Chrysler Pacifica. Manual — part 156
TEST
ACTION
APPLICABILITY
4
Turn the ignition on.
With the DRBIII
t in ATC, Monitor Display, PCI Bus Messages, look for the following
message:
9VF DIM MSG PRESENT:9
Does the DRBIII
t display: VF DIM MSG PRESENT: YES?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Body Control Module (BCM) in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
621
HEATING & A/C
VF DIMMING MESSAGE MISSING (ACTIVE) - ATC —
Continued
Symptom:
VIN MESSAGE MISSING (ACTIVE) - ATC
When Monitored and Set Condition:
VIN MESSAGE MISSING (ACTIVE) - ATC
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC will set if the Automatic Temperature Control (ATC) does not
receive the VIN message from the Powertrain Control Module (PCM) for more than 16
seconds.
POSSIBLE CAUSES
NO COMMUNICATION WITH POWERTRAIN CONTROL MODULE (PCM)
POWERTRAIN CONTROL MODULE (PCM) DTC(S) PRESENT
AUTOMATIC TEMPERATURE CONTROL (ATC)
POWERTRAIN CONTROL MODULE (PCM)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the active ATC DTCs.
Does the DRBIII
t display: NO COMMUNICATION WITH PCM?
All
Yes
→ Return to the Heating & A/C symptom list and choose the
symptom.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition on.
With the DRBIII
t, read PCM DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Refer to the Powertrain Diagnostic Information for the related
symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition on.
With the DRBIII
t in Monitor Display, PCI Bus Messages, look for the following
message:
9VIN MSG PRESENT:9
Does the DRBIII
t display: VIN MSG PRESENT: YES?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Powertrain Control Module (PCM) in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
622
HEATING & A/C
Symptom:
*A/C HEATER CONTROL ILLUMINATION INOPERATIVE - MTC
POSSIBLE CAUSES
ACTIVE HVAC DTC(S) PRESENT
INSTRUMENT CLUSTER (EMIC) DTC(S) PRESENT
A/C HEATER CONTROL
PANEL LAMPS DRIVER CIRCUIT OPEN
INSTRUMENT CLUSTER (EMIC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read active HVAC DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Return to the Heating & A/C symptom list and choose the
symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition on.
With the DRBIII
t, read Instrument Cluster DTCs.
Does DRBIII
t display any DTCs?
All
Yes
→ Refer to the Instrument Cluster category for the related symp-
tom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Rotate the Panel Lamps Dimmer switch to the off position.
Disconnect the A/C Heater Control C1 harness connector.
Turn the park lamps on.
Measure the voltage of the Panel Lamps Driver circuit while rotating the Panel
Lamps Dimmer switch from the off position to the full brightness position.
Does the voltage change from approximately 4.5 volts to 11.5 volts?
All
Yes
→ Replace the A/C Heater Control in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
623
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance of the Panel Lamps Driver circuit between the A/C Heater
Control C1 harness connector and the Instrument Cluster C1 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Instrument Cluster (EMIC) in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Panel Lamps Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
624
HEATING & A/C
*A/C HEATER CONTROL ILLUMINATION INOPERATIVE - MTC —
Continued
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