The number(s) below refer to the step number(s) on the diagnostic table.
This step tests for auxiliary blower motor that does not operate from the front auxiliary HVAC control assembly regardless of the desired blower motor speed.
This step tests for a auxiliary blower motor that operates, yet does not accurately respond to the desired blower motor speed from the front auxiliary HVAC control assembly.
This step tests for auxiliary blower motor that does not operate from the rear auxiliary HVAC control assembly regardless of the desired blower motor speed.
This step tests for a auxiliary blower motor that operates, yet does not accurately respond to the desired blower motor speed from the rear auxiliary HVAC control assembly.
This step tests for an inoperative auxiliary mode actuator in one mode position(s) or in the wrong mode position(s) from either auxiliary HVAC control assemblies.
This step tests for an incorrectly installed auxiliary mode actuator, damaged attaching linkage(s). Any mechanical repairs will not require the auxiliary mode actuator to be replaced.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
Schematic Reference: HVAC Schematics DEFINITION: Air does not flow correctly from the auxiliary air distribution outlets. | ||||
1 | Did you review the HVAC operation and perform the necessary inspections? | -- | Go to Step 2 | |
2 |
Is the auxiliary blower motor OFF? | -- | Go to Step 3 | |
Place the front auxiliary control assembly blower control in each mode position. Does the auxiliary blower motor operate at all? | -- | Go to Step 4 | ||
Does the auxiliary blower motor operate correctly for each mode position? | -- | Go to Step 5 | ||
Does the auxiliary blower motor operate at all? | -- | Go to Step 6 | ||
Does the auxiliary blower motor operate correctly for each mode position? | -- | Go to Step 7 | ||
Do either auxiliary HVAC control assemblies operate correctly in any mode position? | -- | Go to Step 8 | Go to Step 23 | |
8 |
Does the auxiliary mode actuator operate correctly for each mode position? | -- | Go to Step 9 | Go to Step 10 |
9 |
Does the auxiliary mode actuator operate correctly for each mode position? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 12 |
10 | Test the ignition 3 voltage circuit of the front auxiliary HVAC control assembly for an open, or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 11 |
11 | Test the ignition 3 voltage circuit of the HVAC control processor - auxiliary for an open, or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 12 |
12 | Test the ignition 3 voltage circuit of the auxiliary mode actuator for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 13 |
13 | Test the ground circuit of the front auxiliary HVAC control assembly for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 14 |
14 | Test the ground circuit of the HVAC control processor - auxiliary for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 15 |
15 | Test the ground circuit of the auxiliary mode actuator for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 16 |
16 |
Does the voltage measure less than the specified value in each mode position? | 12 V | Go to Step 17 | Go to Step 20 |
17 | Does the voltage measure near the specified value in each mode position? | 0 V | Go to Step 21 | Go to Step 26 |
18 |
Does the voltage measure less than the specified value in each mode position? | 12 V | Go to Step 19 | Go to Step 22 |
19 | Does the voltage measure near the specified value in each mode position? | 0 V | Go to Step 23 | Go to Step 27 |
20 | Test the mode signal auxiliary front circuit 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 35 | Go to Step 26 |
21 | Test the mode signal auxiliary front circuit for an open, a high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 26 |
22 | Test the mode signal auxiliary rear circuit 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 35 | Go to Step 27 |
23 | Test the mode signal auxiliary rear circuit for an open, a high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 27 |
24 | Test the mode door control auxiliary circuit 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 35 | Go to Step 25 |
25 | Test the mode door control auxiliary circuit for an open, a high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 28 |
26 | Inspect for poor connections at the harness connector of the front auxiliary HVAC control assembly. 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 35 | Go to Step 31 |
27 | Inspect for poor connections at the harness connector of the rear auxiliary HVAC control assembly. 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 35 | Go to Step 32 |
28 | Inspect for poor connections at the harness connector of the HVAC control processor - auxiliary. 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 35 | Go to Step 33 |
29 | 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 30 |
Did you find and correct the condition? | -- | Go to Step 35 | Go to Step 34 | |
31 | Replace the front auxiliary HVAC control assembly . Refer to Auxiliary Heater and Air Conditioning Control Replacement - Front . Did you complete the replacement? | -- | Go to Step 35 | -- |
32 | Replace the HVAC control assembly - auxiliary rear. Refer to Auxiliary Heater and Air Conditioning Control Replacement - Front . Did you complete the replacement? | -- | Go to Step 35 | -- |
33 | Replace the HVAC control processor - auxiliary . Refer to Auxiliary HVAC Control Processor Replacement . Did you complete the replacement? | -- | Go to Step 35 | -- |
34 | Replace the mode actuator-auxiliary . Refer to Auxiliary Mode Valve Actuator Replacement . Did you complete the replacement? | -- | Go to Step 35 | -- |
35 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
The number(s) below refer to the step number(s) on the diagnostic table.
This step tests for a auxiliary blower motor that does not operate regardless of the desired blower motor speed.
This step tests for a auxiliary blower motor that operates, yet does not accurately respond to the desired blower motor speed.
This step tests for an inoperative auxiliary mode actuator in one mode position(s) or in the wrong mode position(s).
The front auxiliary HVAC control assembly mode switch control circuit will normally vary between 0-12 volts.
An incorrectly installed auxiliary mode actuator, damaged attaching linkage(s). Any mechanical repairs will not require the mode actuator-auxiliary to be replaced.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
Schematic Reference: HVAC Schematics DEFINITION: Air does not flow correctly from the auxiliary air distribution outlets. | ||||
1 | Did you review the HVAC operation and perform the necessary inspections? | -- | Go to Step 2 | |
2 |
Is the auxiliary blower motor OFF? | -- | Go to Step 3 | |
Place the front auxiliary HVAC control assembly blower control in each mode position. Does the auxiliary blower motor operate at all? | -- | Go to Step 4 | ||
Does the auxiliary blower motor operate correctly for each mode position? | -- | Go to Step 5 | ||
Does the auxiliary mode actuator operate correctly for each mode position? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 6 | |
6 | Test the ignition 3 voltage circuit of the front auxiliary HVAC control assembly for an open, a high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 7 |
7 | Test the ground circuit of the front auxiliary HVAC control assembly for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 8 |
8 | Test the ignition 3 voltage circuit of the auxiliary mode actuator for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 9 |
9 | Test the ground circuit of the auxiliary mode actuator for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 10 |
Does the voltage measure less than the specified value in each mode position? | 12 V | Go to Step 11 | Go to Step 12 | |
11 | Does the voltage measure near the specified value in each mode position? | 0 V | Go to Step 13 | Go to Step 15 |
12 | Test the auxiliary mode door control circuit 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 19 | Go to Step 14 |
13 | Test the auxiliary mode door control circuit for an open, a high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 14 |
14 | Inspect for poor connections at the harness connector of the front auxiliary HVAC control assembly. 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 19 | Go to Step 17 |
15 | 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 16 |
Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 18 | |
17 | Replace the front auxiliary HVAC control assembly . Refer to Auxiliary Heater and Air Conditioning Control Replacement - Front . Did you complete the replacement? | -- | Go to Step 19 | -- |
18 | Replace the mode actuator- auxiliary . Refer to Auxiliary Mode Valve Actuator Replacement . Did you complete the replacement? | -- | Go to Step 19 | -- |
19 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |