Chrysler RG Voyager. Manual — part 185
TEST
ACTION
APPLICABILITY
11
Turn the ignition off.
Remove the Rear Blower Motor Relay from the IPM.
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 cavity 30 of the Rear Blower
Motor Relay connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 12
No
→ Replace the IPM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
12
Turn the ignition off.
Remove the Rear Blower Motor Relay from the IPM.
Remove IPM Fuse #12.
Measure the resistance between cavity 87 of the Rear Blower Motor Relay connector
and IPM Fuse #12 (power input cavity).
Is the resistance below 5 ohms?
All
Yes
→ Go To 13
No
→ Replace the IPM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
13
Turn the ignition off.
Make sure that the Rear Blower Motor Relay is installed.
Remove IPM Fuse #12.
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 #12 (power input
cavity).
Does the test light illuminate brightly?
All
Yes
→ Go To 14
No
→ Replace the Rear Blower Motor Relay in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
14
Turn the ignition off.
Remove IPM Fuse #12.
Disconnect the IPM C8 harness connector.
Measure the resistance between IPM Fuse #12 (power output cavity) and cavity 7 of
the IPM C8 connector (IPM side).
Is the resistance below 5 ohms?
All
Yes
→ Repair the Fused Rear 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.
709
HEATING & A/C
*REAR BLOWER MOTOR INOPERATIVE - MTC —
Continued
Symptom:
*REAR BLOWER MOTOR SPEEDS INCORRECT - MTC
POSSIBLE CAUSES
REAR BLOWER REAR CONTROL SWITCH
REAR BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO GROUND
A/C - HEATER CONTROL MODULE
REAR BLOWER REAR CONTROL SWITCH
REAR BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
REAR BLOWER MOTOR FRONT CONTROL FEED CIRCUIT SHORTED TO VOLTAGE
REAR BLOWER DRIVER CKT(S) SHORTED TO REAR BLOWER FRONT CONTROL FEED CKT
REAR BLOWER MOTOR DRIVER CIRCUITS SHORTED TOGETHER
A/C - HEATER CONTROL MODULE
REAR BLOWER MOTOR DRIVER CIRCUIT(S) OPEN
REAR BLOWER MOTOR RESISTOR BLOCK
TEST
ACTION
APPLICABILITY
1
Turn the Rear Blower Switch on the A/C - Heater Control Module off.
Turn the ignition on.
On RG vehicles, press the A/C - Heater Control power switch on.
Does the rear blower run?
All
Yes
→ Go To 2
No
→ Go To 4
2
Turn the Rear Blower switch on the A/C - Heater Control Module off.
On RG vehicles, press the A/C - Heater Control power switch off.
Turn the ignition off.
Disconnect the Rear Blower Rear Control Switch C1 harness connector.
Turn the ignition on.
On RG vehicles, press the A/C - Heater Control power switch on.
Does the rear blower run?
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.
710
HEATING & A/C
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.
On RG vehicles, press the A/C - Heater Control power switch off.
Turn the ignition off.
Disconnect the Rear Blower Rear Control Switch C1 harness connector.
Turn the ignition on.
On RG vehicles, press the A/C - Heater Control power switch 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
On RG vehicles, press the A/C - Heater Control power switch 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.
On RG vehicles, press the A/C - Heater Control power switch 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
711
HEATING & A/C
*REAR BLOWER MOTOR SPEEDS INCORRECT - MTC —
Continued
TEST
ACTION
APPLICABILITY
6
On RG vehicles, press the A/C - Heater Control power switch 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
On RG vehicles, press the A/C - Heater Control power switch 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.
712
HEATING & A/C
*REAR BLOWER MOTOR SPEEDS INCORRECT - MTC —
Continued
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