Chrysler Pacifica. Manual — part 166
Symptom:
*REAR BOOSTER FAN REAR CONTROL SWITCH ON INDICATOR
INOPERATIVE - ATC
POSSIBLE CAUSES
REAR BOOSTER FAN REAR CONTROL SWITCH
REAR FAN ON INDICATOR DRIVER CIRCUIT SHORTED TO GROUND
REAR FAN ON INDICATOR DRIVER CIRCUIT OPEN
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Turn the ignition on.
Press the REAR fan mode switch on.
Measure the voltage of the Rear Fan On Indicator Driver circuit.
Is the voltage between 7 and 9 volts?
All
Yes
→ Replace the Rear Booster Fan Rear Control Switch in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance between ground and the Rear Fan On Indicator Driver
circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the Rear Fan On Indicator Driver circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance of the Rear Fan On Indicator Driver circuit between the ATC
C2 harness connector and the Rear Booster Fan Rear Control Switch harness
connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Rear Fan On Indicator Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
661
HEATING & A/C
Symptom:
*REAR BOOSTER FAN RUNS AT ONLY ONE SPEED - ATC
POSSIBLE CAUSES
AUTOMATIC TEMPERATURE CONTROL (ATC) DTC(S) PRESENT
REAR BOOSTER FAN CONTROL CIRCUIT SHORTED TO GROUND
AUTOMATIC TEMPERATURE CONTROL (ATC)
REAR BOOSTER FAN POWER MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
Press the ATC’s PWR switch on.
Press the REAR fan mode switch on, so that it is in manual mode. The word
9REAR9
should display on the ATC display panel. The word
9AUTO9 should not be displayed.
Turn the Rear Booster Fan Rear Control switch to AUTO for 30 seconds, then slowly
turn it from AUTO to high speed and then back to AUTO.
With the DRBIII
t, read the active ATC 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 off.
Disconnect the Rear Booster Fan Power Module C1 harness connector.
Disconnect the ATC C1 harness connector.
Measure the resistance between ground and the Rear Booster Fan Control circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the Rear Booster Fan Control circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
662
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Reconnect all previously disconnected components.
Connect the DRBIII
t X10 Scope Probe CH7061 to the DRBIIIt.
Select the following from the DRBIII
t menu: PEP Module Tools; Lab Scope; Live
Data; and Lab Scope.
Set the time to 10ms/Div.
Set the voltage range to +20.0v.
Set the offset to 4.00v.
Set the Probe to X10.
Start the engine.
Press the ATC’s PWR switch on.
Press the REAR fan mode switch on, so that it is in manual mode. The word
9REAR9
should display on the ATC display panel. The word
9AUTO9 should not be displayed.
Using the X10 Scope Probe, back probe the Rear Booster Fan Control circuit in the
ATC C1 harness connector.
NOTE: The RR Booster Fan Power Module provides a 12.0v signal to the ATC
over the Rear Booster Fan Control circuit. The ATC provides a variable duty
cycle ground to the 12.0v signal based on input from the Rear Booster Fan
Rear Control switch.
NOTE: When the fan speed is set to low, the ATC provides a short duty cycle
(less time grounding the signal voltage).
NOTE: As higher fan speeds are requested, the ATC increases the duty cycle
(more time grounding the signal voltage).
NOTE: When the highest fan speed is requested, the duty cycle increases to
where the signal pattern is almost a flat line (with brief voltage spikes).
Set the fan speed to low, then slowly raise the fan speed to high while observing the
DRBIII
t display.
The voltage on the scope patten should cycle from approximately 0 volts (duty cycle
on) to 12.0 volts (duty cycle off) for all fan speeds.
The duty cycle pattern should change smoothly as the fan speed changes from low to
high.
Does the DRBIII
t display the voltage range and duty cycle as described above?
All
Yes
→ Replace the Rear Booster Fan Power Module in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
663
HEATING & A/C
*REAR BOOSTER FAN RUNS AT ONLY ONE SPEED - ATC —
Continued
Symptom:
*REAR MODE DOOR INOPERATIVE - ATC
POSSIBLE CAUSES
REAR MODE DOOR DRIVER CIRCUIT SHORTED HIGH
REAR MODE DOOR DRIVER CIRCUIT SHORTED LOW
REAR MODE DOOR DRIVER CIRCUITS SHORTED TOGETHER
REAR MODE DOOR ACTUATOR
REAR MODE DOOR DRIVER (A) CIRCUIT OPEN
REAR MODE DOOR DRIVER (B) CIRCUIT OPEN
REAR MODE DOOR ACTUATOR
AUTOMATIC TEMPERATURE CONTROL (ATC)
REAR MODE DOORS/LINKAGE BINDING, DISCONNECTED, MISSING, BROKEN, OR WARPED
REAR MODE DOOR ACTUATOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Turn the ignition on.
Measure the voltage between the Rear Mode Door Driver (A) circuit and ground.
Measure the voltage between the Rear Mode Door Driver (B) circuit and ground.
Is the voltage above 0.2 volts on either circuit?
All
Yes
→ Repair the Rear Mode Door Driver circuit with voltage above 0.2
volts for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Measure the resistance between the Rear Mode Door Driver (A) circuit and the Rear
Mode Door Driver (B) circuit.
What is the resistance?
All
Below 30.0 ohms
Above 70.0 ohms
30.0 to 70.0 ohms
664
HEATING & A/C
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