Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you review the HVAC air delivery operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms |
2 |
Does the air temperature from the rear auxiliary HVAC unit change from cold to hot? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp light? | -- | Go to Step 4 | Go to Step 9 |
4 | Connect a J 39200 digital multimeter (DMM) between rear auxiliary temperature valve assembly connector cavity 7 for CKT 150 (BLK) and ground. Refer to Circuit Testing in Wiring Systems. Refer to Circuit Testing in Wiring Systems. Does the circuit have continuity? | -- | Go to Step 5 | Go to Step 10 |
5 |
Is voltage indicated and does the voltage vary? | -- | Go to Step 11 | Go to Step 6 |
6 |
Does the test lamp light? | -- | Go to Step 12 | Go to Step 7 |
7 | Connect a J 39200 DMM between front auxiliary HVAC control module connector cavity B for CKT 734 and ground. Refer to Circuit Testing in Wiring Systems. Is continuity present? | -- | Go to Step 13 | Go to Step 8 |
8 |
Is continuity present? | -- | Go to Step 14 | Go to Step 15 |
9 | Repair the open in CKT 341 (BRN) between splice S405 and the rear auxiliary temperature valve assembly. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | -- |
10 | Repair the open in CKT 150 (BLK) between the rear auxiliary temperature valve and splice S411. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | -- |
11 | Replace the rear auxiliary temperature valve assembly. Refer to Temperature Actuator Replacement - Auxiliary Does the rear the auxiliary temperature valve operate? | -- | Go to Step 16 | -- |
12 | Repair the short to voltage in CKT 734 (DK GRN) between the front auxiliary HVAC control module and the rear auxiliary temperature valve assembly. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | -- |
13 | Repair the short to ground in CKT 734 (DK GRN) between the front auxiliary HVAC control module and the rear auxiliary temperature valve assembly. Refer to Wiring Repairs Is the repair complete? | -- | Go to Step 16 | -- |
14 | Replace the front auxiliary HVAC control module. Refer to Auxiliary Air Conditioning (A/C) Control Assembly Replacement - Front . Is the repair complete? | -- | Go to Step 16 | -- |
15 | Repair the open in CKT 734 (DK GRN) between the front auxiliary HVAC control module and the rear auxiliary temperature valve assembly. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | -- |
16 | Operate the rear auxiliary HVAC system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
