Chrysler Sebring, Stratus sedan, Sebring Convertible. Manual — part 87
Symptom:
*BLOWER MOTOR INOPERATIVE - MTC
POSSIBLE CAUSES
JUNCTION BLOCK FUSE #1
FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT SHORTED TO GROUND
BLOWER MOTOR SHORTED TO GROUND
GROUND CIRCUIT OPEN
A/C - HEATER CONTROL OPEN
BLOWER MOTOR DRIVER CIRCUIT OPEN
RESISTOR-OPEN HI BLOWER MOTOR DRIVER
BLOWER MOTOR DRIVER CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT OPEN
BLOWER MOTOR OPEN
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Remove and inspect Junction Block Fuse #1.
Is the fuse open?
All
Yes
→ Go To 2
No
→ Go To 4
2
Turn the ignition off.
Replace Junction Block Fuse #1.
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?
All
Yes
→ Check the Fused Ignition Switch Output (RUN) circuit for an
intermittent short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Turn the Blower switch off.
Disconnect the Blower Motor harness connector.
Measure the resistance between ground and the Fused Ignition Switch Output
(RUN) circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the Fused Ignition Switch Output (RUN) circuit for a short
to ground and replace the fuse.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Blower Motor and fuse in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
333
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Ensure Junction Block Fuse #1 is installed.
Turn the Blower switch off.
Disconnect the Blower Motor Resistor Block harness connector.
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, back probe the Blower Motor Driver
circuit in the Blower Motor Resistor Block harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 5
No
→ Go To 8
5
Turn the ignition off.
Disconnect the A/C - Heater Control C2 harness connector.
Connect a jumper wire between ground and the High Blower Motor Driver circuit in
the A/C - Heater Control C2 harness connector.
Turn the ignition on.
Does the blower motor run at high speed?
All
Yes
→ Go To 6
No
→ Go To 7
6
Turn the ignition off.
Disconnect the A/C - Heater Control C2 harness connector.
Measure the resistance between ground and the Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the A/C - Heater Control in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
7
Turn the ignition off.
Disconnect the A/C - Heater Control C2 harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance of the High Blower Motor Driver circuit between the A/C -
Heater Control C2 harness connector and the Blower Motor Resistor Block harness
connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Blower Motor Resistor Block in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the High Blower Motor Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
334
HEATING & A/C
*BLOWER MOTOR INOPERATIVE - MTC —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the Blower switch off.
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, back probe the Blower Motor Driver
circuit in the Blower Motor harness connector.
Does the test light illuminate brightly?
All
Yes
→ Repair the Blower Motor Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 9
9
Turn the Blower switch off.
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, back probe the Fused Ignition Switch
Output (RUN) circuit in the Blower Motor harness connector.
Does the test light illuminate brightly?
All
Yes
→ Replace the Blower Motor in accordance with the Service Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Fused Ignition Switch Output (RUN) circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1.
335
HEATING & A/C
*BLOWER MOTOR INOPERATIVE - MTC —
Continued
Symptom:
*BLOWER MOTOR SPEEDS INCORRECT - MTC
POSSIBLE CAUSES
BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO GROUND
BLOWER MOTOR DRIVER CIRCUIT SHORTED TO GROUND
A/C - HEATER CONTROL
BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
BLOWER MOTOR DRIVER CIRCUITS SHORTED TOGETHER
A/C - HEATER CONTROL - SPEEDS INCORRECT
BLOWER MOTOR DRIVER CIRCUIT(S) OPEN
BLOWER MOTOR RESISTOR BLOCK - OPEN SPEED
TEST
ACTION
APPLICABILITY
1
Turn the Blower switch off.
Turn the ignition on.
Does the blower run?
All
Yes
→ Go To 2
No
→ Go To 4
2
Turn the ignition off.
Disconnect the A/C - Heater Control C2 harness connector.
Disconnect the Blower Motor Resistor Block 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 the Blower Motor Driver circuit(s) for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the Blower Motor harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance between ground and the Blower Motor Driver circuit in the
Blower Motor harness connector.
Is the resistance below 10K ohms?
All
Yes
→ Repair the Blower Motor Driver circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the A/C - Heater Control in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
336
HEATING & A/C
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