Chrysler Town, Dodge Caravan. Manual — part 746
Symptom List:
FRONT AND REAR BLOWER OUTPUT 1 SHORT TO BATT
FRONT AND REAR BLOWER OUTPUT 2 SHORT TO BATT
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be FRONT AND REAR BLOWER
OUTPUT 1 SHORT TO BATT.
When Monitored and Set Condition:
FRONT AND REAR BLOWER OUTPUT 1 SHORT TO BATT
When Monitored:
With the ignition on.
Set Condition:
The FCM detects excessive current when attempting to close the Front/
Rear Blower Motor Relays.
FRONT AND REAR BLOWER OUTPUT 2 SHORT TO BATT
When Monitored:
With the ignition on.
Set Condition:
The FCM detects excessive current when attempting to close the Front/
Rear Blower Motor Relays.
POSSIBLE CAUSES
FRONT & REAR BLOWER OUTPUT 1/2 SHORT TO BATT
TEST
ACTION
APPLICABILITY
1
View repair.
All
Repair
Refer to symptom Front and Rear Blower Output 1 Short to Batt
or symptom Front and Rear Blower Output 2 Short to Batt in the
Heating & A/C category.
Perform BODY VERIFICATION TEST - VER 1.
220
AUTOMATIC TEMPERATURE CONTROL
Symptom List:
FRONT IR SENSOR AND CONTROL HEAD MISMATCH (ACTIVE)
FRONT IR SENSOR CHANGE TOO LARGE (ACTIVE)
FRONT IR SENSOR HIGH (ACTIVE)
FRONT IR SENSOR LOW (ACTIVE)
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be FRONT IR SENSOR AND
CONTROL HEAD MISMATCH (ACTIVE).
When Monitored and Set Condition:
FRONT IR SENSOR AND CONTROL HEAD MISMATCH (ACTIVE)
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC is set if the correct ATC head is not paired with the correct IR
module (i.e. left hand ATC head paired with right hand IR module).
FRONT IR SENSOR CHANGE TOO LARGE (ACTIVE)
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC will set if the ATC head detects a temperature difference greater
than 50 degrees between the front IR sensors.
FRONT IR SENSOR HIGH (ACTIVE)
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC is set if the ATC reads the Front IR Sensor value and it is above
250 A/D counts.
FRONT IR SENSOR LOW (ACTIVE)
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC is set if the ATC reads the Front IR Sensor value and it is below
5 A/D counts.
POSSIBLE CAUSES
ATC REMOTE SENSOR
TEST
ACTION
APPLICABILITY
1
This DTC indicates a fault in the ATC Remote Sensor.
View repair.
All
Repair
Replace the ATC Remote Sensor.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
221
AUTOMATIC TEMPERATURE CONTROL
Symptom List:
FRONT IR SENSOR NOT CALIBRATED (ACTIVE)
FRONT KEYBOARD FAULT (ACTIVE)
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be FRONT IR SENSOR NOT
CALIBRATED (ACTIVE).
When Monitored and Set Condition:
FRONT IR SENSOR NOT CALIBRATED (ACTIVE)
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC is set if the ATC cannot read the IR sensor values or the IR
sensor values are not within a defined range of the HVAC air door motor counts.
FRONT KEYBOARD FAULT (ACTIVE)
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC will set if there is an internal fault in the ATC head.
POSSIBLE CAUSES
ATC - PROTECTED IGNITION CIRCUIT FAULT
KDB 2 CLOCK CIRCUIT SHORTED TO VOLTAGE
KDB 2 DATA CIRCUIT SHORTED TO GROUND
KDB 2 DATA CIRCUIT SHORTED TO VOLTAGE
PROTECTED IGNITION CIRCUIT OPEN
SENSOR RETURN CIRCUIT OPEN
KDB 2 CLOCK CIRCUIT SHORTED TO GROUND
KDB 2 DATA CIRCUIT OPEN
ATC - KDB 2 DATA CIRCUIT FAULT
ATC - SENSOR RETURN CIRCUIT FAULT
KDB 2 CLOCK CIRCUIT OPEN
ATC - KDB 2 CLOCK CIRCUIT FAULT
ATC REMOTE SENSOR
222
AUTOMATIC TEMPERATURE CONTROL
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the ATC Remote Sensor harness connector.
Turn the ignition on.
Measure the voltage of the Protected Ignition circuit.
Is the voltage above 10.0 volts?
All
Yes
→ Go To 2
No
→ Go To 16
2
Turn the ignition off.
Disconnect the ATC Remote Sensor harness connector.
Turn the ignition on.
Measure the voltage of the KDB 2 Data circuit.
Is the voltage above 10.0 volts?
All
Yes
→ Go To 3
No
→ Go To 13
3
Turn the ignition off.
Disconnect the ATC Remote Sensor harness connector.
Disconnect the ATC C3 harness connector.
Turn the ignition on.
Measure the voltage of the KDB 2 Data circuit.
Is the voltage above 1.0 volt?
All
Yes
→ Repair the KDB 2 Data circuit for a short to voltage.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the ATC Remote Sensor harness connector.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
Select Lab Scope.
Select Live.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the arrows to set the voltage range to 20 volts, the Offset to 4.0, and
the Probe to x10. Press F2 again and set the divisions to 40ms/Div, then press F2
again when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the KDB 2
Clock circuit in the ATC Remote Sensor harness connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
NOTE: The lab scope pattern should look similar to the example given in the
support material and cycle from approximately 0 volts to 8.0 volts.
Did the lab scope pattern and voltage react as noted above?
All
Yes
→ Go To 5
No
→ Go To 9
223
AUTOMATIC TEMPERATURE CONTROL
FRONT IR SENSOR NOT CALIBRATED (ACTIVE) —
Continued
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