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Home >> Saab >> 2003 >> 9-3 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Automatic A/C-Heater Systems) >> Diagnostic Tests >> DTC B1347: Mixed-Air Temperature Sensor >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2001 Saab 9-3 and 2000 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Connect scan tool to Data Link Connector (DLC) located under steering column. Using scan tool, contact ACC control module and check for DTC B2945. If DTC B2945 is not displayed, go to next step. If DTC B2945 is displayed, go to DTC B2945: SENSOR GROUND  .
  2. Disconnect 10-pin connector located on passenger-side of climate control unit. Connect a test light between battery voltage and harness side of 10-pin connector terminal No. 9 (Blue/Red wire on 2000 models; Red/Blue wire on 2001 models). See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, repair wire (Blue/Red on 2000 models; Red/Blue on 2001 models) between 10-pin connector and ACC control module 39-pin connector terminal No. 38. See Figure . When repairs are complete, go to step  5 .
  3. Turn ignition on. Using scan tool, contact ACC control module and read mixed-air temperature sensor value. With 10-pin disconnected sensor value should be 4.7-5.0 volts. If sensor value is as specified, go to next step. If sensor value is not as specified, repair open in Violet wire between 10-pin connector terminal No. 10 and ACC control module 39-pin connector terminal No. 19. When repairs are complete, go to step  5 .
  4. Connect a fused jumper wire between harness side of 10-pin connector terminals No. 9 (Blue/Red wire on 2000 models; Red/Blue wire on 2001 models) and No. 10 (Violet wire). Using scan tool, contact ACC control module and read mixed-air temperature sensor value. If sensor value is zero volts, replace mixed-air temperature sensor. If sensor value is not zero volts, repair short in Violet wire between 10-pin connector terminal No. 10 and ACC control module 39-pin connector terminal No. 19. When repairs are complete, go to next step.
  5. Using scan tool, clear all DTCs from all systems. Recheck A/C system operation for original complaint. If A/C system is operating properly and no DTC has been detected, repair is complete. If a DTC has been detected, a control module may need to be replaced. See CONTROL MODULES  under COMPONENT TESTS.
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