For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Blower Controls System Check performed? | -- | Go to Step 2 | Go to HVAC Blower Controls System Check
2 | Inspect the HEATER BLOWER fuse. Is the fuse open? | -- | Go to Step 3 | Go to Step 4
3 | Test the battery feed circuit to the blower control module (CKT A465) for a short to ground. Refer to Testing for Short to Ground in Wiring Systems. Did you find a short to ground in the battery feed circuit? | -- | Go to Step 5 | Go to Step 6
4 | Remove the HEATER BLOWER fuse and test for voltage at the fuse block terminal (one terminal is hot at all times). Is the voltage within the specified value? | 11 - 13 V | Go to Step 7 | Go to Step 8
5 |

1. Repair the short to ground. Refer to Wiring Repairs in Wiring Systems.
2. Replace the HEATER BLOWER fuse.

Is the repair complete?

--

Go to Step 16

--

6 | The short to ground may be intermittent at this time. Refer to Testing for Electrical Intermittents in Wiring Systems. Replace the HEATER BLOWER fuse. Did you replace the fuse? | -- | Go to HVAC Blower Controls System Check | --
7 |

1. Reinstall the HEATER BLOWER fuse.
2. Remove the blower control module.
3. Connect the negative lead of the DMM to terminal 3 of the blower control module.
4. With the positive lead measure the voltage at terminal 1 of the blower control module.

Is the voltage within the specified value?

11 - 13 V

Go to Step 9

Go to Step 10

8 | Locate and repair an open to the HEATER BLOWER fuse battery feed circuit (CKT A60). Refer to Testing for Continuity in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | --
9 | Measure the voltage at terminal 6 (motor+). Is the voltage within the specified value? | 11 - 13 V | Go to Step 11 | Go to Step 12
10 |

1. Move the negative lead of the DMM to another ground location.
2. Re-measure the voltage at terminal 1.

Is the voltage within the specified value?

11 - 13 V

Go to Step 13

Go to Step 14

11 |

1. Disconnect the blower motor ground (BRN wire) from the blower control module.
2. Connect a fused jumper wire between the BRN wire and ground.
3. Turn the ignition switch to the ON position.

Does the blower motor operate?

--

Go to Step 12

Go to Step 15

12 | Replace the blower control module. Is the replacement complete? | -- | Go to Step 16 | --
13 | Locate and repair the open in CKT F812 (BLK). Is the repair complete? | -- | Go to Step 16 | --
14 | Locate and repair the open in CKT A465 (RED). Is the repair complete? | -- | Go to Step 16 | --
15 | Replace the blower motor. Is the replacement complete? | -- | Go to Step 16 | --
16 | Operate the system for which the symptom occurred. Is the symptom still present? | -- | -- | System OK