2002 Chrysler Town and Country blower

Tiny
SONNY1111
  • MEMBER
  • 2002 CHRYSLER TOWN AND COUNTRY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 80,000 MILES
Why dont my blower work what is wrong
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Tuesday, August 19th, 2008 AT 1:51 PM

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Tiny
MERLIN2021
  • EXPERT
BODY CONTROL MODULES -2002 Chrysler Town & Country LXi
Page 1 of 4

NOTE: After making any repairs, perform BODY VERIFICATION TEST under VERIFICATION TESTS.
Front Blower Motor Inoperative
1.With the DRBIII(R) in FCM, read the active DTCs. If there are any active FCM DTCs present that are related to the blower relay circuits, refer to the manual temperature control section of the DIAGNOSTIC TROUBLE CODE IDENTIFICATION table. For all other FCM DTCs, refer to the DIAGNOSTIC TROUBLE CODE IDENTIFICATION table. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION table. With the DRBIII(R), reset the ATC after repair/replacement is complete. If there are no active FCM DTCs present, go to the next step. 2.Turn the ignition off. Remove and inspect Intelligent Power Module (IPM) Fuse No. 10. If the fuse is open, go to the next step. If the fuse is not open, go to step 6. 3.Replace IPM Fuse No. 10. Turn the ignition on. Operate the blower motor in all speeds. Start the engine and operate the ATC system in all modes and speeds. If the blower motor operates properly without blowing the fuse, refer to the wiring diagrams to help isolate a possible intermittent short to ground condition. See WIRING DIAGRAMS. With the DRBIII(R), reset the ATC after repair/replacement is complete. If the blower motor does not operate properly without blowing the fuse, go to the next step. 4.Turn the ignition off. Disconnect the Front Blower Power Module C1 harness connector. See Fig. 14. Measure the resistance between ground and the Fused Front Blower Motor Relay Output circuit. If the resistance is below 10K ohms, repair the Fused Front Blower Motor Relay Output circuit for a short to ground. Replace IPM Fuse No. 10. With the DRBIII(R), reset the ATC after repair/replacement is complete. If the resistance is above 10K ohms, go to the next step. 5.Turn the ignition off. Replace IPM Fuse No. 10. Disconnect the Front Blower Power Module C1 harness connector. Disconnect the Front Blower Power Module C2 harness connector. See Fig. 14. Connect a jumper wire between the Fused Front Blower Motor Relay Output circuit in the Front Blower Power Module C1 harness connector and the Dark Blue wire in the Front Blower Power Module C2 harness connector. Connect a jumper wire between the Ground circuit in the Front Blower Power Module C1 harness connector and the Dark Blue/Yellow wire in the Front Blower Power Module C2 harness connector. Turn the ignition on. If the Blower Motor operates at full speed without blowing the fuse, replace the Front Blower Power Module. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in HVAC. Replace IPM Fuse No. 10. With the DRBIII(R), reset the ATC after repair/replacement is complete. If the Blower Motor does not operate at full speed without blowing the fuse, replace the Blower Motor. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in HVAC. Replace IPM Fuse No. 10. With the DRBIII(R), reset the ATC after repair/replacement is complete.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
6.Ensure IPM Fuse No. 10 is installed. Disconnect the Front Blower Power Module C1 harness connector. See Fig. 14. Turn the ignition on. Using a 12-volt test light connected to ground, back probe the Fused Front Blower Motor Relay Output circuit in the Front Blower Power Module C1 harness connector. If the test light illuminates brightly, go to the next step. If the test light does not illuminate brightly, go to step 13. 7.Turn the ignition off. Disconnect the Front Blower Power Module C1 harness connector. See Fig. 14. Measure the resistance between ground and the Ground circuit. If the resistance is below 5

