Chrysler Town, Dodge Caravan. Manual — part 837
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Rear Blower Front Control Switch harness connector.
Disconnect the Rear Blower Rear Control Switch C1 harness connector.
Measure the resistance between ground and each of the Rear Blower Motor Driver
circuits (Low, Medium, and High) in the Rear Blower Front Control Switch harness
connector.
Is the resistance below 10K ohms on any of the circuits?
All
Yes
→ Repair all Rear Blower Motor Driver circuits with a resistance
below 10K ohms for a short to ground.
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.
4
Turn the Rear Blower switch on the A/C - Heater Control Module off.
Turn the Power switch on the A/C - Heater Control Module off.
Turn the ignition off.
Disconnect the Rear Blower Rear Control Switch C1 harness connector.
Turn the ignition on.
Turn the Power switch on the A/C - Heater Control Module on.
Turn the Rear Blower switch on the A/C - Heater Control Module to the Low,
Medium, and High speed positions while listening for the rear blower motor to
change speed accordingly.
Does the rear blower speed change accordingly?
All
Yes
→ Replace the Rear Blower Rear Control Switch in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the Power switch on the A/C - Heater Control Module off.
Turn the ignition off.
Disconnect the Rear Blower Front Control Switch harness connector.
Disconnect the Rear Blower Rear Control Switch C1 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 connect to ground, back probe each of the Rear Blower
Motor Driver circuits (Low, Medium, and High) in the Rear Blower Front Control
Switch harness connector and in the Rear Blower Rear Control Switch C1 harness
connector.
Does the test light illuminate brightly on each circuit?
All
Yes
→ Go To 6
No
→ Go To 10
584
HEATING & A/C
*REAR BLOWER MOTOR SPEEDS INCORRECT - MTC —
Continued
TEST
ACTION
APPLICABILITY
6
Turn the Power switch on the A/C - Heater Control Module off.
Turn the ignition off.
Disconnect the Rear Blower Front Control Switch harness connector.
Disconnect the Rear Blower Rear Control Switch C1 harness connector.
Turn the ignition on
Measure the voltage of each of the Rear Blower Motor Driver circuits (Low, Medium,
and High).
Is there voltage present on any of the circuits?
All
Yes
→ Repair all Rear Blower Motor Driver circuits with voltage present
for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the Power switch on the A/C - Heater Control Module off.
Turn the ignition off.
Disconnect the Rear Blower Front Control Switch harness connector.
Disconnect the Rear Blower Rear Control Switch C1 harness connector.
Turn the ignition on
Measure the voltage of the Rear Blower Motor Front Control Feed circuit.
Is there any voltage present?
All
Yes
→ Repair the Rear Blower Motor Front Control Feed circuit for a
short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 8
8
Turn the ignition off.
Disconnect the Rear Blower Front Control Switch harness connector.
Disconnect the Rear Blower Rear Control Switch C1 harness connector.
Measure the resistance between the Rear Blower Motor Front Control Feed circuit
and each of the Rear Blower Motor Driver circuits (Low, Medium, and High).
Is the resistance below 10K ohms on any of the circuits?
All
Yes
→ Repair all Rear Blower Motor Driver circuits with a resistance
below 10K ohms for a short to the Rear Blower Motor Front
Control Feed circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 9
9
Turn the ignition off.
Disconnect the Rear Blower Front Control Switch harness connector.
Disconnect the Rear Blower Rear Control Switch C1 harness connector.
Disconnect the Rear Blower Motor Resistor Block harness connector.
Measure the resistance between the Rear Blower Motor Low circuit and the Rear
Blower Motor Medium and High circuits.
Measure the resistance between the Rear Blower Motor Medium circuit and the Rear
Blower Motor High circuit.
Is the resistance below 10K ohms between any of the circuits?
All
Yes
→ Repair the shorted Rear 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.
585
HEATING & A/C
*REAR BLOWER MOTOR SPEEDS INCORRECT - MTC —
Continued
TEST
ACTION
APPLICABILITY
10
Turn the ignition off.
Disconnect the Rear Blower Front Control Switch harness connector.
Disconnect the Rear Blower Rear Control Switch C1 harness connector.
Disconnect the Rear Blower Motor Resistor Block harness connector.
Measure the resistance of each of the Rear Blower Motor Driver circuits (Low,
Medium, and High) between the Rear Blower Motor Resistor Block harness connec-
tor and the Rear Blower Motor Front Control Switch harness connector.
Measure the resistance of each of the Rear Blower Motor Driver circuits (Low,
Medium, and High) between the Rear Blower Motor Resistor Block harness connec-
tor and the Rear Blower Rear Control Switch C1 harness connector.
Is the resistance below 5.0 ohms on each of the circuits?
All
Yes
→ Replace the Rear Blower Motor Resistor Block in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair all Rear Blower Motor Driver circuit(s) with a resistance
above 5 ohms for an open.
Perform BODY VERIFICATION TEST - VER 1.
586
HEATING & A/C
*REAR BLOWER MOTOR SPEEDS INCORRECT - MTC —
Continued
Symptom:
*REAR BLOWER REAR CONTROL SWITCH INOP IN ONE OR
MORE SPEEDS - MTC
POSSIBLE CAUSES
REAR BLOWER MOTOR DRIVER CIRCUIT(S) OPEN
REAR BLOWER REAR CONTROL SWITCH
REAR BLOWER MOTOR FRONT CONTROL FEED CIRCUIT OPEN
A/C - HEATER CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Rear Blower Rear Control Switch C1 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 Rear Blower
Motor Driver circuits (Low, Medium, and High).
Does the test light illuminate brightly on each circuit?
All
Yes
→ Go To 2
No
→ Repair all Rear Blower Motor Driver circuits that failed to
illuminate the test light brightly for an open.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the Power switch on the A/C - Heater Control Module off.
Turn the ignition off.
Make sure that the Rear Blower Rear Control C1 harness connector is connected to
the Rear Blower Rear Control Switch.
Using a jumper wire connected to ground, back probe the Rear Blower Motor Front
Control Feed circuit in the Rear Blower Rear Control Switch C1 harness connector.
Turn the ignition on.
Turn the Power switch on the A/C - Heater Control Module on.
Turn the Blower switch on the Rear Blower Rear Control Switch to each speed
position.
Does the rear blower run in all speeds?
All
Yes
→ Go To 3
No
→ Replace the Rear Blower Rear Control Switch in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
587
HEATING & A/C
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