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DTC B1374: Ignition 1 Fault: Testing

WARNING: This page is about a different car, the 1999 Pontiac Grand Am and 1999 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS. Go to next step.
  2. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Observe IGNITION 1 input on BCM INPUTS data list. If scan tool indicates ACTIVE, go to DIAGNOSTIC AIDS  . If scan tool does not indicate ACTIVE, go to next step.
  3. Check condition of A/C BFC fuse (10-amp). See WIRING DIAGRAMS  . If fuse is blown, go to next step. If fuse is okay, go to step  6 .
  4. Connect test light between A/C BFC fuse (10-amp) terminals. Turn ignition on. If test light comes on, go to next step. If test light does not come on, go to DIAGNOSTIC AIDS  .
  5. Turn ignition off. Disconnect BCM connector C2. Turn ignition on. If test light comes on, go to step  8 . If test light does not come on, go to step  11 .
  6. Remove A/C BFC fuse (10-amp) from underhood junction block. Turn ignition on. With test light connected to ground, probe both terminals of A/C BFC fuse. If test light comes on at one terminal, go to next step. If test light comes on at both terminals, go to step  9 .
  7. Check for open in IGNITION 1 voltage circuit (Pink wire). If faulty circuit is found and repaired, go to step  12 . If circuit is okay, go to step  10 .
  8. Repair short to voltage in Pink wire between underhood junction block and BCM. After repairs, go to step  12 .
  9. Repair open in ignition feed circuit to A/C BFC fuse. After repairs, go to step  12 .
  10. Check for poor connections at BCM connector. If connector is repaired, go to step  12 . If connector is okay, go to next step.
  11. Replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  12. Using scan tool, clear DTCs. Go to BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
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