Auxiliary Blower Motor Inoperative Body Type VIN 6
Step | Action | Values | 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 from both the front and rear controls. | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the auxiliary blower motor operate in any of the speed positions? | Go to Step 3 | ||
3 |
Does the auxiliary blower motor operate in any of the speed positions? | -- | Go to Step 4 | |
4 |
Does the scan tool indicate that the Driver Override Switch parameter changes state? | -- | Go to Step 5 | Go to Step 6 |
5 |
Does the test lamp illuminate? | -- | Go to Step 12 | Go to Step 7 |
6 | Test the auxiliary HVAC enable control circuit of the front auxiliary blower motor switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 14 |
7 | Test the battery positive voltage circuit of the auxiliary blower motor control processor for an open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairsin Wiring Systems. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 8 |
8 | Test the ground circuit of the auxiliary blower motor control processor 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 18 | Go to Step 9 |
9 |
Important: Ensure that the auxiliary blower motor control processor connector and the auxiliary HVAC control module connectors are connected during this step in order to avoid misdiagnosis.
Does the voltage measure near the specified value? | Low 6 V Med 4 V High 2.5 V Off Battery Voltage | Go to Step 10 | Go to Step 11 |
10 | Test the auxiliary blower motor speed control circuit of the auxiliary HVAC control module for an open or a short to voltage. Refer to Circuit Testing and Wiring Repairsin Wiring Systems. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 13 |
11 | Test the auxiliary blower motor speed control circuit of the auxiliary HVAC control module for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 14 |
12 | 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 18 | Go to Step 15 |
13 | Inspect for poor connections at the harness connector of the auxiliary blower motor control processor. 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 18 | Go to Step 16 |
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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 17 |
15 | 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 18 | -- |
16 | Replace the auxiliary blower motor control processor. Refer to Auxiliary Blower Motor Processor Replacement. Did you complete the replacement? | -- | Go to Step 18 | -- |
17 |
Important: Perform the recalibration procedure for the auxiliary HVAC control module. Replace the auxiliary HVAC control module. Refer to Auxiliary Heater and Air Conditioning Control Module Replacement. Did you complete the replacement? | -- | Go to Step 18 | -- |
18 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
