Here is the diagnostic.
TEST H: BLOWER MOTOR OPERATES CONTINUOUSLY IN HIGH SPEED
1. Turn ignition on. Press MAX A/C override button. Adjust blower speed to high speed and then to
low speed. If blower motor speed changes with changes in button positions, system is operating
normally at this time. If blower speed does not change properly, go to next step.
2. Turn ignition off. Disconnect clockspring 8-pin harness connector C220 from rear of remote
control panel. Turn ignition on. Press MAX A/C override button. Adjust blower speed to high
speed and then to low speed. If blower speed does not change properly, go to next step.
3. Turn ignition off. Disconnect blower motor speed controller 5-pin harness connector C179. Turn
ignition on. If blower motor does not run, go to next step. If blower motor runs, repair short to
ground in Orange/Black wire. Recheck system operation.
4. Turn ignition off. Connect blower motor speed controller connector. Disconnect EATC module
13-pin harness connector C298. If blower motor runs, replace blower motor speed controller.
Recheck system operation. If blower motor does not run, go to next step.
5. Turn ignition off. Disconnect blower motor speed controller 5-pin harness connector C179.
Measure resistance of Brown/Orange wire between EATC module harness connector C298
terminal No. 23 and blower motor speed controller harness connector C179 terminal No. 2. See
Fig. 3 and Fig. 10 . Measure resistance between ground and EATC module connector C298
terminal No. 23 (Brown/Orange wire). If resistance is less than 5 ohms between EATC module
harness connector and blower motor speed controller harness connector and more than 10 k/ohms
between EATC module connector and ground, go to next step. If resistance is not as specified,
repair open or short in Brown/Orange wire. Recheck system operation.
Fig 3
Fig 10
6. Measure resistance of Tan/Orange wire between EATC module harness connector C298 terminal
No. 10 and blower motor speed controller harness connector C179 terminal No. 1. Measure
resistance between ground and EATC module harness connector C297 terminal No. 10
(Tan/Orange wire). If resistance is less than 5 ohms between EATC module harness connector and
blower motor speed controller harness connector, and more than 10 k/ohms between EATC
module harness connector and ground, replace EATC module. Recheck system operation. If
resistance is not as specified, repair open or short in Tan/Orange wire. Recheck system operation.
7. Measure resistance between ground and EATC harness connector C298 terminal No. 24
(White/Pink wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms
or less, repair short to ground in White/Pink wire. Recheck system operation.
8. Measure resistance of White/Pink wire between EATC harness connector C298 terminal No. 10
and blower motor speed controller harness connector C179 terminal No. 3. If resistance is less
than 5 ohms, replace EATC module. Recheck system operation. If resistance is 5 ohms or more,
repair open or high resistance in White/Pink wire. Recheck system operation.
***I believe it is your EATC module***
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Monday, May 18th, 2009 AT 11:50 PM
