From VIN S5220000

Circuit Testing:

Step 1: Check fuses
1. Check the HEATER and WIPER fuses.
2. If a fuse is open, check for a short-circuit in the wiring harness before replacing it.
3. If the fuses are OK, go to step 2.

Circuit Testing:

Step 2: Check voltage at blower motor
1. Turn the ignition switch ON.
2. Turn the blower switch to HI.
3. Measure the voltage at the following pin of the blower motor connector, C253.

Circuit Testing:

Step 3: Check voltage at blower motor resistor assembly
1. Turn the ignition switch ON.
2. Turn the blower switch OFF and verify that the A/C switch is OFF.
3. Measure the voltage at the following pins of the resistor assembly, connector C262.

Circuit Testing:

Step 4: Check voltage at blower switch
1. Turn the ignition switch ON.
2. Turn the blower switch to OFF.
3. Measure the voltage at the following pins of the blower switch connector, C263.

Circuit Testing:

Step 5: Check ground at blower switch
4. Turn blower switch to OFF.
5. Use ohmmeter to check continuity from ground to indicated pin of blower switch connector C263.

Circuit Testing:

Step 6: Check voltage at blower switch
1. Turn the ignition switch ON.
2. Turn the blower switch to indicated position and A/C switch to OFF.
3. Measure the voltage between pin 1 of C253 and the following pins of blower switch connector C263.

Circuit Testing:

Step 7: Check voltage at fresh/recirculate actuator
1. Turn ignition to ON.
2. Set fresh/recirculate (F/R) switch to position indicated.
3. Measure the voltage at the following pins in the fresh/recirculate circuit.
4. If fresh/recirculate actuator does not work after above checks, replace it.

Circuit Testing-Fresh/Recirculate Actuator:

Fresh/Recirculate Actuator
1. Check continuity between terminals of the actuator.
2. If not as specified, replace actuator.
3. Proceed to step 8.

Circuit Testing:

Step 8: Check ground at fresh/recirculate switch
1. Turn ignition switch to OFF.
2. Disconnect C283.
3. Use ohmmeter to check continuity between ground and indicated pin of temperature control connector C283.

Circuit Testing:

Step 9: Check voltage at fresh/recirculate switch
1. Turn ignition switch to ON.
2. Set Fresh/Recirculate (F/R) switch to position indicated.
3. Measure the voltage between pin 2 of C240 and the following pins of the fresh/recirculate switch connector C282.

Circuit Testing-Fresh/Recirculate Switch:

Fresh/Recirculate Switch
1. Check continuity between pins of the switch connector.
2. If not as specified, replace switch.
3. Proceed to step 10.

Circuit Testing:

Step 10: Troubleshooting Temperature Control and Air Mix actuator