For 1990-2009 cars

## Blower Motor Inoperative in One Speed Only Front, High Speed Operates Normally

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the entire HVAC diagnostic system check performed? | -- | Go to Step 2 | Go to Diagnostic System Check
2 |

1. Disconnect the blower motor resistor connector.
2. Place the ignition switch in the RUN position.
3. Place the heater-A/C control in the inoperative position.
4. Connect a test lamp from the blower motor resistor connector inoperative terminal (1=B, 2=A, 3=D, 4=C) to ground on the harness connector. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 3

Go to Step 4

3 | Replace the blower motor resistor. Refer to Blower Motor Resistor Replacement . Is the repair complete? | -- | Go to Step 7 | --
4 | Probe with a test lamp between the heater-A/C control connector C1 of the inoperative terminal (1=H, 2=G, 3=F, 4=E) and ground. Refer to Circuit Testing in Wiring Systems. Is the test light on? | -- | Go to Step 5 | Go to Step 6
5 | Repair the poor connection or an open in the inoperative circuit (1=60, 2=63, 3=72, 4=73). Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 7 | --
6 | Replace the heater-A/C control. Refer to HVAC Module Assembly Replacement . Is the repair complete? | -- | Go to Step 7 | --
7 |

1. Turn the ignition switch to the OFF position.
2. Reconnect all connectors/components disconnected.

Have all repairs been made?

--

Go to Diagnostic System Check

--

## Blower Motor Inoperative in One Speed Only Rear, High Speed Operates Normally

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the entire HVAC diagnostic system check performed? | -- | Go to Step 2 | Go to Diagnostic System Check
2 | Is one speed inoperative from the auxilliary heater-A/C control (auxilliary blower switch) only? | -- | Go to Step 3 | Go to Step 4
3 |

1. Place the ignition switch in the RUN position.
2. Turn the rear window wiper/washer and multi-function switch to the rear position.
3. Place the auxilliary heater-A/C control (auxilliary blower switch) in the inoperative position.
4. Connect a test lamp from the auxiliary heater-A/C control connector C2 inoperative terminal (1=D, 2=E, 3=F) to B+. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 5

Go to Step 6

4 | Is one speed inoperative from the rear window wiper/washer and multi-fuction switch (auxilliary blower switch) only? | -- | Go to Step 7 | Go to Step 8
5 | Repair the poor connection or open in the inoperative circuit (1=1176, 2=1072, 3=1052). Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 11 | --
6 | Replace the auxiliary heater-A/C control. Refer to Auxiliary HVAC Module Replacement . Is the repair complete? | -- | Go to Step 11 | --
7 | Probe with a test lamp between the rear window wiper/washer and multi-function switch connector C2 of the inoperative terminal (1=A, 2=C, 3=B) and B+. Refer to Circuit Testing in Wiring Systems. Is the test lamp on? | -- | Go to Step 5 | Go to Step 9
8 |

1. One speed is inoperative from both switches.
2. Disconnect the auxiliary blower motor resistor connector.
3. Place the auxiliary blower switch in the inoperative position.
4. Connect a test lamp from the auxiliary blower motor resistor connector inoperative terminal (1=C, 2=D, 3=B) to B+. Refer to Circuit Testing in Wiring Systems.

Is the test lamp on?

--

Go to Step 10

Go to Step 5

9 | Replace the rear window wiper/washer and multi-function switch. Refer to Auxiliary Air Conditioning (A/C) Control Assembly Replacement - Front . Is the repair complete? | -- | Go to Step 11 | --
10 | Replace the auxiliary blower motor resistor. Refer to Auxiliary Blower Motor Resistor Replacement . Is the repair complete? | -- | Go to Step 11 | --
11 |

1. Turn the ignition switch to the OFF position.
2. Reconnect all connectors/components disconnected.

Have all repairs been made?

--

Go to Diagnostic System Check

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