Chrysler RG Voyager. Manual — part 109
Symptom:
*REAR BLOWER RUNS AT ONLY ONE SPEED
POSSIBLE CAUSES
REAR BLOWER MOTOR CONTROL CIRCUIT SHORTED TO GROUND
AUTOMATIC TEMPERATURE CONTROL MODULE
REAR BLOWER MOTOR POWER MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Rear Blower Motor Power Module C1 harness connector.
Disconnect the Automatic Temperature Control Module C2 harness connector.
Measure the resistance between ground and the Rear Blower Motor Control circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the Rear Blower Motor Control circuit for a short to
ground.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
405
AUTOMATIC TEMPERATURE CONTROL
TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
Reconnect all previously disconnected components.
Connect the DRBIII
t X10 Scope Probe CH7061 to Channel 1 on the DRBIIIt.
Select the following from the DRBIII
t menu: PEP Module Tools; Lab Scope; Live
Data; and Lab Scope.
Press F2 and then press Enter.
Using the left/right arrow keys, set the time to 10ms/Div.
Press F2.
Using the up/down arrow keys, set the voltage range to +20.0v.
Press Enter to move the cursor to Probe.
Using the up/down arrow keys, set the Probe to X10.
Press F2.
Start the engine.
Press the ATC Power switch on.
Set the Rear System switch on the ATC module to the Rear Control position.
Using the X10 Scope Probe, back probe the Rear Blower Motor Control circuit in the
Automatic Temperature Control Module C2 harness connector.
NOTE: The Rear Blower Motor Power Module provides a 10.0 volt signal to
the ATC Module over the Rear Blower Motor Control circuit. The ATC
Module provides a variable duty cycle ground to the 10.0 volt signal based
on input from the Rear Blower switch.
NOTE: When the Rear Blower switch is set to LO speed, the ATC Module
provides a short duty cycle (less time grounding the signal voltage).
NOTE: As higher blower speeds are requested, the ATC Module increases
the duty cycle (more time grounding the signal voltage).
NOTE: When the Rear Blower switch reaches HI speed, the duty cycle
increases to where the signal pattern is almost a flat line (with brief voltage
spikes).
Set the blower switch on the Rear ATC Control panel to LO speed then slowly move
it to HI speed while observing the DRBIII
t display.
The voltage on the scope patten should cycle from approximately 2.0 volts (duty cycle
on) to 10.0 volts (duty cycle off) for all blower speeds.
The duty cycle pattern should change smoothly as the Rear Blower switch is turned
from LO to HI.
The duty cycle on time should change from approximately 8 ms at LO speed, to 15 ms
at medium speed, and to 25 ms at HI speed.
Does the DRBIII
t display the voltage range and duty cycle as described above?
All
Yes
→ Replace the Rear Blower Motor Power Module in accordance with
the Service Information.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Automatic Temperature Control Module in accor-
dance with the Service Information.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
406
AUTOMATIC TEMPERATURE CONTROL
*REAR BLOWER RUNS AT ONLY ONE SPEED —
Continued
Symptom List:
A. CABIN HEATER PRE-TEST
CABIN HEATER CONTROL CIRCUIT OPEN (STORED)
CABIN
HEATER
CONTROL
CIRCUIT
SHORT
TO
BATTERY
(STORED)
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be A. CABIN HEATER PRE-TEST.
When Monitored and Set Condition:
CABIN HEATER CONTROL CIRCUIT OPEN (STORED)
When Monitored:
When the DCHA system is off.
Set Condition:
The DCHA Low Side Driver inside the FCM expects to see a system
voltage of 13.8 volts through the DCHA relay coil when the DCHA system is off. This DTC
will set if the FCM sees a voltage below 3.5 volts on the Cabin Heater Assist Control circuit
during this time.
CABIN HEATER CONTROL CIRCUIT SHORT TO BATTERY (STORED)
When Monitored:
During DCHA activation and operation.
Set Condition:
This DTC will set if the FCM sees between 5.0 and 15.0 volts on the Cabin
Heater Assist Control circuit.
POSSIBLE CAUSES
NO RESPONSE FROM CABIN HEATER MODULE
DTC(S) PRESENT
CABIN HEATER INOPERABLE FROM A/C - HEATER MODULE (MTC)
CABIN HEATER INOPERABLE FROM AUTO TEMP CONTROL (ATC)
STORED DCHA DTC(S) TEST COMPLETE
407
CABIN HEATER
TEST
ACTION
APPLICABILITY
1
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA’s EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN
PERSONAL INJURY OR DEATH.
CAUTION: When using a powered exhaust ventilation system, do not attach
the exhaust ventilation hose directly to the DCHA exhaust pipe. Too much
suction can prevent DCHA operation.
When using a powered exhaust ventilation system, affix the ventilation hose to the
DCHA exhaust pipe or to the vehicle in such a manor that the end of the ventilation
hose remains approximately three inches away from the end of the DCHA exhaust
pipe.
When using a non-powered exhaust ventilation system, affix the ventilation hose
directly to the DCHA exhaust pipe.
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the Cabin Heater Module.
Does the DRBIII
t display: No Response From Cabin Heater Module?
All
Yes
→ Refer to Communication for the related symptom.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
No
→ Go To 2
2
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA’s EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN
PERSONAL INJURY OR DEATH.
Turn the ignition on.
With the DRBIII
t, read Cabin Heater DTCs.
Is DTC B1813 Heater In Lockout Mode present?
All
Yes
→ Go To 3
No
→ Go To 4
3
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA’s EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN
PERSONAL INJURY OR DEATH.
Start the engine.
Allow the engine to idle.
Turn the ATC’s or MTC’s Power switch on.
Turn the Blower control to the high speed position.
On MTC, set the Blend control to the max heat position.
On ATC, set the Driver temperature control to HI (max heat).
Remove Cabin Heater Fuse #15 from the IPM for a minimum of five seconds, then
reinstall the fuse. The DCHA may attempt to start.
Turn the Blower control off and turn the ATC’s or MTC’s Power switch off.
Turn the engine off.
View repair
All
Repair
408
CABIN HEATER
A. CABIN HEATER PRE-TEST —
Continued
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