SAAB WIS ONLINE

AIR MIX DOOR ACTUATOR

AIR MIX DOOR ACTUATOR

TROUBLE SYMPTOM:

Outlet air temperature is not changed.

WIRING DIAGRAM:


CHECK POWER SUPPLY FOR AUTO A/C CONTROL MODULE SIDE.

Turn the ignition switch to ON.

Turn the A/C switch to ON.

Measure the voltage between auto A/C control module harness connector terminal and chassis ground.

Connector & terminal

(B283) No. 5 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes


No

Replace the auto A/C control module.


CHECK POWER SUPPLY FOR ACTUATOR SIDE.

Measure the voltage between air mix door actuator harness connector terminal and chassis ground.

Connector & terminal

(B293) No. 1 (+) — Chassis ground (−):

Is the voltage more than 10 V?

Yes


No

Repair the open circuit in harness between auto A/C control module and air mix door actuator.


CHECK SIGNAL FOR AUTO A/C CONTROL MODULE SIDE.

Measure the voltage between auto A/C control module harness connector terminal and chassis ground with oscilloscope.

Connector & terminal

(B282) No. 4 (+) — Chassis ground (−):

Is the voltage approx. 5.5 V?

Yes


No

Replace the auto A/C control module.


CHECK SIGNAL FOR ACTUATOR SIDE.

Measure the voltage between air mix door actuator harness connector terminal and chassis ground with oscilloscope.

Connector & terminal

(B293) No. 3 (+) — Chassis ground (−):

Is the voltage approx. 5.5 V?

Yes


No

Repair the open circuit in harness between auto A/C control module and air mix door actuator.


CHECK GROUND CIRCUIT OF ACTUATOR.

Turn the ignition switch and A/C switch to OFF.

Measure the resistance between air mix door actuator harness connector terminal and chassis ground.

Connector & terminal

(B293) No. 2 — Chassis ground:

Is the resistance less than 1 Ω?

Yes


No

Repair the open circuit in harness between air mix door actuator and chassis ground.


CHECK POOR CONTACT IN AUTO A/C CONTROL MODULE CONNECTOR.

Check poor contact in auto A/C control module connector.

Is there poor contact in connector?

Yes

Repair the connector.


No

Replace the auto A/C control module.