Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Visually inspect the 30 Amp BLO fuse for an open. Is the fuse open? | -- | Go to Step 2 | Go to Step 3 |
2 | With the blower motor relay removed, test the fuse output-battery circuit for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | -- | Go to Step 4 | Go to Step 5 |
3 | Visually inspect the 10 Amp HVAC fuse for an open. Is the fuse open? | -- | Go to Step 8 | Go to Step 13 |
4 | Repair the short to ground in the fuse output-battery circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
5 | Test the blower motor feed circuit for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is a ground present? | -- | Go to Step 6 | Go to Step 7 |
6 | Repair short to ground in the blower motor feed circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
7 | Replace the 30Amp BLO fuse. Is the repair complete? | -- | System OK | -- |
8 | Test the fuse output-ignition circuit for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | -- | Go to Step 9 | Go to Step 10 |
9 | Repair short to ground in the fuse output-ignition circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
10 | Test the high speed blower relay feed-coil for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is a ground present? | -- | Go to Step 11 | Go to Step 12 |
11 | Repair short to ground in the high speed blower relay feed-coil. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
12 | Replace the 10 Amp HVAC fuse. Is the repair complete? | -- | System OK | -- |
13 | Test the fuse output-battery circuit for battery voltage at the relay. Refer to Circuit Testing in Wiring Systems. Is voltage present? | -- | Go to Step 14 | Go to Step 15 |
14 | Test the fuse output-ignition circuit for battery voltage at the hvac control assembly. Refer to Circuit Testing in Wiring Systems. Is voltage present? | -- | Go to Step 16 | Go to Step 17 |
15 | Repair open in the fuse output -battery circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
16 | Test the high speed blower relay feed-coil circuit for battery voltage at the HVAC control assembly. Refer to Circuit Testing in Wiring Systems. Is voltage present? | -- | Go to Step 18 | Go to Step 19 |
17 | Repair open in the fuse output-ignition circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
18 | Test the high speed blower relay feed-coil circuit for battery voltage at the relay. Refer to Circuit Testing in Wiring Systems. Is voltage present? | -- | Go to Step 20 | Go to Step 21 |
19 | Replace HVAC control assembly. Refer to Control Assembly Replacement in HVAC. Is the repair complete? | -- | System OK | -- |
20 | Test the relay ground circuit at relay for continuity to ground.Refer to Circuit Testing in Wiring Systems. Is ground present? | -- | Go to Step 22 | Go to Step 23 |
21 | Repair open in the high speed blower relay feed-coil circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
22 | With the mode selector and blower switch in the on position, test the blower motor feed circuit for battery voltage at the relay. Refer to Circuit Testing in Wiring Systems. Is voltage present? | -- | Go to Step 24 | Go to Step 25 |
23 | Repair open in the relay ground circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
24 | With the mode selector and blower switch in the high position, test the blower switch output-high circuit at the blower motor for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | -- | Go to Step 26 | Go to Step 27 |
25 | Replace the blower motor relay. Is the repair complete? | -- | System OK | -- |
26 | Replace the blower motor. Refer to Blower Motor and Fan Replacement in HVAC. Is the repair complete? | -- | System OK | -- |
27 | With the mode selector and blower switch in the high position, test the blower switch output-high circuit at the hvac control assembly for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | -- | Go to Step 28 | Go to Step 29 |
28 | Replace the hvac control assembly. Refer to Control Assembly Replacement in HVAC. Is the repair complete? | -- | System OK | -- |
29 | Repair open in the blower switch output-high circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 30 | Go to Step 31 |
30 | Test the ground circuit for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | -- | System OK | -- |
31 | Repair open in the ground circuit. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
