Chrysler Sebring, Stratus sedan, Sebring Convertible. Manual - part 88

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the A/C - Heater Control C2 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 each of the Blower Motor
Driver circuits (cavities 2, 3, 7, and 10) in the A/C - Heater Control C2 harness
connector.
Does the test light illuminate brightly on each circuit?

All

Yes

→ Go To 5

→ Go To 7

Turn the ignition off.
Disconnect the A/C - Heater Control C2 harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the voltage of each of the Blower Motor Driver circuits (cavities 2, 3, 7, and
10).
Is there any voltage present?

All

Yes

→ Repair the Blower Motor Driver circuit(s) for a short to voltage.

Perform BODY VERIFICATION TEST - VER 1.

→ Go To 6

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 the Low Blower Motor Driver circuit and the M1,
M2, and High Blower Motor Driver circuits.
Measure the resistance between the M1 Blower Motor Driver circuit and the M2 and
High Blower Motor Driver circuits.
Measure the resistance between the M2 Blower Motor Driver circuit and the High
Blower Motor 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.

→ Replace the A/C - Heater Control in accordance with the Service

Information.
Perform BODY VERIFICATION TEST - VER 1.

Turn the ignition off.
Turn the Blower switch to the off position.
Disconnect the A/C - Heater Control C2 harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance of each Blower Motor Driver circuit between the Blower
Motor Resistor Block harness connector and the A/C - Heater Control C2 harness
connector.
Is the resistance below 5.0 ohms on each of the circuits?

All

Yes

→ Replace the Blower Motor Resistor Block in accordance with the

Service Information.
Perform BODY VERIFICATION TEST - VER 1.

→ Repair the Blower Motor Driver circuit(s) for an open.

Perform BODY VERIFICATION TEST - VER 1.

337

HEATING & A/C

*BLOWER MOTOR SPEEDS INCORRECT - MTC —

Continued

Symptom:

*BLOWER RUNS AT ONLY ONE SPEED - ATC

POSSIBLE CAUSES

CHECK CODE(S) PRESENT

AUTOMATIC TEMPERATURE CONTROL

BLOWER MOTOR CONTROL CIRCUIT SHORTED TO GROUND

BODY CONTROL MODULE

BLOWER POWER MODULE

TEST

ACTION

APPLICABILITY

Turn the ignition on.
With the DRBIII

t, record and erase Body Computer DTC’s.

Cycle the ignition switch.
With the DRBIII

t, read the Body Computer DTCs.

Does the DRBIII

t display any DTCs?

All

Yes

→ Refer to the appropriate category for the related symptom(s).

Perform BODY VERIFICATION TEST - VER 1.

→ Go To 2

Turn the ignition on.
With the DRBIII

t in Automatic Temperature Control, Monitor Display, PCI Bus Info

ATC, look for Fan Req To BCM.
Does the DRB display: Fan Req To BCM: Yes?

All

Yes

→ Go To 3

→ Replace the Automatic Temperature Control in accordance with

the Service Information.
Perform BODY VERIFICATION TEST - VER 1.

Turn the ignition off.
Disconnect the Blower Power Module C1 harness connector.
Disconnect the Body Control Module C1 harness connector.
Measure the resistance between ground and the Blower Motor Control circuit.
Is the resistance below 10K ohms?

All

Yes

→ Repair the Blower Motor Control circuit for a short to ground.

Perform BODY VERIFICATION TEST - VER 1.

→ Go To 4

338

HEATING & A/C

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Reconnect all previously disconnected components.
Connect the DRBIII

t Scope Input Cable CH7058, Cable-To-Probe Adapter CH7062,

and the Red (+) and Black (-) X1 Test Leads CH7030 to the DRBIII

Select the following from the DRBIII

t menu: PEP Module Tools; Lab Scope; Live

Data; and Lab Scope.
Set the time to 0.4ms/Div.
Set the voltage range to +20.0v.
Set the Offset to 4.00v.
Set the Probe to X1.
Start the engine.
Turn Automatic Temperature Control on.
Using the Red (+) X1 Test Lead, back probe the Blower Motor Control circuit in the
Blower Power Module C1 harness connector.
Connect the Black (-) X1 Test Lead to ground.
NOTE: Over the Blower Motor Control circuit, the Blower Power Module
provides a battery supply voltage signal to the Body Control Module (BCM)
while the BCM provides a variable duty cycle ground based on input from
the blower control switch.
NOTE: When the blower control switch is set to Lo speed, the BCM provides
a short duty cycle (less time grounding the signal). As higher blower speeds
are requested, the BCM increases the duty cycle (more time grounding the
signal).
NOTE: When the blower control switch is set to High speed, the duty cycle
increases to where the signal pattern is a flat line on ground.
Set the blower control to LO speed and then slowly turn it to HI speed while
observing the DRBIII

t display.

The duty cycle pattern should change smoothly as the blower switch is turned from
Lo to High. The high part of the cycle will decrease as the blower speed increases.
Does the DRBIII

t display the signal as described above?

All

Yes

→ Replace the Blower Power Module in accordance with the Service

Information.
Perform BODY VERIFICATION TEST - VER 1.

→ Replace and program the Body Control Module in accordance

with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.

339

HEATING & A/C

*BLOWER RUNS AT ONLY ONE SPEED - ATC —

Continued

Symptom:

*VF SEGMENTS STUCK ON ONE SETTING, OR DISPLAYS --F, OR
SOME OR ALL INOPERATIVE

POSSIBLE CAUSES

CHECK CODE(S) PRESENT

AUTOMATIC TEMPERATURE CONTROL

BODY CONTROL MODULE

AUTOMATIC TEMPERATURE CONTROL

BODY CONTROL MODULE

AUTOMATIC TEMPERATURE CONTROL

FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN

GROUND CIRCUIT(S) OPEN

AUTOMATIC TEMPERATURE CONTROL

TEST

ACTION

APPLICABILITY

Turn the ignition on.
With the DRBIII

t, record and erase Body Computer DTC’s.

Cycle the ignition switch.
With the DRBIII

t, read the Body Computer DTCs.

Does the DRBIII

t display any DTCs?

All

Yes

→ Refer to the appropriate category for the related symptom(s).

Perform BODY VERIFICATION TEST - VER 1.

→ Go To 2

Which symptom is present?

All

ATC Panel displays --F

Go To

Some VF Segmnts/LEDs fail to illuminate

Go To

Dsply won’t change when pressing buttons

Go To

All VF Segmnts & LEDs fail to illuminate

Go To

340

HEATING & A/C

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