Step | Action | Value(s) | 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 HVAC Diagnostic System Check? | -- | Go to Step 2 | |||||||||||
2 |
Does the scan tool indicate that the Rear HVAC parameter displays Disabled? | -- | Go to Step 3 | Go to Step 22 | ||||||||||
3 |
Does the scan tool indicate that the Rear HVAC parameter displays Enabled? | -- | Go to Step 4 | Go to Step 22 | ||||||||||
4 |
Does the power indicator of the auxiliary HVAC control module illuminate? | -- | Go to Step 5 | Go to Step 7 | ||||||||||
5 | Place the auxiliary mode switch in each position. Is the airflow sufficient from the correct auxiliary outlets in each mode? | -- | Go to Step 6 | Go to Step 11 | ||||||||||
6 | Place the front mode switch in the defrost position. Is there airflow from the auxiliary outlets? | -- | Go to Step 15 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | ||||||||||
7 |
Does the test lamp illuminate? | -- | Go to Step 8 | Go to Step 23 | ||||||||||
8 | Test the ground circuit of the auxiliary HVAC control module 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 28 | Go to Step 9 | ||||||||||
9 | Probe the auxiliary HVAC enable control circuit of the auxiliary HVAC control module with a test lamp that is connected to battery positive voltage. Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 21 | ||||||||||
10 | Test the auxiliary HVAC enable control circuit of the auxiliary HVAC control module 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 28 | Go to Step 22 | ||||||||||
11 |
Does the test lamp illuminate? | -- | Go to Step 12 | Go to Step 24 | ||||||||||
12 |
Does the voltage measure near the specified values? | 3-5 V FLOOR 7-9 V BI-LEVEL 11-13 V PANEL | Go to Step 13 | Go to Step 14 | ||||||||||
13 | Test the ground circuit of the auxiliary mode actuator 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 28 | Go to Step 19 | ||||||||||
14 | Test the auxiliary mode door control circuit of the auxiliary mode actuator for an open, a high resistance, a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 28 | Go to Step 21 | ||||||||||
15 | Does the power indicator illuminate on the auxiliary HVAC control module? | -- | Go to Step 16 | Go to Step 18 | ||||||||||
16 |
Does the voltage measure near the specified value? | B+ | Go to Step 21 | Go to Step 17 | ||||||||||
17 | Test the auxiliary HVAC enable control circuit of the auxiliary HVAC control module for an open or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 28 | Go to Step 22 | ||||||||||
18 |
Does the voltage measure near the specified value? | 0 V | Go to Step 19 | Go to Step 21 | ||||||||||
19 | Inspect the auxiliary mode door and the auxiliary mode actuator for the following :
Did you find and correct the condition? | -- | Go to Step 28 | Go to Step 20 | ||||||||||
20 | 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 28 | Go to Step 25 | ||||||||||
21 | 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 28 | Go to Step 26 | ||||||||||
22 | Inspect for poor connections at the harness connector of the 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 28 | Go to Step 27 | ||||||||||
23 | Repair the ignition 3 voltage circuit of the auxiliary HVAC control module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 28 | -- | ||||||||||
24 | Repair the ignition 3 voltage circuit of the auxiliary mode actuator. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 28 | -- | ||||||||||
25 | Replace the auxiliary mode actuator. Refer to Auxiliary Mode Valve Actuator Replacement . Did you complete the replacement? | -- | Go to Step 28 | -- | ||||||||||
26 | Replace the auxiliary HVAC control module. Refer to Auxiliary Heater and Air Conditioning Control Module Replacement . Did you complete the replacement? | -- | Go to Step 28 | -- | ||||||||||
27 | Replace the HVAC control module. Refer to HVAC Control Module Replacement . Did you complete the replacement? | -- | Go to Step 28 | -- | ||||||||||
28 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |