored:
Continuously.
Set Condition:
If the FCM detects no voltage present on the Front/Rear Blower Motor
Relay Control circuit.
POSSIBLE CAUSES
CHECK DTCS
B+ CIRCUIT OPEN
FRONT AND REAR BLOWER RELAYS OPEN
FRONT/REAR BLOWER MOTOR RELAY CONTROL CIRCUIT SHORTED TO GROUND
FRONT/REAR BLOWER MOTOR RELAY CONTROL CIRCUIT OPEN
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: If neither DTC will reset or is active, refer to the wiring diagrams
located in the service information to help isolate a possible intermittent
condition.
With the DRB, read the FCM DTCs.
Are both the Front/Rear Blower Output 1 Open and the Front/Rear Blower Output
2 Open DTCs set?
All
Yes
→ Go To 2
No
→ Replace the Front Control Module (FCM) in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
544
HEATING & A/C
TEST
ACTION
APPLICABILITY
2
Remove either the Front Blower Motor Relay or the Rear Blower Motor Relay, if
equipped, from the IPM.
Using a 12-volt test light connected to ground, probe cavity 86 of the blower relay
connector.
Is the test light illuminated?
All
Yes
→ Go To 3
No
→ Check the B+ feed to the Intelligent Power Module (IPM) for an
open. If OK, replace the IPM in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Install a substitute relay in place of the existing Front Blower Motor Relay and the
existing Rear Blower Motor Relay, if equipped.
With the DRB, erase DTCs.
Turn the ignition off, wait 30 seconds, then turn the ignition on.
With the DRB, read DTCs.
Did these DTCs reset?
All
Yes
→ Go To 4
No
→ Replace the Front Blower Motor Relay and the Rear Blower Motor
Relay, if equipped.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Remove the Front Control Module from the IPM.
Remove the Front Blower Motor Relay and the Rear Blower Motor Relay, if equipped,
from the IPM.
Measure the resistance between ground and the Front/Rear Blower Motor Relay
Control circuit (FCM connector cavity 30).
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Intelligent Power Module (IPM) in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Remove the Front Control Module from the IPM.
Remove the Front Blower Motor Relay from the IPM.
Measure the resistance of the Front/Rear Blower Motor Relay Control circuit
between the FCM connector cavity 30 and the Front Blower Motor Relay connector
cavity 85.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Front Control Module (FCM) in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Intelligent Power Module (IPM) in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
545
HEATING & A/C
FRONT AND REAR BLOWER OUTPUT 1 OPEN —
Continued
Symptom List:
FRONT AND REAR BLOWER OUTPUT 1 SHORT TO BATT
FRONT AND REAR BLOWER OUTPUT 2 SHORT TO BATT
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be FRONT AND REAR BLOWER
OUTPUT 1 SHORT TO BATT.
When Monitored and Set Condition:
FRONT AND REAR BLOWER OUTPUT 1 SHORT TO BATT
When Monitored:
With the ignition on.
Set Condition:
The FCM detects excessive current when attempting to close the Front/
Rear Blower Motor Relays.
FRONT AND REAR BLOWER OUTPUT 2 SHORT TO BATT
When Monitored:
With the ignition on.
Set Condition:
The FCM detects excessive current when attempting to close the Front/
Rear Blower Motor Relays.
POSSIBLE CAUSES
CHECK DTCS
FRONT BLOWER MOTOR RELAY SHORTED
REAR BLOWER MOTOR RELAY SHORTED
FRONT/REAR BLOWER MOTOR RELAY CONTROL CIRCUIT SHORTED TO BATTERY
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: If neither DTC will reset or is active, refer to the wiring diagrams
located in the service information to help isolate a possible intermittent
condition.
With the DRB, read the FCM DTCs.
Are both of these DTCs set?
All
Yes
→ Go To 2
No
→ Replace the Front Control Module (FCM) in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
546
HEATING & A/C
TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
Install a substitute relay in place of the existing Front Blower Motor Relay.
With the DRB, erase DTCs.
Turn the ignition on.
With the DRB, read DTCs.
Did these DTCs reset?
All
Yes, equipped with rear blower motor
Yes, not equipped with rear blower motor
No
→ Replace the original Front Blower Motor Relay.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Install a substitute relay in place of the existing Rear Blower Motor Relay.
With the DRB, erase DTCs.
Turn the ignition on.
With the DRB, read DTCs.
Did these DTCs reset?
All
Yes
→ Go To 4
No
→ Replace the original Rear Blower Motor Relay.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Remove the Front Control Module from the IPM.
Remove the Front Blower Motor Relay and the Rear Blower Motor Relay, if equipped,
from the IPM.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Front Blower Motor Relay
connector cavity 85.
Is the test light illuminated?
All
Yes
→ Replace the Intelligent Power Module (IPM) in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Front Control Module (FCM) in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
547
HEATING & A/C
FRONT AND REAR BLOWER OUTPUT 1 SHORT TO BATT —
Continued
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