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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESBODY CONTROL MODULESDIAGNOSTIC TESTSDTC B1372: IGNITION 1 CIRCUIT LOWTESTING
2001 Chevrolet Cavalier LS, 2.4 T

DTC B1372: Ignition 1 Circuit Low: Testing

2001 Chevrolet Cavalier LS, 2.4 TSECTION Testing
  1. If Body Control Module (BCM) diagnostic system check has been performed, go to next step. If BCM diagnostic system check has not been performed, go to BODY CONTROL SYSTEM DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located at lower left side of instrument panel, near steering column. Turn ignition switch to RUN position. Observe IGNITION "1" input parameter on BCM data list. If scan tool does not indicate ON, go to next step. If scan tool indicates ON, perform this step while wiggling Pink wire between instrument panel fuse block and BCM, and BCM Brown harness connector C3. This can often cause malfunction to appear. Repair as necessary.
  3. Remove and check BCM/CLU fuse (10-amp) from instrument panel fuse block. See Figure . Instrument panel fuse block is located on left side of instrument panel. If fuse is blown, go to next step. If fuse is okay, go to step  7 .
  4. Connect test light between BCM/CLU fuse cavities. Turn ignition switch to RUN position. If test light illuminates, go to next step. If test light does not illuminate, perform this step while wiggling Brown wire between ignition switch and BCM/CLU fuse in instrument panel fuse block, and ignition switch harness connector. This can often cause malfunction to appear. Repair as necessary.
  5. Turn ignition switch to LOCK position. Disconnect Body Control Module (BCM) 24-pin Brown harness connector C3. BCM is located behind left side of instrument panel. Turn ignition switch to RUN position. Connect test light between BCM/CLU fuse cavities. If test light illuminates, go to next step. If test light does not illuminate, go to step  11 .
  6. Turn ignition switch to LOCK position. Disconnect Instrument Panel Cluster (IPC) 12-pin harness connector, located behind center of instrument cluster. Turn ignition switch to RUN position. Connect test light between BCM/CLU fuse cavities. If test light illuminates, go to step  9 . If test light does not illuminate, go to step  12 .
  7. Turn ignition switch to RUN position. With test light connected to ground, probe both BCM/CLU fuse cavities. If test light illuminates at one cavity, go to next step. If test light does not illuminate at one cavity, go to step  10 .
  8. Turn ignition switch to LOCK position. Check continuity in Pink wire between BCM/CLU fuse cavity and BCM harness connector C3 terminal A12. See Figure . If continuity exists, go to step  13 . If continuity does not exist, repair open in Pink wire between instrument panel fuse block and BCM. After repairs, go to step  15 .
  9. Repair short to ground in Pink wire between instrument panel fuse block and BCM harness connector C3 terminal A12. After repairs, go to step  15 .
  10. Repair open in Pink wire between ignition switch harness connector C2 terminal "A" and BCM/CLU fuse. See POWER DISTRIBUTION article in WIRING DIAGRAMS. For 2002, see POWER DISTRIBUTION article in WIRING DIAGRAMS. After repairs, go to step  15 .
  11. Check for poor connections at BCM harness connector C3. If BCM harness connector C3 is okay, go to step  13 . If problem is found, repair as necessary. After repair, go to step  15 .
  12. Check for poor connections at IPC harness connector. If IPC harness connector is okay, go to step  14 . If problem is found, repair as necessary. After repair, go to step  15 .
  13. Replace BCM. See REMOVAL & INSTALLATION  . Program BCM. See BODY CONTROL MODULE PROGRAMMING/REGULAR PRODUCTION OPTION CONFIGURATION  under PROGRAMMING. After repairs, go to step  15 .
  14. Replace instrument cluster. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs, go to next step.
  15. Using scan tool, clear DTCs. Turn ignition switch to OFF position, then start engine. Wait at least 30 seconds, and retrieve DTCs. If DTC B1372 exists, go to step  2 . If DTC B1372 does not exist, system is okay at this time.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.