For 1990-2009 cars

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

1. Place the ignition switch in the RUN position.
2. Using a J 39200 , probe between the heater-A/C control connector C2 terminal G and ground.
3. Move the temperature control knob from hot to cold, and cold to hot.

Does the measured voltage vary between approximately 1 and 12 volts?

1-12 V

Go to Step 3

Go to Step 4

3 |

1. Disconnect the electric slave actuator connector.
2. Using a J 39200 , probe between the electric slave actuator connector terminal 10 and ground.

Is the measured voltage within the specified values?

9-14 V

Go to Step 5

Go to Step 6

4 |

1. Check for a poor connection at the heater-A/C control connector C2 terminal G.
2. Check for a short to ground or voltage in CKT 733.
3. If OK, replace the heater-A/C control. Refer to Control Assembly Replacement .

Is the repair complete?

--

Go to Step 11

--

5 | Using a J 39200 , backprobe the electric slave actuator connector terminals 10 and 7. Is the measured voltage within the specified values? | 9-14 V | Go to Step 7 | Go to Step 8
6 | Repair the poor connection or open in CKT 241 between the electric slave actuator connector terminal 10 and S264. Is the repair complete? | -- | Go to Step 11 | --
7 | Using a J 39200 , backprobe the electric slave actuator connector terminal 8 and ground while moving the temperature control knob. Does the measured voltage vary between approximately 1 and 12 volts? | 1-12 V | Go to Step 9 | Go to Step 10
8 | Repair the poor connection or open in CKT 150 between the electric slave actuator connector terminal 7 and S213. Is the repair complete? | -- | Go to Step 11 | --
9 |

1. Check for a poor connection at the electric slave actuator or a binding air temperature valve.
2. If OK, replace the electric slave actuator. Refer to Temperature Actuator Replacement .

Is the repair complete?

--

Go to Step 11

--

10 | Repair the poor connection or open in CKT 733 between the electric slave actuator connector terminal 8 and the heater-A/C control connector C2 terminal G. Is the repair complete? | -- | Go to Step 11 | --
11 |

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

Have all the repairs been made?

--

Go to HVAC System Check

--