Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you review the HVAC operation and perform the necessary inspections? | -- | Go to Step 2 | |
2 | Exchange the blower motor relay with a known good relay from the underhood wiring harness junction block. Does the blower motor operate at high speed? | -- | Go to Step 3 | Go to Step 4 |
3 | Replace the faulty relay. Is the repair complete? | -- | System OK | -- |
4 |
Does the voltage measured equal the specified value? | battery positive voltage | Go to Step 7 | Go to Step 5 |
5 |
Does the voltage measured equal the specified value? | battery positive voltage | Go to Step 8 | Go to Step 6 |
6 | Replace the heater A/C control assembly. Refer to Control Assembly Replacement . Is the repair complete? | -- | System OK | -- |
7 | Using a test lamp, backprobe the underhood wiring harness junction block connector C3 between terminal D9 and terminal A10. Does the test lamp light? | -- | Go to Step 9 | Go to Step 10 |
8 | Repair the open in CKT 52 between the heater A/C control assembly and the underhood wiring harness junction block. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
9 | Replace the underhood wiring harness junction block. Refer to Underhood Fuse Block Replacement in Engine Electrical. Is the repair complete? | -- | System OK | -- |
10 | Repair the open in CKT 150 between the underhood wiring harness junction block and ground splice pack G201. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | -- |
