If the car is a 99 deville, there is a compressor relay. No blower motor relay it is all solid state. The red wire that you checked for power, is off of the 50A inadvertent fuse in the left under hood fuse block. The black wire goes to G204, which is down below the instrument panel left side, behind the kick panel. And the gray wire is speed control from the A/C programmer. When you checked for power at the blower motor, did you also use the blower ground wire, or just an engine or battery ground? I don't know which relay you were sold, but there is no blower relay. If you have power and ground at the blower motor, and can verify continuity of the gray wire to the programmer. I would say you need a programmer. To validate what I have said, and to illustrate no reference to blower relay, here is the factory diagnostic chart for no blower. It is in text form, if I uploaded the illustration it would be too small to read.
Blower Motor Inoperative at Any Speed (Front)
Test Description
Performs the Diagnostic System Check before continuing with the diagnosis.
Verifies the blower operation in both normal and overide modes.
The Scan Tool displays the blower speed input voltage from the Heater and A/C Programmer to the Blower Motor Assembly. Checking for the cause in CKT 754 or the Heater and A/C Programmer output.
Repairs the main speed input to the blower motor. Data Line between the IPC and the Heater and A/C Programmer are suspect.
1 Did you perform the diagnostic system check?
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Go to Step 2
Go to Diagnostic System Check
2 Turn the key to the ON position.
With the engine running, connect the Scan Tool.
Set the blower on high (99%).
Use the Scan Tool to display the function test for the blower.
Change the blower speed. Observe the change in speed as the numbers decrease.
Did you complete the procedure?
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Go to Step 3
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3 Is the blower operation non-existent or intermittent?
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Go to Step 6
Go to Step 4
4 Does the blower speed consistently decrease at a gradual rate from 99 to approximately 30, and then stop?
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Go to Step 7
Go to Step 5
5 Is the blower speed consistent, then OFF?
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Go to Step 8
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6 Use a Scan Tool to view the blower speed.
Command the blower to the HI speed (100%).
Command the blower to the LO speed (42%).
Does the commanded value equal the actual value?
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Go to Step 10
Go to Step 9
7 The blower is operating properly.
Inspect for improper temperature control.
Did you inspect for improper temperature control?
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Go to Step 18
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8 Exit the diagnostic.
Start the engine.
Select the LO blower.
Inspect the voltage at blower connector B.
Is the voltage greater than the specified value?
9 V
Go to Step 17
Go to Step 13
9 Use the Scan Tool to view the blower speed.
Set the A/C system to 75 degrees AUTO MODE.
Increase or decrease the set temperature.
Is the blower speed (%) within the specified value?
40-100%
Go to Step 10
Go to Step 11
10 Inspect the voltage at the blower motor connector B.
Is the voltage greater than the specified value?
4 V
Go to Step 12
Go to Step 13
11 Replace the heater and A/C programmer. Refer to Programmer Replacement
Is the repair complete?
Go to Step 18
12 Disconnect the blower.
Inspect the resistance of connector C to the battery voltage.
Inspect the resistance of connector A to ground.
Is the resistance greater than the specified value?
Go to Step 14
Go to Step 15
13 Inspect CKT 754.
If CKT 754 is OK, replace the heater and A/C programmer. Refer to Programmer Replacement
Is the repair complete?
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Go to Step 18
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14 Inspect the fuse.
Repair CKT 50 or CKT 542 as required.
Is the repair complete?
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Go to Step 18
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15 Turn the key OFF.
Inspect the resistance of connector B to ground.
Is the resistance less than the specified value?
Go to Step 13
Go to Step 16
16 Replace the blower motor assembly. Refer to Blower Motor and Fan Replacement
Is the repair complete?
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Go to Step 18
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17 Set the blower speed to HI.
Does the voltage change to less than the specified value?
4 V
Go to Step 16
Go to Step 13
18 Using the Scan Tool clear the DTCs and verify the operation.
Did you clear the DTCs and verify the operation?
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Go to Diagnostic System Check
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The high side temp sensor is just above the blower connector. Open circuit relates to it being disconnected, faulty sensor, or faulty wiring to the sensor, or a faulty programmer. This was not in your original list of codes you posted, was it possibly disconnected during blower replacement.
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Friday, March 26th, 2010 AT 10:56 PM