For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the HVAC Blower Controls System Check? | -- | Go to Step 2 | Go to HVAC Blower Controls System Check
2 | Replace the blower motor relay with a known good relay. Does the blower motor operate correctly? | -- | Go to Step 3 | Go to Step 4
3 | Replace the blower motor relay. Is the repair complete? | -- | Go to HVAC Blower Controls System Check | --
4 |

1. Turn the ignition to the OFF position.
2. Disconnect the blower motor connector.
3. Use a test lamp in order to backprobe the underhood wiring harness junction block connector C3 between terminal D9 and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5 | Repair the short to battery positive in CKT 52 between the heater A/C control assembly connector C1 terminal C and the underhood wiring harness junction block connector C3 terminal D9. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to HVAC Blower Controls System Check | --
6 |

1. Remove the blower motor relay.
2. Disconnect the underhood wiring harness junction block connector C3.
3. Use a test lamp connected to ground in order to probe the underhood wiring harness junction block relay cavity 30 (CKT 65).

Does the test lamp light?

--

Go to Step 7

Go to Step 8

7 | Replace the underhood wiring harness junction block. Is the repair complete? | -- | Go to HVAC Blower Controls System Check | --
8 |

1. Reconnect the underhood wiring harness junction block connector C3.
2. Disconnect the blower motor connector.
3. Use a test lamp connected to ground in order to backprobe the blower motor connector terminal B.

Does the test lamp light?

--

Go to Step 9

Go to Step 10

9 | Repair the short to positive battery voltage in CKT 65 between the underhood wiring harness junction block and the blower motor connector. Is the repair complete? | -- | Go to HVAC Blower Controls System Check | --
10 | Replace the heater A/C control assembly. Refer to Control Assembly Replacement . Is the repair complete? | -- | Go to HVAC Blower Controls System Check | --