8/19/2008
BODY CONTROL MODULES -2002 Chrysler Town & Country LXi
Page 2 of 4
ohms, go to the next step. If the resistance is above 5 ohms, repair the Ground circuit for an open. With the DRBIII(R), reset the ATC after repair/replacement is complete. 8.Turn the ignition off. Disconnect the Front Blower Power Module C1 harness connector. See Fig. 14. Disconnect the Automatic Temperature Control Module C2 harness connector. See Fig. 50. Turn the ignition on. Measure the voltage of the Blower Motor Control circuit. Is there any voltage present? If any voltage is present, repair the Blower Motor Control circuit for a short to voltage. With the DRBIII(R), reset the ATC after repair/replacement is complete. Perform BODY VERIFICATION TEST. If No voltage is present, go to next step. 9.Turn the ignition off. Disconnect the Front Blower Power Module C1 harness connector. See Fig. 14. Disconnect the Automatic Temperature Control Module C2 harness connector. See Fig. 50. Measure the resistance of the Blower Motor Control circuit between the Front Blower Power Module C1 harness connector and the Automatic Temperature Control Module C2 harness connector. If the resistance is below 5 ohms, go to the next step. If the resistance is above 5 ohms, repair the Blower Motor Control circuit for an open. With the DRBIII(R), reset the ATC after repair/replacement is complete. 10.Turn the ignition off. Make sure that the Front Blower Power Module C1 harness connector is connected to the Front Blower 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 blower switch to the LO speed position. While back probing, measure the voltage of the Blower Motor Control circuit in the Automatic Temperature Control Module C2 harness connector. If the voltage is above 10 volts, go to the next step. If the voltage is below 10 volts, replace the Front Blower Power Module. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in HVAC. With the DRBIII(R), reset the ATC after repair/replacement is complete.
NOTE: The Blower Power Module provides a 10 volt signal to the ATC Module over the Blower Motor Control circuit. The ATC Module provides a variable duty cycle ground to the 10 volt signal based on input from the blower control switch.
NOTE: When the blower control 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 blower control switch reaches HI speed, the duty cycle increases to where the signal pattern is almost a flat line (with brief voltage spikes).
11.Turn the ignition off. Reconnect all previously disconnected components. Connect the DRBIII(R) X10 Scope Probe CH7061 to Channel 1 on the DRBIII(R). Select the following from the DRBIII (R) 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 +20v. 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. Using the X10 Scope Probe, back probe the Blower Motor Control circuit in the Front Blower Power Module C1 harness connector. Set the blower switch to LO speed then slowly

8/19/2008
BODY CONTROL MODULES -2002 Chrysler Town & Country LXi
Page 3 of 4
move it to HI speed while observing the DRBIII(R) display. The voltage on the scope pattern should cycle from approximately 2 volts (duty cycle on) to 10 volts (duty cycle off) for all blower speeds. The duty cycle pattern should change smoothly as the 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. If the DRBIII(R) displays the voltage range and duty cycle as described above, go to the next step. If the DRBIII(R) does not display the voltage range and duty cycle as described above, replace the Automatic Temperature Control Module. See A/C-HEATER CONTROL PANEL under REMOVAL & INSTALLATION. With the DRBIII(R), reset the ATC after repair/replacement is complete. 12.Turn the ignition off. Disconnect the Front Blower Power Module C1 harness connector. Disconnect the Front Blower Power Module C2 harness connector. See Fig. 14. Connect a jumper wire between the Fused Front Blower Motor Relay Output circuit in the Front Blower Power Module C1 harness connector and the Dark Blue wire in the Front Blower Power Module C2 harness connector. Connect a jumper wire between the Ground circuit in the Front Blower Power Module C1 harness connector and the Dark Blue/Yellow wire in the Front Blower Power Module C2 harness connector. Turn the ignition on. If the Blower Motor operates at full speed, replace the Front Blower Power Module. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in HVAC. With the DRBIII(R), reset the ATC after repair/replacement is complete. If the Blower Motor does not operate at full speed, replace the Blower Motor. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in HVAC. With the DRBIII(R), reset the ATC after repair/replacement is complete.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
13.Turn the ignition off. Remove the Front Blower Motor Relay from the IPM. Using a 12-volt test light connected to ground, probe cavity No. 30 of the Front Blower Motor Relay connector. If the test light illuminates brightly, go to the next step. If the test light does not illuminate brightly, replace the IPM. With the DRBIII(R), reset the ATC after repair/replacement is complete. 14.Turn the ignition off. Remove the Front Blower Motor Relay from the IPM. Remove IPM Fuse No. 10. Measure the resistance between cavity No. 87 of the Front Blower Motor Relay connector and IPM Fuse No. 10 (power input cavity). If the resistance is below 5 ohms, go to the next step. If the resistance is above 5 ohms, replace the IPM. With the DRBIII(R), reset the ATC after repair/replacement is complete.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
15.Turn the ignition off. Make sure that the Front Blower Motor Relay is installed. Remove IPM Fuse No. 10. Turn the ignition on. Using a 12-volt test light connected to ground, probe IPM Fuse No. 10 (power input cavity). If the test light illuminates brightly, go to the next step. If the test light does not illuminate brightly, replace the Front Blower Motor Relay. With the DRBIII(R), reset the ATC after repair/replacement is complete. 16.Turn the ignition off. Remove IPM Fuse No. 10. Disconnect the IPM C6 harness connector. See Fig. 33. Measure the resistance between IPM Fuse No. 10 (power output cavity) and cavity No. 7 of the IPM C6 connector (IPM side). If the resistance is below 5 ohms, repair the Fused Front Blower Motor Relay Output circuit for an open. With the DRBIII(R), reset the ATC after repair/replacement is complete. If the resistance is above 5 ohms, replace the IPM. With the DRBIII(R), reset the ATC after repair/replacement is complete.

8/19/2008
BODY CONTROL MODULES -2002 Chrysler Town & Country LXi
Page 4 of 4
Fig. 14: Identifying Front Blower Power Module Connectors
Courtesy of DAIMLERCHRYSLER CORP.

8/19/2008


http://www.2carpros.com/forum/automotive_pictures/62217_Blower_3.jpg

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Tuesday, August 19th, 2008 AT 2:10 PM

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