Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The auxiliary blower motor operates in at least one speed position. | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Important: The auxiliary blower motor only operates at MEDIUM and HIGH speed. When the auxiliary blower switch is placed in the lowest speed setting the air flow through the center console to the rear is provided by the primary blower motor. The air speed will vary depending on the front blower motor setting.
Does the auxiliary blower motor operate in each speed position? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 |
Does the Rear HVAC Fan Speed parameter change with each command? | Go to Step 4 | Go to Step 8 |
4 |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 6 |
5 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 7 |
6 | Test the auxiliary blower motor high speed control circuit for an open, a high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 8 |
7 | Test the auxiliary blower motor medium speed control circuit for an open, a high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 8 |
8 | Inspect for poor connections at the harness connector of the auxiliary HVAC control module. Refer to Wiring Repairs and Connector Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 10 |
9 | Inspect for poor connections at the harness connector of the auxiliary blower motor. Refer to Wiring Repairs and Connector Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 11 |
10 | Replace the auxiliary HVAC control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 12 | -- |
11 | Replace the auxiliary blower motor. Refer to Auxiliary Blower Motor Replacement . Did you complete the replacement? | Go to Step 12 | -- |
12 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |