Chrysler Town, Dodge Caravan. Manual — part 820
COMMON DRIVER SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Common Door Driver circuit.
MODE CIRCUIT SHORTED TO GROUND - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short low on the
Mode Door Driver circuit.
MODE CIRCUIT SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Mode Door Driver circuit.
REAR BLEND CIRCUIT SHORTED TO GROUND - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short low on the
Rear Blend Door Driver circuit.
REAR BLEND CIRCUIT SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Rear Blend Door Driver circuit.
REAR MODE CIRCUIT SHORTED TO GROUND - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short low on the
Rear Mode Door Driver circuit.
REAR MODE CIRCUIT SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Rear Mode Door Driver circuit.
RECIRC CIRCUIT SHORTED TO GROUND - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short low on the
Recirculation Door Driver circuit.
516
HEATING & A/C
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE - MTC —
Continued
RECIRC CIRCUIT SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Recirculation Door Driver circuit.
SHORT TOO COMPLEX - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects more than three
drivers being shorted in the same direction (for example, four drivers, all shorted to
ground) or if two or more drivers are shorted with at least one driver shorted to
ignition/battery and one driver shorted to ground.
ZONE CIRCUIT SHORTED TO GROUND - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short low on the
Driver (Zone) Blend Door Driver circuit.
ZONE CIRCUIT SHORTED TO IGN OR BATT - MTC
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Driver (Zone) Blend Door Driver circuit.
POSSIBLE CAUSES
DOOR DRIVER CIRCUIT SHORTED LOW
DOOR ACTUATOR SHORTED
DOOR DRIVER CIRCUIT SHORTED HIGH
A/C - HEATER CONTROL MODULE
INTERMITTENT WIRING PROBLEM
DOOR DRIVER CIRCUITS SHORTED HIGH
DOOR DRIVER CIRCUITS SHORTED LOW
DOOR DRIVER CIRCUITS SHORTED TOGETHER
DOOR DRIVER CIRCUITS SHORTED TO COMMON DOOR DRIVER CIRCUIT
DOOR ACTUATORS SHORTED
A/C - HEATER CONTROL MODULE
INTERMITTENT WIRING PROBLEM
517
HEATING & A/C
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE - MTC —
Continued
TEST
ACTION
APPLICABILITY
1
CAUTION: Shorted rear door driver circuits can cause additional Actuator
Circuit Test messages to set for circuits where no condition exists to cause
a fault.
CAUTION: To ensure a proper diagnosis, repair all Short Too Complex
messages first, all rear door driver ckt related msgs second, all common
door driver ckt related msgs third, and all front door driver ckt related
msgs last.
CAUTION: The DRBIII
t can display up to three Actuator Circuit Test
messages at a time. After repairing each Actuator Circuit Test message,
cycle the ignition switch, then rerun the Actuator Circuit Test to ensure no
new messages exist.
CAUTION: If Overcurrent DTCs are active and the DRBIII
t displays
Actuator Circuit Test Passed, proceed to Act Ckt Test Pass, Overcurrent
DTCs Activ when asked Which Actuator Circuit Test Message Is Present.
Which Actuator Circuit Test message is present?
All
XXX Driver/Ckt Short to Gnd
XXX Driver/Ckt Short to Ign or Batt
Short Too Complex
XXX Drv/Ckt Short to Gnd & to Ign or Bat
Act Ckt Test Pass, Overcurrent DTCs Acti
2
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
Measure the resistance between ground and the applicable door driver circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the door driver circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
For a door actuator in the front A/C - heater housing assembly, measure the
resistance between the Common Door Driver circuit and the applicable door driver
circuit.
For a door actuator in the rear A/C - heater housing assembly, measure the resistance
between the Rear Common Door Driver circuit and the applicable door driver circuit.
Is the resistance below 30.0 ohms?
All
Yes
→ Replace the door actuator in accordance with the Service Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
518
HEATING & A/C
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE - MTC —
Continued
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage between the applicable door driver circuit and ground.
Is there any voltage present?
All
Yes
→ Repair the door driver circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Ensure that the A/C - Heater Control C1 harness connector is connected to the A/C
- Heater Control Module.
Turn the ignition on.
With the DRBIII
t in HVAC, System Tests, actuate the Actuator Circuit Test.
What message does the DRBIII
t display?
All
Same msg as from start of test
Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Different msg than from start of test
Using the wiring diagram as a guide, inspect the wiring &
connectors for conditions causing an intermittent short that set
the original test msg. Repair as necessary. If DRB displays a msg
for a different door driver ckt, return to Test 1 of this Symptom.
Perform BODY VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage between each of the door driver circuits and ground.
Is there any voltage present on any of the circuits?
All
Yes
→ Repair all door driver circuits with voltage present for a short to
voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
Measure the resistance between ground and each of the door driver circuits.
Is the resistance below 10K ohms on any of the circuits?
All
Yes
→ Repair all door driver circuits with a resistance below 10K ohms
for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 8
519
HEATING & A/C
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE - MTC —
Continued
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