Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2250

34–EBL MODE SWITCH STUCK (MTC)

For a complete wiring diagram Refer to Section 8W.

Theory of Operation

The EBL mode switch input changes when the switch is pushed down. A stored DTC 34 indicates that the EBL
mode switch was stuck in a pushed position for more than 10 minutes, but has since returned to its normal state.
An active DTC 34 indicates that the EBL mode switch is stuck in a pushed position. An active DTC 34 will prevent
the control from performing certain diagnostic functions and it will prevent proper EBL mode switch and status indi-
cator function. For additional information about the A/C Heater Control’s on-board diagnostics, refer to 24 - HEAT-
ING & AIR CONDITIONING - DIAGNOSIS AND TESTING.

•

When Monitored:
With the ignition on.

•

Set Condition:
If the EBL mode switch stays in a pushed position for more than 10 minutes.

Possible Causes

OBJECT HOLDING EBL MODE SWITCH IN A PUSHED POSITION

SUBSTANCE CAUSING EBL MODE SWITCH TO GET STUCK IN A PUSHED POSITION

A/C HEATER CONTROL

Diagnostic Test

1.

INSPECT THE A/C HEATER CONTROL FOR DAMAGE

Inspect the A/C Heater Control for damage.

Is the A/C Heater Control damaged?

Yes

>> Replace the A/C Heater Control in accordance with the Service Information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).

No

>> Go To 2

2.

INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE EBL MODE SWITCH TO STAY OR STICK IN A
PUSHED POSITION

Inspect the A/C Heater Control for anything that would cause the EBL mode switch to stay or stick in a pushed
position.

Is anything present that would cause the EBL mode switch to stay or stick in a pushed position?

Yes

>> Repair as necessary.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).

No

>> Go To 3

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3.

CHECK FOR NORMAL EBL MODE SWITCH & STATUS INDICATOR FUNCTION

Turn the ignition on.

Press the EBL mode switch on and off several times while observing the EBL status indicator.

Does the EBL status indicator turn on and off with respect to the switch position?

Yes

>> Go To 4

No

>> Replace the A/C Heater Control in accordance with the Service Information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).

4.

CHECK A/C HEATER CONTROL OPERATION BY ATTEMPTING TO RUN THE ACTUATOR CALIBRATION
FUNCTION

If illuminated, turn off the A/C status indicator and the EBL status indicator.

Actuate the Actuator Circuit Test / Door Calibration Function by performing the following:

•

Turn the blower control off.

•

Press and hold the EBL mode switch down and then turn the blower control on. Continue to hold the EBL
mode switch down until the EBL status indicator begins flashing. Then, release the EBL mode switch.

While the test / function is running, the EBL status indicator will flash once per second. If the test / function passes,
the EBL status indicator will stop flashing. If the test / function fails, the A/C and EBL status indicators will flash
alternately.

Did the A/C Heater Control run the test / function?

Yes

>> Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL

MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).

No

>> Replace the A/C Heater Control in accordance with the Service Information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).

LX

HVAC - ELECTRICAL DIAGNOSTICS

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35–FAILED COOL DOWN (MTC)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
When the Cooldown Test is executed.

•

Set Condition:
If the A/C system is unable to lower the evaporator temperature 11.11°C (20°F).

Possible Causes

PREREQUISITES NOT MET BEFORE RUNNING THE COOLDOWN TEST

ANOTHER RELATED SYSTEM NOT FUNCTIONING CORRECTLY

POWERTRAIN SYSTEM FAULTS PRESENT

NOTE: This DTC will display as active if the ignition is not cycled after running the Cooldown Test. Other-
wise, it will display as stored until cleared.

Diagnostic Test

1.

VERIFY THAT ALL OF THE COOLDOWN TEST PREREQUISITES WERE MET

Review the list of Cooldown Test prerequisites.

•

DTC 31 or 32 must not be active.

•

The refrigerant system must be adequately charged.

•

The blower motor must operate correctly in all speeds.

•

The work area ambient temperature must be above 18.3°C (65°F).

•

The evaporator temperature must be above 18.3°C (65°F).

•

The A/C compressor must be turned off.

Were all of the prerequisites met before running the Cooldown Test?

Yes

>> Go To 2

No

>> Run the Cooldown Test again after all of the prerequisites are met. Then, if DTC 35 is still present, Go

To 2. Otherwise, perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).

2.

CHECK FOR DTCs IN THE PCM

With the scan tool, select PCM.

Are any DTCs present in the PCM?

Yes

>> Diagnose and repair the DTC(s). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) for PCM DTCs.

Run the Cooldown Test again after the repair is complete.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).

No

>> Refer to the Service Information for additional Cooldown Test related diagnostic information and testing

procedures. Run the Cooldown Test again after the repair is complete.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).

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36–EEPROM CHECKSUM ERROR (MTC)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the ignition on.

•

Set Condition:
If the calculated checksum does not match the stored value.

Possible Causes

A/C HEATER CONTROL

NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC
is stored. Refer to HVAC System Test (MTC) for stored DTC test procedures.

Diagnostic Test

1.

REPLACE THE A/C HEATER CONTROL

Repair

Replace the A/C Heater Control in accordance with the Service Information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).

LX

HVAC - ELECTRICAL DIAGNOSTICS

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