Dodge Ram. Manual — part 93
ZONE CIRCUIT SHORTED TO GROUND
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 Blend Door Driver circuit (dual-zone).
ZONE CIRCUIT SHORTED TO IGN OR BATT
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 Blend Door Driver circuit (dual-zone).
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
369
HEATING & A/C
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE —
Continued
TEST
ACTION
APPLICABILITY
1
CAUTION: To ensure a proper diagnosis, repair all Short Too Complex
messages first, all common door driver ckt related messages next, and all
other messages 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 Actu-
ator 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
Go To
2
XXX Driver/Ckt Short to Ign or Batt
Go To
4
Short Too Complex
Go To
6
XXX Drv/Ckt Short to Gnd & to Ign or Bat
Go To
8
Act Ckt Test Pass, Overcurrent DTCs Acti
Go To
8
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.
Measure the resistance between the 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
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
370
HEATING & A/C
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE —
Continued
TEST
ACTION
APPLICABILITY
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
371
HEATING & A/C
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
NOTE: If the Actuator Circuit Test messages, displayed on the DRBIII
t,
identified which circuits are shorted together, then only measure the
resistance between those circuits. Otherwise, proceed as follows:
Measure the resistance between the Recirculation Door Driver ckt, and the Blend
Door Driver ckt, the Mode Door 1 Driver ckt, the Mode Door 2 Driver ckt, and, if
applicable, the Passenger Blend Door Driver ckt.
Measure the resistance between the Blend Door Driver ckt, and the Mode Door 1
Driver ckt, the Mode Door 2 Driver ckt, and, if applicable, the Passenger Blend Door
Driver ckt.
Measure the resistance between the Mode Door 1 Driver ckt, and the Mode Door 2
Driver ckt, and, if applicable, the Passenger Blend Door Driver ckt.
Measure the resistance between the Mode Door 2 Driver ckt and, if applicable, the
Passenger Blend Door Driver ckt.
Is the resistance below 10K ohms on any of the circuits?
All
Yes
→ Repair the door driver circuits with a resistance below 10K ohms
for a short together.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 9
9
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
Measure the resistance between the Common Door Driver circuit and each of the
remaining door driver circuits.
Is the resistance below 30.0 ohms on any of the circuits?
All
Yes
→ Go To 10
No
→ Go To 11
10
Turn the ignition off.
Disconnect the A/C - Heater Control C1 harness connector.
Disconnect all door actuator harness connectors whose circuit resistance was below
30.0 ohms.
Measure the resistance between the Common Door Driver circuit and each applicable
door driver circuit.
Is the resistance below 10K ohms on any of the circuits?
All
Yes
→ Repair the door driver circuits with a resistance below 10K ohms
for a short to the Common Door Driver circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace all door actuators with a resistance below 30.0 ohms in
accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
372
HEATING & A/C
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE —
Continued
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