For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Remove the heater and A/C control unit.
2. Disconnect connector C1 from the heater and A/C control unit.
3. Remove the connector from the blower control module.
4. Test CKT FP812 (BLK/BLU) for a short to voltage. (Turn ON the ignition, leaving the engine OFF, when testing for a short to voltage.)

Did you find a short to voltage on CKT FP812?

--

Go to Step 2

Go to Step 3

2 | Repair the short to voltage on CKT FP812 (BLK/BLU). Did you complete the repair? | -- | Go to Step 4 | --
3 | Disconnect the blower motor ground (BRN wire) from the blower control module. Did the blower motor stop operating? | -- | Go to Step 5 | Go to Step 7
4 |

1. Reassemble any connectors/components removed in previous steps.
2. Turn the ignition switch to the ON position.
3. Select AUTO mode on the heater & A/C control.
4. Cycle through all the blower speeds.

Do all the blower speeds operate properly?

--

System OK

Go to Step 6

5 | Replace the blower control module. Did you complete the replacement? | -- | Go to Step 4 | --
6 | Replace the heater & A/C control. Refer to Control Assembly Replacement . Did you complete the replacement? | -- | Go to Step 8 | --
7 | Replace the blower motor. Refer to Blower Motor and Fan Replacement in HVAC. Did you complete the replacement? | -- | Go to Step 8 | --
8 | Operate the system for which the symptom occurred. Is the symptom still present? | -- | -- | System OK