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 rear auxiliary mode valve move and the air temperature change from hot to cold? | -- | Go to Testing for Intermittent Conditions and Poor Connections | 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 mode valve and seal assembly connector cavity 7 for CKT 150 (BLK) and ground. 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 J for CKT 733 (LT BLU) and ground. Refer to Circuit Testing in Wiring Systems. Does the circuit have continuity? | -- | Go to Step 13 | Go to Step 8 |
8 |
Does the circuit have continuity? | -- | Go to Step 14 | Go to Step 15 |
9 | Repair the open in CKT 341 (BRN) between splice S405 and the rear auxiliary mode valve and seal 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 mode valve and seal and splice S411. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | -- |
11 | Replace the rear auxiliary mode valve and seal assembly. Refer to Temperature Actuator Replacement - Auxiliary . Is the repair complete? | -- | Go to Step 16 | -- |
12 | Repair the short to voltage in CKT 733 (LT BLU) between the front auxiliary HVAC control module and the rear auxiliary mode valve and seal assembly. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | -- |
13 | Repair the short to ground in CKT 733 (LT BLU) between the front auxiliary HVAC control module and the rear auxiliary mode valve and seal assembly. Refer to Wiring Repairs in Wiring Systems. 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 733 (LT BLU) between the front HVAC control module and the rear auxiliary mode valve and seal assembly. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | -- |
16 | Operate the rear auxiliary HVAC systems in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
