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DTC B1379: Ignition 3 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 3 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 CRUISE fuse (10-amp). See WIRING DIAGRAMS  . If fuse is blown, go to next step. If fuse is okay, go to step  7 .
  4. Connect test light between CRUISE 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 C1. Turn ignition on. If test light comes on, go to next step. If test light does not come on, go to step  11 .
  6. Turn ignition off. Disconnect cruise control module connector containing IGNITION 3 voltage signal. Turn ignition on. If test light comes on, go to step  9 . If test light does not come on, go to step  12 .
  7. Remove CRUISE fuse (10-amp) from right hand instrument panel junction block. Turn ignition on. With test light connected to ground, probe both terminals of CRUISE fuse. If test light comes on at one terminal, go to next step. If test light comes on at both terminals, go to step  10 .
  8. Check for open in IGNITION 3 voltage circuit (Brown wire). If faulty circuit is found and repaired, go to step  15 . If circuit is okay, go to step  13 .
  9. Repair short to ground in Brown wire. After repairs, go to step  15 .
  10. Repair open in ignition feed circuit to CRUISE fuse. After repairs, go to step  15 .
  11. Check for poor connections at BCM connector. If connector is repaired, go to step  15 . If connector is okay, go to step  13 .
  12. Check for poor connections at cruise control module connector. If connector is repaired, go to step  15 . If connector is okay, go to step  14 .
  13. Replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to step  15 .
  14. Replace cruise control module. See appropriate CRUISE CONTROL SYSTEMS article. After repairs, go to next step.
  15. Using scan tool, clear DTCs. Go to BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
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