Test Description
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 3: This step tests for an auxiliary blower motor that does not operate regardless of the desired blower motor speed.
- 4: This step tests for an auxiliary blower motor that operates, yet does not accurately respond to the desired blower motor speed.
- 8: The measured voltage should be near the specified value for each mode position.
Air Delivery Improper - Auxiliary
| Mode Position | Value |
|---|---|
| Vent | 0.0-1.2 V |
| Bi-Level | 2.1-4.0 V |
| Floor | 5.0-7.0 V |
| Off | B+ |
Air Delivery Improper - Auxiliary
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: Air does not flow correctly from the auxiliary air distribution outlets. |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
Go to Step 3 | Go to Auxiliary Blower Motor Malfunction |
| 3 | Place the auxiliary blower motor switch in each speed position. Does the auxiliary blower motor operate in each speed position? |
Go to Step 4 | Go to Auxiliary Blower Motor Malfunction |
| 4 | Does the auxiliary blower motor operate at the desired speed? | Go to Step 5 | Go to Auxiliary Blower Motor Malfunction |
| 5 | Place the auxiliary mode switch in each mode position. Does the air flow from the correct air distribution outlets in each selected mode position? |
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 6 |
| 6 |
|
Go to Step 7 | Go to Step 9 |
| 7 | Connect a test lamp between the auxiliary mode actuator supply voltage circuit and the low reference circuit of the auxiliary mode actuator. Does the test lamp illuminate? |
Go to Step 8 | Go to Step 10 |
| 8 |
|
Go to Step 12 | Go to Step 11 |
| 9 | Test the auxiliary mode actuator supply voltage circuit for an open, short to ground or high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 17 | Go to Step 14 |
| 10 | Test the low reference circuit of the auxiliary mode actuator for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 17 | Go to Step 14 |
| 11 | Test the auxiliary mode door control circuit for the following:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? |
Go to Step 17 | Go to Step 14 |
| 12 | Inspect the auxiliary mode door and the auxiliary mode actuator for the following conditions:
Did you find and correct the condition? |
Go to Step 17 | Go to Step 13 |
| 13 | Inspect for poor connections at the harness connector of the auxiliary mode actuator. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 17 | Go to Step 15 |
| 14 | 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
. Did you find and correct the condition? |
Go to Step 17 | Go to Step 16 |
| 15 | Replace the auxiliary mode actuator. Refer to Mode Actuator Replacement - Auxiliary . Did you complete the replacement? |
Go to Step 17 | - |
| 16 | Replace the auxiliary HVAC control module. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 17 | - |
| 17 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |