Was the entire HVAC System Check performed?

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Go to Step 2

Go to HVAC System Check

1. Turn the auxiliary blower switch to the REAR position.
2. Disconnect the auxiliary heater-A/C control connector C1.
3. Place the ignition switch in the RUN position.
4. Using a J 39200 , probe between the auxiliary heater-A/C control connector C1 terminal 4 and ground.
5. Move the temperature control knob from hot to cold, and then 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

Using a J 39200 , probe between the auxiliary heater-A/C control connector C1 terminal 1 and ground.

Is the measured voltage within the specified values?

9-14 V

Go to Step 5

Go to Step 6

Repair the poor connection or open in CKT 733 between S252 and the auxiliary heater-A/C control connector C1 terminal 4.

Is the repair complete?

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Go to Step 15

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Using a J 39200 , probe between the auxiliary heater-A/C control connector C1 terminal 6 and B+.

Is the measured voltage within the specified values?

9-14 V

Go to Step 8

Go to Step 7

Repair the poor connection or open in circuit 641 between the auxiliary heater-A/C control connector C1 terminal 1 and S345.

Is the repair complete?

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Go to Step 15

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Repair the open in CKT 850 between the auxiliary heater-A/C control connector C1 terminal 6 and S403.

Is the repair complete?

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Go to Step 15

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1. Check for a poor connection at the auxiliary heater-A/C control connector C1 terminal 5.
2. Check for a short to ground or voltage in CKT 955.
3. If OK, replace the auxiliary heater-A/C control. Refer to Control Assembly Replacement - Auxiliary in Side Trim Panel or Control Assembly Replacement - Auxiliary in Overhead Console .

Was replacement of the auxiliary heater-A/C control necessary?

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Go to Step 15

Go to Step 9

Repair the poor connection or short to ground in CKT 955.

Is the repair complete?

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Go to Step 10

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Using a J 39200 , probe between the temperature valve actuator connector terminal 10 and ground.

Is the measured voltage within the specified values?

9-14 V

Go to Step 11

Go to Step 12

Using a J 39200 , probe between the auxiliary temperature valve actuator connector terminal 7 and B+.

Is the voltage within the specified values?

9-14 V

Go to Step 13

Go to Step 14

Repair the poor connection or open in CKT 641 between the auxiliary temperature valve actuator connector terminal 10 and S345.

Is the repair complete?

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Go to Step 15

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Replace the auxiliary temperature valve actuator. Refer to Temperature Actuator Replacement - Auxiliary .

Is the repair complete?

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Go to Step 15

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Repair the open in CKT 850 between the auxiliary temperature valve actuator connector terminal 7 and S403.

Is the repair complete?

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Go to Step 15

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

Have all the repairs been made?

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Go to HVAC System Check

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