Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you review the HVAC operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms |
2 |
Does the test lamp illuminate? | -- | Go to Step 3 | Go to Step 4 |
3 | Inspect for a poor connection at the rear heater resistor pack. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Does a poor connection exist? | -- | Go to Step 9 | Go to Step 5 |
4 | Using a test lamp backprobe from the rear heater switch CKT 1925 (RED) cavity B to ground. Does the test lamp illuminate? | -- | Go to Step 6 | Go to Step 7 |
5 | Replace the rear heater resistor pack. Refer to Auxiliary Blower Motor Resistor Replacement in Heating, Ventilation, and Air Conditioning. Did you complete the replacement? | -- | Go to Step 10 | -- |
6 | Repair the open in CKT 1925 (RED). Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 10 | -- |
7 | Inspect for a poor connection at the rear heater switch. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Did you find a poor connection? | -- | Go to Step 9 | Go to Step 8 |
8 | Replace the rear heater switch. Refer to Control Switch Replacement - Auxiliary in Heating, Ventilation, and Air Conditioning. Did you complete the replacement? | -- | Go to Step 10 | -- |
9 | Repair the poor connection. Refer to Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 10 | -- |
10 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
