2010 Cadillac CTS Sedan AWD V6-3.6L Page 604
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC
control module.
5. Ignition ON, test for 4.8-5.2 volts between the following 5-volt reference circuit terminal and ground.
* Air temperature actuator-left terminal 2
* Air temperature actuator-right terminal 1
* Mode actuator terminal 1
* Recirculation actuator terminal 3
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the HVAC control module.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the HVAC
control module.
6. Verify the scan tool Door Position parameter is greater than 250 counts.
瀚慖f less than the specified range, test the following signal circuit for a short to ground. If the circuit tests normal, replace the HVAC control
module.
* Air temperature actuator-left terminal 3
* Air temperature actuator-right terminal 3
* Mode actuator terminal 3
* Recirculation actuator terminal 5
7. Install a 3A fused jumper wire between the following signal circuit terminal and the low reference circuit terminal. Verify the scan tool Door
Position parameter is less than 3 counts.
* Air temperature actuator-left terminal 3 and terminal 1
* Air temperature actuator-right terminal 3 and terminal 2
* Mode actuator terminal 3 and terminal 2
* Recirculation actuator terminal 5 and terminal 1
瀚慖f greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
replace the HVAC control module.
8. Ignition OFF, test for less than 10 ohms between the following control circuit terminal and ground.
* Air temperature actuator-left terminal 5
* Air temperature actuator-right terminal 5
* Mode actuator terminal 5
* Recirculation actuator terminal 6
瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace
the HVAC control module.
9. Ignition OFF, test for less than 10 ohms between the following control circuit terminal and ground.
* Air temperature actuator-left terminal 4
* Air temperature actuator-right terminal 4
* Mode actuator terminal 4
* Recirculation actuator terminal 7
瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace
the HVAC control module.
10. Connect a test lamp between following control circuit terminals.
* Air temperature actuator-left terminal 5 and terminal 4
* Air temperature actuator-right terminal 5 and terminal 4
* Mode actuator terminal 5 and terminal 4
* Recirculation actuator terminal 6 and terminal 7
11. Ignition ON, command the appropriate actuator door in both directions with a scan tool. The test lamp should turn ON and OFF when
commanded in both directions.
瀚慖f the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal,
replace the HVAC control module.
