Auxiliary Blower Motor Malfunction 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 operates in at least one speed position from at least one auxiliary control. | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool indicate that the Driver Override Switch parameter changes state? | Go to Step 6 | Go to Step 3 | |
3 | Test the auxiliary HVAC enable control circuit of the front auxiliary blower motor switch for an open, short to voltage or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 4 | |
4 | Test the low reference circuit of the front auxiliary blower motor switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 5 | |
5 |
Does the volt meter read properly for each position? | Rear 5.0 V Off-1.0 V Pos.1 2.0 V Pos.2 3.0 V Pos.3 4.0 V | Go to Step 16 | Go to Step 17 |
6 |
Important: Ensure that the front auxiliary blower control switch is in the REAR position during the remainder of this table in order to avoid misdiagnosis.
Does the scan tool indicate that the Rear Fan Up Button parameter changes state? | -- | Go to Step 7 | Go to Step 16 |
7 |
Does the scan tool indicate that the Rear HVAC Fan Down Switch parameter changes state? | -- | Go to Step 8 | Go to Step 16 |
8 | Place the auxiliary blower motor switch in each speed position. Does the auxiliary blower motor operate at the desired speeds? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 9 |
9 |
Does the test lamp illuminate and increase intensity? | -- | Go to Step 14 | Go to Step 10 |
10 | Test the battery positive voltage circuit of the auxiliary blower motor control processor for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 22 | Go to Step 11 |
11 | Test the ground circuit of the auxiliary blower motor control processor for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 22 | Go to Step 12 |
12 |
Important: Ensure that the auxiliary blower motor control processor and auxiliary HVAC control module connectors are connected during this step in order to avoid misdiagnosis.
Does the voltage continually decrease within the specified range? | 13.0-1.5 V | Go to Step 15 | Go to Step 13 |
13 |
Does the voltage measure near the specified value? | 8-12.5 V | Go to Step 16 | Go to Step 15 |
14 | 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 22 | Go to Step 19 |
15 | 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 22 | Go to Step 20 |
16 | 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 22 | Go to Step 21 |
17 | Inspect for poor connections at the harness connector of the front auxiliary blower motor switch. 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 22 | Go to Step 18 | |
18 | Replace the front auxiliary blower motor switch. Refer to Front Auxiliary Blower Motor Switch Replacement . Did you complete the replacement? | Go to Step 22 | -- | |
19 | 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 22 | -- |
20 | Replace the auxiliary blower motor control processor. Refer to Auxiliary Blower Motor Processor Replacement . Did you complete the replacement? | -- | Go to Step 22 | -- |
21 | Replace the auxiliary HVAC control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 22 | -- |
22 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
Auxiliary Blower Motor Malfunction Body Type VIN 3
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 |
