Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2296
B100A–RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW (ATC)
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The switch input changes when the switch is pushed down. A stored DTC B100A indicates that the Recirculation
mode switch was stuck in a pushed position for more than 10 minutes, but has since returned to its normal state.
An active DTC B100A indicates that the Recirculation mode switch is stuck in a pushed position. An active DTC
B100A will prevent proper Recirculation mode switch and status indicator function.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the Recirculation mode switch stays in a pushed position for more than 10 minutes.
Possible Causes
OBJECT HOLDING RECIRCULATION MODE SWITCH IN A PUSHED POSITION
SUBSTANCE CAUSING RECIRCULATION 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 RECIRCULATION MODE SWITCH TO STAY OR
STICK IN A PUSHED POSITION
Inspect the A/C Heater Control for anything that would cause the Recirculation mode switch to stay or stick in a
pushed position.
Is anything present that would cause the Recirculation mode switch to stay or stick in a pushed posi-
tion?
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
3.
CHECK FOR NORMAL RECIRCULATION MODE SWITCH & STATUS INDICATOR FUNCTION
Turn the ignition on.
Set the Mode control to any position between Panel and Floor.
Press the Recirculation mode switch on and off several times while observing the Recirculation status indicator.
Does the Recirculation status indicator turn on and off?
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).
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HVAC - ELECTRICAL DIAGNOSTICS
LX
4.
VERIFY THAT DTC B100A–RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW IS STILL ACTIVE
With the scan tool, erase HVAC DTCs.
Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait 10 minutes before proceeding.
With the scan tool, read HVAC DTCs.
Does the scan tool display active: B100A–RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW?
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
>> Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
LX
HVAC - ELECTRICAL DIAGNOSTICS
24 - 219
B105B–RECIRCULATION DOOR CONTROL CIRCUIT OPEN (ATC)
For a complete wiring diagram Refer to Section 8W.
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HVAC - ELECTRICAL DIAGNOSTICS
LX
•
When Monitored:
When actuator movement is requested.
•
Set Condition:
If the (C268) Recirculation Door Driver circuit or the (C68) Recirculation Door Common Driver circuit is open.
Possible Causes
(C268) RECIRCULATION DOOR DRIVER CIRCUIT OPEN
(C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT OPEN
RECIRCULATION DOOR ACTUATOR
A/C HEATER CONTROL
Diagnostic Test
1.
CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE DTCs
Turn the ignition on.
With the scan tool, read active HVAC DTCs.
Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE DTCs?
Yes
>> Diagnose and repair the DTC(s). Refer to the Table of Contents in this Section for a complete list of all
HVAC related symptoms.
No
>> Go To 2
2.
CHECK THE RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE
Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Measure the resistance between the (C268) Recirculation Door Driver
circuit and the (C68) Recirculation Door Common Driver circuit in the
A/C Heater Control C2 harness connector.
Is the resistance above 70.0 ohms?
Yes
>> Go To 3
No
>> Replace the A/C Heater Control in accordance with the Ser-
vice Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MODULES/
FRONT CONTROL MODULE - DIAGNOSIS AND TEST-
ING).
LX
HVAC - ELECTRICAL DIAGNOSTICS
24 - 221
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