Auxiliary Blower Motor Inoperative. Cadillac DeVille 2003

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2003 🢒 DeVille 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Auxiliary Blower Motor Inoperative

Step	Action	Yes	No
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The auxiliary blower motor is inoperative in all speed positions.
1	Did you perform the HVAC Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - HVAC Systems - Automatic
2	Turn ON the ignition, with the engine OFF. Place the auxiliary blower motor switch in each speed position. Does the auxiliary blower motor operate in any of the speed positions?	Go to Auxiliary Blower Motor Malfunction	Go to Step 3
3	Turn the ignition OFF. Disconnect the auxiliary blower motor. Turn ON the ignition, with the engine OFF. Connect a test lamp between the battery positive voltage circuit and the high blower motor control circuit of the auxiliary blower motor. Place the auxiliary blower motor switch in the maximum speed position. Does the test lamp illuminate?	Go to Step 6	Go to Step 4
4	Test the battery positive voltage circuit of the auxiliary blower motor for an open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 10	Go to Step 5
5	Test the high speed control circuit of the auxiliary blower motor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 10	Go to Step 7
6	Inspect for poor connections at the harness connector of the auxiliary blower motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 10	Go to Step 8
7	Inspect for poor connections at the harness connector of the auxiliary HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 10	Go to Step 9
8	Replace the auxiliary blower motor. Refer to Auxiliary Blower Motor Replacement in Heating Ventilation and Air Conditioning. Did you complete the replacement?	Go to Step 10	--
9	Replace the auxiliary HVAC control module. Refer to Auxiliary Heater and Air Conditioning Control Module Replacement . Did you complete the replacement?	Go to Step 10	--
10	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2