Step | Action | Yes | No |
|---|---|---|---|
1 | Did you review the HVAC Blower Controls Circuit Description and perform the necessary inspections? | Go to Step 2 | |
2 | Operate the blower motor at each speed. Does the blower motor operate at any speed? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Is battery voltage present? | Go to Step 12 | Go to Step 4 |
4 |
Is battery voltage present? | Go to Step 5 | Go to Step 6 |
5 | Repair the open in the BLU/WHT wire between the blower motor and the blower motor relay. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 20 | -- |
6 | Test for battery voltage at terminal 4 of the blower motor relay. Is battery voltage present? | Go to Step 8 | Go to Step 7 |
7 | Repair the open in the LT GRN wire between the blower motor relay and the blower fuse (in the junction block) OR in the RED wire between the blower fuse and the HTR fuse (in the fuse block). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 20 | -- |
8 |
Is battery voltage present? | Go to Step 10 | Go to Step 9 |
9 | Repair the open in the YEL/GRN wire between the blower motor relay and the DEF fuse (in the junction block). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 20 | -- |
10 | Test for an open in the BLK wire between the blower motor relay terminal 3 and G201. Was an open found? | Go to Step 19 | Go to Step 11 |
11 | Replace the blower motor relay. Refer to Blower Motor Relay Replacement . Is the repair complete? | Go to Step 20 | -- |
12 |
Is continuity present? | Go to Step 13 | Go to Step 14 |
13 | Replace the blower motor. Refer to Blower Motor and Fan Replacement . Is the repair complete? | Go to Step 20 | -- |
14 | Test for continuity between terminal 2 of the blower motor and terminal 3 of the blower motor resistor. Is continuity present? | Go to Step 16 | Go to Step 15 |
15 | Repair the open in the PNK wire between the blower motor and S204 (in the harness about 6 inches from the blower motor resistor connector). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 20 | -- |
16 |
Is continuity present? | Go to Step 17 | Go to Step 18 |
17 | Repair the open or high resistance in the BLK wire between the blower speed switch terminal 1 and G200. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 20 | -- |
18 | Replace the blower speed switch. Refer to Blower Switch Replacement . Is the repair complete? | Go to Step 20 | -- |
19 | Repair the open. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 20 | -- |
20 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
