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Home >> Cadillac >> 1998 >> Seville SLS >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Module >> Diagnosis & Testing >> DTC B1344: HTR/Def/Ac Door Movement Fault >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform BCM diagnostic system check. See BCM DIAGNOSTIC SYSTEM CHECK  . After performing system check, go to next step.
  2. Start and warm engine to normal operating temperature. Using scan tool, establish communications with IPM. Recalibrate all actuators. If difference between minimum and maximum counts is 150-220 counts, go to next step. If difference between minimum and maximum counts is not 150-220, go to step 4).
  3. Clear all DTCs using scan tool. Operate system. If system operates normally, go to step 18). if system does not operate normally, go to next step.
  4. Disconnect actuator harness connector. Using DVOM, check voltage between ground and actuator harness connector terminal No. 10 (Gray wire). See WIRING DIAGRAMS  . If voltage reading is 5 volts, go to next step. If voltage reading is not 5 volts, go to step 9).
  5. Check voltage between ground and actuator harness connector terminal No. 5 (Brown wire). If voltage reading is 5 volts, go to next step. If voltage reading is not 5 volts, go to step 9).
  6. Check voltage between ground and actuator harness connector terminal No. 7 (Yellow wire). If voltage reading is zero volts, go to next step. If voltage reading is not zero volts, go to step 9).
  7. Check voltage between ground and actuator harness connector terminal No. 6 (Yellow wire). If voltage reading is 2.5 volts, go to next step. If voltage reading is not 2.5 volts, go to step 9).
  8. Check voltage between ground and actuator harness connector terminal No. 9 (Yellow/Black wire). If voltage reading is 5 volts, go to next step. If voltage reading is not 5 volts, go to step 9).
  9. Check for open or short in circuits. If circuits are faulty, go to next step. If circuits are okay, go to step 11).
  10. Repair open or short in circuit. After repairs, go to step 21).
  11. Using scan tool, view actuator data. If actuator data displayed is 5 volts or 255 counts, go to next step. If actuator data displayed is not 5 volts or 255 counts, go to step 20).
  12. Connect a jumper wire between ground and actuator harness connector terminal No. 9 (Yellow/Black wire). Using scan tool, view actuator data. If actuator data is zero volts or zero count, go to next step. If actuator data is not zero volts or zero count, go to step 20).
  13. Reconnect harness connector to actuator. Using scan tool, view actuator data. If actuator data is zero or 255 counts, go to step 20). If actuator data is not zero or 255 counts, go to next step.
  14. Using scan tool, move actuator to hot and cold positions. If actuator moves to both directions, go to next step. If actuator does not move to both directions, go to step 16).
  15. If actuator actual position feedback changed, go to step 21). If actuator actual position feedback does not change, go to step 19).
  16. Disconnect actuator harness connector. Jumper harness connector terminals No. 6 (Yellow wire) and No. 10 (Gray wire). If actuator moves, go to next step. If actuator does not move, go to step 18).
  17. If actual actuator position feedback changed, go to step 21). If actual actuator position feedback did not change, go to step 19).
  18. Using a jumper wire, jumper actuator harness connector terminals No. 6 (Yellow wire) and No. 7 (Yellow wire). If actuator moved, go to step 17). If actuator did not move, go to next step.
  19. Replace actuator. After replacing actuator, go to step 21).
  20. Replace IPM. After replacing IPM, go to next step.
  21. Verify system operation.
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