SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSPONTIAC1997GRAND PRIX GTP, 4D SEDANREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 7 (BODY CONTROL MODULE)DIAGNOSIS & REPAIRDTC U1300, CLASS 2 CIRCUIT (SHORT TO GROUND)TESTING
1997 Pontiac Grand Prix GTP, 4D Sedan

DTC U1300, Class 2 Circuit (Short To Ground): Testing

1997 Pontiac Grand Prix GTP, 4D SedanSECTION Testing
WARNING: This page is about a different car, the 1997 Buick Regal and 1997 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. If BCM diagnostic system check was performed, go to next step. If BCM diagnostic system check was not performed, go to BCM DIAGNOSTIC SYSTEM CHECK  .
  2. Turn ignition off. Disconnect splice pack SP205, located below instrument panel, by right side of steering column. Using test light, backprobe between battery voltage and splice pack SP205 harness terminal "A" (Purple wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 4).
  3. Repair short to ground in Purple wire between splice pack SP205 and Data Link Connector (DLC). Go to step 9).
  4. Using test light, backprobe between battery voltage and splice pack SP205 harness terminal "M" (Light Green wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 6).
  5. Leave test light connected as specified in step 4). Disconnect BCM 24-pin connector C2. If test light illuminates, go to step 7). If test light does not illuminate, go to step 8).
  6. Using test light, backprobe between battery voltage and splice pack SP205 harness terminal "L" (White wire). If test light illuminates, go to step 10). If test light does not illuminate, go to step 11).
  7. Repair short to ground in Light Green wire between BCM connector C2 and splice pack SP205. Go to step 9).
  8. Turn ignition off. Replace BCM. See REMOVAL & INSTALLATION  . Reprogram BCM. See BCM PROGRAMMING. Go to next step.
  9. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Using scan tool, clear DTCs. Perform BCM DIAGNOSTIC SYSTEM CHECK  .
  10. Leave scan tool connected as specified in step 6). Disconnect A/C-heater control 12-pin connector C2, located below center of instrument panel. If test light illuminates, go to step 12). If test light does not illuminate, go to step 13).
  11. Using test light, backprobe between battery voltage and splice pack SP205 harness terminal "G" (Gray wire). If test light illuminates, go to step 14). If test light does not illuminate, go to step 15).
  12. Repair short to ground in White wire between A/C-heater control and splice pack SP205. Go to step 9).
  13. Replace A/C-heater control. Go to step 9).
  14. Leave test light connected as specified in step 11). Disconnect IPC connector. If test light illuminates, go to step 16). If test light does not illuminate, go to step 17).
  15. Using test light, backprobe between battery voltage and splice pack SP205 harness terminal "E" (Light Blue wire). If test light illuminates, go to step 18). If test light does not illuminate, go to step 19).
  16. Repair short to ground in Gray wire between IPC and splice pack SP205. Go to step 9).
  17. Replace IPC. See appropriate INSTRUMENT PANEL article. Go to step 9).
  18. Leave test light connected as specified in step 15). Disconnect EBTCM connector C1, located below instrument panel, to left of steering column. If test light illuminates, go to step 20). If test light does not illuminate, go to step 21).
  19. Using test light, backprobe between battery voltage and splice pack SP205 harness terminal "B" (Dark Green wire). If test light illuminates, go to step 24). If test light does not illuminate, go to step 25).
  20. Repair short to ground in Light Blue wire between EBTCM connector C1 and splice pack SP205. Go to step 9).
  21. Replace EBTCM. See appropriate ANTI-LOCK BRAKES article in BRAKES section. Go to step 9).
  22. Repair short to ground in Dark Green wire between PCM connector C1 and splice pack SP205. Go to step 9).
  23. Replace PCM. Go to step 9).
  24. Disconnect PCM 80-pin Blue connector C1, located inside air cleaner assembly. Using test light, backprobe between battery voltage and splice pack SP205 harness terminal "B" (Dark Green wire). If test light illuminates, go to step 22). If test light does not illuminate, go to step 23).
  25. Turn ignition off. Reinstall all components and connectors. Clear DTCs. Check for DTCs. If DTC U1300 sets again, go to step 8). If DTC U1300 does not set again, system is operating properly.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.