Chrysler Voyager. Manual — part 212
TEST
ACTION
APPLICABILITY
3
Replace IPM Fuse #12.
Turn the ignition on.
Operate the blower motor in all speeds.
Start the engine and operate the ATC system in all modes and speeds.
Does the blower motor operate properly without blowing the fuse?
All
Yes
→ Refer to the wiring diagrams located in the service information to
help isolate a possible intermittent short to ground condition.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Rear Blower Motor Power Module C1 harness connector.
Measure the resistance between ground and the Fused Rear Blower Relay Output
circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the Fused Rear Blower Relay Output circuit for a short to
ground. Replace IPM Fuse #12.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Replace IPM Fuse #12.
Disconnect the Rear Blower Motor Power Module C1 harness connector.
Disconnect the Rear Blower Motor Power Module C2 harness connector.
Connect a jumper wire between the Fused Rear Blower Relay Output circuit in the
Rear Blower Motor Power Module C1 harness connector and the Power Feed circuit
in the Rear Blower Motor Power Module C2 harness connector.
Connect a jumper wire between the Ground circuit in the Rear Blower Motor Power
Module C1 harness connector and the Ground circuit in the Rear Blower Motor
Power Module C2 harness connector.
Turn the ignition on.
Does the Blower Motor operate at full speed without blowing the fuse?
All
Yes
→ Replace the Rear Blower Motor Power Module in accordance with
the Service Information. Replace IPM Fuse #12.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Blower Motor in accordance with the Service Infor-
mation. Replace IPM Fuse #12.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
6
Ensure IPM Fuse #12 is installed.
Disconnect the Rear Blower Motor Power Module C1 harness connector.
Turn the ignition on.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Using a 12-volt test light connected to ground, back probe the Fused Rear Blower
Relay Output circuit in the Rear Blower Motor Power Module C1 harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 7
No
→ Go To 13
275
AUTOMATIC TEMPERATURE CONTROL
*REAR BLOWER MOTOR INOPERATIVE —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the Rear Blower Motor Power Module C1 harness connector.
Measure the resistance between ground and the Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 8
No
→ Repair the Ground circuit for an open.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
8
Turn the ignition off.
Disconnect the Rear Blower Motor Power Module C1 harness connector.
Disconnect the Automatic Temperature Control Module C2 harness connector.
Turn the ignition on.
Measure the voltage of the Rear Blower Motor Control circuit.
Is there any voltage present?
All
Yes
→ Repair the Rear Blower Motor Control circuit for a short to
voltage.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 9
9
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 of the Rear Blower Motor Control circuit between the Rear
Blower Motor Power Module C1 harness connector and the Automatic Temperature
Control Module C2 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 10
No
→ Repair the Rear Blower Motor Control circuit for an open.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
10
Turn the ignition off.
Make sure that the Rear Blower Motor Power Module C1 harness connector is
connected to the Rear Blower Motor Power Module.
Make sure that the Automatic Temperature Control Module C2 harness connector is
connected to the Automatic Temperature Control Module.
Start the engine.
Press the ATC Power switch on.
Set the Rear System switch on the ATC module to the Rear Control position.
Set the blower switch on the Rear ATC Control panel to LO speed.
While back probing, measure the voltage of the Rear Blower Motor Control circuit in
the Automatic Temperature Control Module C2 harness connector.
Is the voltage above 10.0 volts?
All
Yes
→ Go To 11
No
→ 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.
276
AUTOMATIC TEMPERATURE CONTROL
*REAR BLOWER MOTOR INOPERATIVE —
Continued
TEST
ACTION
APPLICABILITY
11
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
→ Go To 12
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.
277
AUTOMATIC TEMPERATURE CONTROL
*REAR BLOWER MOTOR INOPERATIVE —
Continued
TEST
ACTION
APPLICABILITY
12
Turn the ignition off.
Disconnect the Rear Blower Motor Power Module C1 harness connector.
Disconnect the Rear Blower Motor Power Module C2 harness connector.
Connect a jumper wire between the Fused Rear Blower Relay Output circuit in the
Rear Blower Motor Power Module C1 harness connector and the Power Feed circuit
in the Rear Blower Motor Power Module C2 harness connector.
Connect a jumper wire between the Ground circuit in the Rear Blower Motor Power
Module C1 harness connector and the Ground circuit in the Rear Blower Motor
Power Module C2 harness connector.
Turn the ignition on.
Does the Blower Motor operate at full speed?
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 Blower Motor in accordance with the Service Infor-
mation.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
13
Turn the ignition off.
Remove the Rear Blower Motor Relay from the IPM.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Using a 12-volt test light connected to ground, probe cavity 30 of the Rear Blower
Motor Relay connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 14
No
→ Replace the IPM in accordance with the Service Information.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
14
Turn the ignition off.
Remove the Rear Blower Motor Relay from the IPM.
Remove IPM Fuse #12.
Measure the resistance between cavity 87 of the Rear Blower Motor Relay connector
and IPM Fuse #12 (power input cavity).
Is the resistance below 5 ohms?
All
Yes
→ Go To 15
No
→ Replace the IPM in accordance with the Service Information.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
278
AUTOMATIC TEMPERATURE CONTROL
*REAR BLOWER MOTOR INOPERATIVE —
Continued
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